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[Display omitted] • A spongy MT-Ag 2 S/cellulose acetate photothermal membrane is synthesized. • The photothermal membrane possesses anti-pollution and self-cleaning performance. • The efficient seawater desalination and water purification process is analyzed. • A device for sustainable desalination, water purification and clean water collection is designed and applied in practice. Solar-driven interfacial evaporation (SIE) technology stands out as a promising approach for seawater desalination, leveraging solar energy efficiently in an environmentally friendly manner. However, the enrichment of organic pollutants on the interfacial evaporator has posed significant obstacles to the sustained implementation of SIE. Herein, a spongy, anti-pollution cellulose acetate membrane consisting of Ag 2 S-doping MXene nanosheets (MT-Ag 2 S/CAM) is proposed for sustainable desalination. The MT-Ag 2 S/CAM exhibited ultralow water vaporization enthalpy of 1.50 kJ g−1. Meanwhile, the MT-Ag 2 S/CAM, featured by high porosity (75.25 %), excellent light absorption and salt resistance, demonstrated a notable solar-driven evaporation rate of 1.8 kg m−2h−1 and a remarkable photothermal conversation efficiency of 91.6 % under one sun irradiation. Meanwhile, MT-Ag 2 S/CAM can realize a removal efficiency of 93.3 % for methylene blue, exhibiting outstanding anti-pollution and self-cleaning capabilities as well as long-term stability due to its strong mechanical properties. Finally, a device for sustainable desalination, water purification and clean water collection is designed and implemented in a practical SIE process. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • High active visible CDs-N-TiO 2-x catalyst was facile fabricated for the first time. • The successful introduction of CDs, N and Ti3+/O v in the composite was confirmed. • CDs-N-TiO 2-x was applied to the efficient reduction of Cr(VI) under visible light. • Improved light harvesting and charge separation leads to the superior activities. • Cr(VI) in real laboratory wastewater can be effectively reduced by CDs-N-TiO 2-x. Abstract In this study, for the first time, a novel CDs-N-TiO 2-x nanocomposite was successfully fabricated by decorating the carbon quantum dots (CDs) on the nitrogen (N) and Ti3+ codoped TiO 2 nanoparticles using a facile hydrothermal-calcination method. X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy (DRS), electron paramagnetic resonance (EPR) spectra, and X-ray photoelectron spectroscopy (XPS), etc., were utilized to investigate the physicochemical properties of the catalyst and to confirm the successful introduction of CDs and the formation of N/Ti3+ codoping levels in the nanocomposite. Owing to the synergy between the modification of CDs and codoping of N and Ti3+, the as-prepared CDs-N-TiO 2-x nanocomposite exhibited enhanced visible light absorption and more efficient charge separation compared with its counterparts, such as the pristine TiO 2 , N-doped TiO 2 (N-TiO 2), N and Ti3+ codoped TiO 2 (N-TiO 2-x), and carbon quantum dots-TiO 2 (CDs-TiO 2), etc. As a result, the CDs-N-TiO 2-x nanocomposite displayed a remarkable performance for Cr(VI) reduction under visible light irradiation. Moreover, adding the appropriate amount of citric acid as the hole scavenger significantly increased the reduction rate of Cr(VI). In addition, the reduction efficiency was better under acidic conditions and considerably affected by the initial Cr(VI) concentration and catalyst dosage. Thermogravimetric analysis and cyclic runs demonstrated a unique thermal and chemical stability of the CDs-N-TiO 2-x nanocomposite. The mechanism of the enhanced photoreduction of Cr(VI) by the CDs-N-TiO 2-x nanocomposite was discussed based on all the characterization and experimental results. Moreover, the developed CDs-N-TiO 2-x nanocomposite also exhibited efficient photocatalytic performance to reduce the Cr(VI) contained in real laboratory wastewater. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • Sensitization by D35 broadens the absorption of catalyst into visible region. • Application of external bias enhances the charge carrier separation. • Film-structured D35-TiO 2 avoids the photocatalyst-solution separation problem. • D35-TiO 2 exhibits the high stability in cyclic utilization. • Feasible oxidation mechanism and BPA degradation pathway are investigated. Abstract Dye-sensitized photocatalytic suspension system for wastewater treatment is still limited in practice due to particle aggregation, fast charge carrier recombination, poor stability and recycling issue. In this study, we combine TiO 2 nano-crystalline film with D35 organic dye to fabricate a new visible-light photocatalyst D35-TiO 2 , which exhibits excellent visible light absorption. Its transient photocurrent is almost 10 times higher than pure TiO 2 under visible light illumination (λ > 420 nm). Besides the well characterizations of the D35-TiO 2 film, e.g., SEM, EDS, TEM, XRD, UV–Vis DRS, XPS, PL and I-T, degradation of bis -phenol A (BPA) is performed as the model reaction to test its photocatalytic activity. Meanwhile, we employ external bias in the reaction system to further enhance the photogenerated charge carrier separation, and improve the photocatalytic efficiency. Under the better experimental conditions of initial BPA concentration (5 mg/L), initial pH (pH 7), external bias (0.25 V) and sensitizer concentration (0.1 mM), BPA is almost completely degraded in 300 min, and the four intermediates are gradually mineralized. The ecotoxicity of BPA also decreases significantly after the photodegradation. During the reaction, O 2 − plays a dominant role, meanwhile ·OH and h+ D35 also contribute to the BPA degradation. After five cycles, the D35-TiO 2 film still maintain the normal photocatalytic activity. Due to the high stability and recyclability, the D35-TiO 2 nano-crystalline film provides a sustainable way for degrading micropollutants in wastewater. [ABSTRACT FROM AUTHOR]

Boronate affinity-based single-hole hollow imprinted polymers (BA-H-MIPs) were fabricated and sealed in dialysis bags for highly specific adsorption of cis -diol containing luteolin (LTL). This preparation strategy is implemented through the direct imprinted polymerization reaction occurring on the surface of carboxyl-capping polystyrene colloids (CPS), and the creating mechanism of single hole is the concomitant microphase separation and symmetrical volume shrinkage of imprinted shells. BA-H-MIPs possess uniform size (200 nm), single holes (50 nm) and hollow structure, and high-affinity sites density (0.27 mg m −2 ). In static adsorption, BA-H-MIPs show specific high-capacity uptake of target LTL at 318 K (46.96 mg g −1 ), fast capture kinetics (200 min), remarkable selectivity and regeneration performances. By a pH-responsive purification process, a commercially available 85% LTL could be simply concentrated to 95.88% by BA-H-MIPs, and the purified products have the similar antibacterial performance with standard substance. In addition, the special structure of hollow interior surfaces and single holes provide high site accessibility and abundant imprinted sites, which is the key factor for improving selective binding performance. [ABSTRACT FROM AUTHOR]

The application of layered double hydroxides for supercapacitors is drastically impaired by their adverse agglomeration and poor conductivity. Herein, we have successfully deposited ultrathin nickel cobalt aluminum layered double hydroxide nanopetals onto a conductive three-dimensional graphene structure via dept dip-coating and hydrothermal reaction. Under this facile process, the as-fabricated electrode displays superior electrochemical performance. To bestow high power and energy densities simultaneously for the asymmetric supercapacitor, modified mesoporous carbon derived from a molecular sieve with high power density, is used as the negative electrode. The as-assembled all solid-state supercapacitor exhibits superior electrochemical properties, including high specific capacitance, high power density, as well as excellent cyclic performance. Furthermore, such isolated supercapacitors render an effective solution for the need of electric energy storage devices with the advantages of portability and stability. [ABSTRACT FROM AUTHOR]

• Curled GelMA endow self-emulsifying ability to stabilize the air/water interface. • Mechanical property of as-prepared hydrogel is improved by chain entanglement. • GMPAO shows fast, high adsorption capacity, and selective uranium extraction. • Specific coordination between AO groups and uranium is the main binding mechanism. A convenient design of amidoxime (AO)-functionalized hydrogel sorbent containing interconnected pores is critical for facilitating fast and selective uranium extraction. To address this, air-in-water high internal phase emulsions (HIPEs) templated construction of AO functionalized macroporous hydrogel sorbents (GMPAO) is reported for highly efficient extraction of uranium from aqueous solution. Curled gelatin methacryloyl (GelMA) chains, as amphiphilic Pickering emulsifier and molecular surfactant, endow self-emulsifying ability to stabilize the air/water interface. GMPAO exhibits an open-cell structure (diameter is about 80 % between 200 µm and 300 µm) with interconnecting pores (distribution is about 70 % between 55 µm and 75 µm), and the chain entanglement between polyamidoxime (PAO) and GelMA enhances mechanical strength. Benefitting from the macroporous structure and abundant affinity sites, GMPAO displays a spontaneous uranium adsorption capacity of 386.61 mg g−1 at 298 K and faster uptake within 60 min, which are superior to better than the previously reported hydrogel sorbent. In addition, GMPAO hydrogel still achieves the highest capacity and remarkable removal rate of almost 100 % towards uranium in the presence of competitive ions, as well as excellent recyclability toward uranium capture. Except for the coordination between uranium with amidoxime groups, the carboxylates from GelMA also cooperate as a synergistic effect for uranium uptake by charge interaction, which enhances the binding affinity of the adsorbent to uranium. Most importantly, this work demonstrates a new strategy for preparing macroporous hydrogel sorbents with enough stability and provides a new perspective for recovering uranium from an aqueous solution. [ABSTRACT FROM AUTHOR]

Due to the unique properties of two-dimensional nanomaterials, an attempt to fabricate core-shell materials based on two-dimensional nanomaterials for supercapacitor is provided. Employing hydrothermal reactions, Co 3 O 4 @Ni(OH) 2 nanosheet core-shell structure, directly grown onto the surface of nickel foam substrate, was successfully fabricated with enhanced electrochemical properties. Ni(OH) 2 nanosheets anchored on Co 3 O 4 with two-dimensional structure effectively facilitate convenient ion diffusion and increase the active surface reacting with electrolyte. The as-fabricated material displays outstanding electrochemical performance, including high specific capacitance (1306 F g −1 ), fast charge–discharge rate and excellent cycling stability. Furthermore, an all solid-state asymmetric supercapacitor, based on Co 3 O 4 @Ni(OH) 2 and active carbon as positive and negative electrodes respectively, was also assembled, exhibiting a maximum energy density of 40 Wh kg −1 and high power density of 3455 W kg −1 as well as advantageous cycling stability (90.5% capacitance retention after 5000 cycles). The two-dimensional core-shell supercapacitor electrode, fabricated in our work, provides an effective solution to meet the growing demand for practical energy applications. [ABSTRACT FROM AUTHOR]

• A novel hollow Co 3 O 4 @NPC/rGO composite was synthesized. • Complete removal of SMX by Co 3 O 4 @NPC/rGO/PMS system was achieved within 5 min. • The ROS contributions in bulk solution and on catalyst surface were first calculated. • Co sites, C O and N doping sites contributed to the excellent catalytic activity. • Ecotoxicity, reusability, stability and application potential were evaluated. A novel reduced graphene oxide-supported hollow Co 3 O 4 @N-doped porous carbon (Co 3 O 4 @NPC/rGO) composite was synthesized via self-assembly and pyrolysis-oxidation using bimetallic zeolite imidazolate frameworks and graphene oxide as precursors. The as-obtained composite exhibited superior performance on peroxymonosulfate (PMS) activation over a wide pH range. Complete removal of sulfamethoxazole (SMX, 25 mg·L−1) was achieved within 5 min and the reaction rate constant was higher than those of the most reported heterogeneous catalyst/PMS systems for SMX degradation. It was demonstrated that both radical pathways (SO 4 −, OH, and O 2 −) and non-radical pathways (1O 2 and direct electron transfer) were involved in the SMX degradation. Significantly, the contribution ratio of each reactive oxidative species (ROS) in the bulk solution or on the catalyst surface was differentiated and calculated for the first time. SO 4 − both in the bulk solution and on the catalyst surface as well as the 1O 2 in the bulk solution were the dominant ROS. The possible degradation mechanism of SMX by Co 3 O 4 @NPC/rGO/PMS system was proposed. Co active sites with high activity, the electron-rich ketonic group and the nitrogen doping sites within Co 3 O 4 @NPC/rGO contributed to the excellent catalytic activity. The ecotoxicity of SMX and its intermediates was investigated. Besides, the reusability, stability and application potential in actual waterbodies of Co 3 O 4 @NPC/rGO were evaluated. Overall, this work expands the environmental application of metal–organic frameworks (MOFs)-derived hollow nanomaterials and provides a promising heterogeneous catalyst for the elimination of refractory contaminants by sulfate radical-based advanced oxidation processes (SR-AOPs). [ABSTRACT FROM AUTHOR]

[Display omitted] • Double-light induced reversible photochromism was realized in CaWO 4 : Yb3+, Er3+, Bi3+ phosphor. • Dual-mode luminescence modification was observed. • Multiple anti-counterfeiting can be obtained based on the photochromism and luminescence modification. • Dual-mode optical storage can be realized upon the UV and near infrared light excitation. Luminescence modification of rare earth ions doped phosphors based on photochromism is beneficial to expand their practical applications. Here, Bi3+ co-doping CaWO 4 : Yb3+, Er3+ phosphor is prepared. Color of CaWO 4 : Yb3+, Er3+, Bi3+ phosphor turn black grey upon the 254 nm ultraviolet light irradiation due to Bi3+ co-doping induced formation of the defects. Black grey CaWO 4 : Yb3+, Er3+, Bi3+ phosphor can recover their color to the primitive state under the stimulation of 473 or 532 nm lasers, exhibiting the double-light induced reversible photochromism. Dual-mode upconversion and downshift luminescence of CaWO 4 : Yb3+, Er3+, Bi3+ phosphor is reversibly modified based on its photochromism property. Potential applications of CaWO 4 : Yb3+, Er3+, Bi3+ phosphor are explored. The CaWO 4 : Yb3+, Er3+, Bi3+ phosphor is formulated into the inks, printed on the flexible substrate by the screen-printing technology. The luminescence color of printed various patterns can be changed based on the dual-mode luminescence modification, which demonstrate that the CaWO 4 : Yb3+, Er3+, Bi3+ phosphor ink is an ideal multiple anti-counterfeiting agent. The optical information recorded on the binary photochromic dot arrays of CaWO 4 : Yb3+, Er3+, Bi3+ sheet could be read upon the UV and near infrared light excitation, exhibiting the potential application of CaWO 4 : Yb3+, Er3+, Bi3+ phosphor as optical data storage medium. [ABSTRACT FROM AUTHOR]

[Display omitted] • Cd 0.5 Zn 0.5 S nanosheets were employed for H 2 evolution without a hole scavenger. • NaOH boosts hole scavenging and lessens Cd 0.5 Zn 0.5 S photocorrosion. • OH− adsorption is a rate-limiting step in photocatalytic H 2 generation. • The 'photocatalyst-electrolyte' strategy is applicable to other chalcogenides. The surface photocatalytic water splitting kinetics of ultrathin Cd 0.5 Zn 0.5 S nanosheets without hole scavengers is critically examined, focusing on the effects of the pH and NaOH as an electrolyte. In aqueous NaOH, hole scavenging from Cd 0.5 Zn 0.5 S is enhanced, which reduces catalyst photocorrosion. Based on the Langmuir-Hinshelwood model, OH− adsorption on Cd 0.5 Zn 0.5 S is the rate-limiting step of the whole process, and the reaction rate increases with increase in pH and temperature. The hydrogen evolution reaction (HER) activity of Cd 0.5 Zn 0.5 S reaches 12.44 and ∼ 20 mmol‧g−1‧h−1 at 303.15 K and 313.15 K (6 M NaOH, 0.5 h), respectively, two orders of magnitude higher than that in pure water. At high pH, direct OH− oxidation is favored, enhancing water splitting and indicating that water oxidation shifts to a ∙OH production pathway with activation energy approximately of 23.73 kJ‧ mol−1. Promisingly, this strategy to improve H 2 production rates is applicable to other chalcogenide photocatalysts (CdS, Cd 0.5 Mn 0.5 S, ZnSe and Cd 0.5 Zn 0.5 Se). [ABSTRACT FROM AUTHOR]

[Display omitted] • RuNi-alloy @ SC is prepared by desulfurization from bimetallic sulfide solid. • RuNi-alloy @ SC performs outstanding HER performance in wide pH range. • The S-doped defective carbon as a support further boosts the electron transfer. The preparation of alloy nanoparticles for hydrogen evolution reaction (HER) is a feasible strategy to optimize the inherent electronic structure of bimetallic catalysts, affording high catalytic activity. However, most of the metal alloys prepared currently exist in the form of bimetals, so it is urgent to find a facile method for preparing alloys. Herein, we developed a facile process by desulfurization from bimetallic sulfide solid solution for effectively constructing an electrocatalyst of RuNi alloy implanted with S-doped defective carbon (RuNi-alloy @ SC), which performs outstanding HER performance in both acidic and alkaline solutions. As expected, the optimized catalyst displayed quite a low overpotential of 34 mV at current density of 10 mA cm−2, small Tafel slope of 55 mV dec−1, and long-term durability over 120 h for HER operation in acidic solution. In alkaline medium, the low overpotential and Tafel slope of 93 mV and 96 mV dec−1 were further achieved. Density functional theory (DFT) simulations reveal the hydrogen adsorption free energy (ΔG H*) of RuNi alloy with different crystal faces, in which RuNi (1 0 3) face enables the lowest ΔG H* for HER, whose value equals to that of the Pt. This work provides an advanced method and novel insights into the design of alloy electrocatalyst for HER. [ABSTRACT FROM AUTHOR]

[Display omitted] • A way to adjust the underwater bubble adhesion was proposed. • The adhesion-adjustable surface is fabricated by femtosecond laser ablation. • The multi-manipulation of underwater bubbles on SMP surface were achieved. Manipulation of the behaviour of gas bubbles in aqueous environment is of vital significance in medical and microfluidic fields, and has attracted much research attention in the past few years. Making clear the interrelation between underwater bubbles' wettability and the solid surfaces topography to achieve the bubble adhesion regulation is a crucial factor of realizing the precise bubble manipulation without external stimulation, and a great challenge. Here, by combining the fish-scale-like morphology and rose-petal-like morphology into one sample and changing the proportion of each part, the underwater bubble adhesion could be adjusted from ultralow to low, high, and ultrahigh. The square-patterned array shape-memory polymer (SMP) surfaces with various adhesion forces were fabricated by femtosecond laser ablation and used to realize lossless transportation of a bubble in both horizontal and vertical direction. The high adhesion surface could be used to form programmable microbubble patterns. By taking advantage of the excellent thermal shape-memory character of SMP film, we realized the bubble in-situ release and reversely switch of the bubble adhesion based on the macroscopic and microscopic deforming-recovering of as-prepared SMP sample. The present study will inspire people to develop novel strategies to achieve multi-manipulation of bubbles in practical applications. [ABSTRACT FROM AUTHOR]

• Microgroove array was created on SMP surface through femtosecond laser etching. • The surface showed anisotropic and adhesion-switchable superhydrophobicity. • The wettability could be tuned between sliding and sticky states by pressing and heating. • The surface could be applied as a rewritable platform for droplet manipulation. Smart superhydrophobic surfaces with reversible wettability are attracting increasing attention. However, most of the reported smart superhydrophobic surfaces switch their wettability through reversibly changing surface chemistry rather than surface microstructure. In this paper, femtosecond laser direct writing was exploited to create microgroove array structure on the shape-memory polymer (SMP) substrates. The groove-structured surface exhibited superhydrophobicity and anisotropic wettability after fluoroalkylsilane modification. Due to the excellent shape-memory property of the SMP substrate, the morphology of the microgroove array could be transformed between original stand shape and deformed shape in response to heat. Correspondingly, water droplet on the surface was reversibly changed between sliding and sticky states through alternant pressing and heating treatments, indicating switchable adhesion of the laser-induced microgroove array. Meanwhile, the anisotropic wettability could also recover with the restoration of the grooved microstructure. Such wettability conversion on the resultant surface could be cycled 10 times without decline of the superhydrophobicity and anisotropic wettability. The anisotropic superhydrophobic SMP surface with both ultralow and ultrahigh water adhesion was successfully applied in rewritable liquid pattern, droplet-based microreactor, and gas sensing. By taking advantage of femtosecond laser, reversible microstructures and surface wettability can be obtained on various SMP substrates. We believe that such surfaces with thermal-responsive superhydrophobicity, anisotropic wettability, and switchable adhesion will have enormous potential applications in non-loss droplet transfer, biological detection, and lab-on-chip devices. [ABSTRACT FROM AUTHOR]

[Display omitted] • Almost 100 % of SMX was removed within 10 min by Mn-Co 3 O 4 /PMS system. • Mn doping improved the O v content in Mn-Co 3 O 4 and reduced the leached cobalt ions. • Contribution of oxidation pathways at different pH was studied for the first time. • Density functional theory calculations revealed the generation process of Co(IV) O. • O v promoted Co(IV) O formation by reducing the energy barrier of O O bond breakage. High-valent cobalt-oxo species show obvious advantages in oxidant utilization efficiency and selective oxidation of organic pollutants, while reducing the energy barrier of O O bond cleavage of peroxymonosulfate (PMS) to continuously produce high-valent cobalt-oxo species remains challenging. Herein, binary metal–organic frameworks-derived Mn-Co 3 O 4 was synthesized and utilized to activate PMS for sulfamethoxazole removal. Almost 100 % of sulfamethoxazole was removed within 10 min by Mn-Co 3 O 4 /PMS system and the reaction rate constant was 0.3148 min−1. Moreover, Mn doping improved oxygen vacancies content in Mn-Co 3 O 4 and reduced the leaching of cobalt ions. The results exhibited that hydroxyl radicals, sulfate radicals, superoxide radicals, singlet oxygen, electron transfer mediated by metal-PMS*, and high-valent cobalt-oxo species resulted in the sulfamethoxazole removal and their contributions were highly dependent on pH values. Under acidic, neutral, and weakly basic conditions, singlet oxygen-dominant non-radical oxidation was the primary pathway. While under strong alkaline conditions, radical oxidation was the primary pathway, in which superoxide radicals and hydroxyl radicals played dominant roles. It was also found that both acidic and alkaline conditions were conducive to high-valent cobalt-oxo species production. The formation process of high-valent cobalt-oxo species was revealed through density functional theory calculations. It has been demonstrated that oxygen vacancies decreased the adsorption energy of PMS onto Mn-Co 3 O 4 and the energy barrier of O O bond breakage of PMS in Co(II)-PMS*, promoting the generation of high-valent cobalt-oxo. Additionally, the Mn-Co 3 O 4 /PMS system showed desirable potential for eliminating refractory organic pollutants from actual waterbodies. This study deepens the understanding of defect engineering-assisted high-valent metal-oxo species formation mechanism. [ABSTRACT FROM AUTHOR]

• CO 2 Pickering emulsion templated hollow porous microspheres with amidoxime are prepared. • This simple and fast method do not need surfactants and expensive pore template. • AO-HP-MF shows excellent uptake kinetics, high adsorption capacity, and affinity. • AO-HP-MF has hollow porous morphology, uniform size, and high-density of amidoxime. Conventional methods for preparing amidoxime-based hollow porous sorbents (HPS) for uranium (U(VI)) extraction usually use solution or emulsion process with surfactant and expensive pore template, so they cannot meet requirements of economic and environmentally friendly evaluation. Here, hollow porous microspheres functionalized with abundant amidoxime (AO-HP-MF) are prepared via CO 2 Pickering emulsion (or bubble) templated interfacial polymerization and assembly of site chains for highly efficient U(VI) extraction. For this strategy, in situ generated CO 2 bubbles are utilized as core template, SiO 2 nanoparticles serve dual roles of an emulsion stabilizer and pore template for polymer shell. Meanwhile, assembled polyvinyl polyamine (PEA) chains provide lots of sites for post-modification with amidoxime. Taking the advantages of well-defined hollow porous morphology, uniform size, and high-density of amidoxime, AO-HP-MF is expected to possess excellent adsorption capacity, fast equilibrium rate, and high selectivity. The equilibrium time and maximum adsorption capacity are 1.0 h and 553.3 mg g−1 at 298 K, respectively, and the monolayer chemisorption based on chelation between U(VI) and amidoxime is main mechanism of selective uranium extraction. Their uniform size may be associated with the pressure-dependent formation condition of in situ generated CO 2 bubbles, which is different from traditional emulsion templated microspheres with fairly irregular size. Most importantly, AO-HP-MF has remarkable selectivity for U(VI), even if massive amounts of Ca2+, Mg2+, Na+, Zn2+, and other ions exist in the simulated solution. Therefore, this work not only presents a new clue to fabricate high performance sorbents via simple bubble templates, but also provides a novel platform for U(VI) extraction. [ABSTRACT FROM AUTHOR]

• A novel TiO 2 /g-C 3 N 4 -PS system was proposed for micropollutant degradation. • The TiO 2 /g-C 3 N 4 -PS system exhibits a high efficiency, nonselectivity and great stability. • The effects of different reaction conditions on the degradation rate of AAP were systematically studied. • The addition of PS greatly improved the degradation efficiency and oxidizing performance of the TiO 2 /g-C 3 N 4 system. • The photocatalytic mechanism in the TiO 2 /g-C 3 N 4 -PS system was proposed. A novel TiO 2 /g-C 3 N 4 -PS system was proposed, in which a TiO 2 /g-C 3 N 4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO 2 /g-C 3 N 4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO 2 /g-C 3 N 4 -PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation. The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO 2 /g-C 3 N 4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO 2 /g-C 3 N 4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO 4 −, OH and h+ all contribute to eliminating organic compounds. Additionally, the TiO 2 /g-C 3 N 4 -PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol, bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO 2 /g-C 3 N 4 -PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants. [ABSTRACT FROM AUTHOR]

• Superhydrophobicity-memory surface was prepared by femtosecond laser ablation. • Micropillar array was formed on the surface of shape-memory polymer. • The superhydrophobicity can be reversibly switched by pressing-heating treatments. • The superhydrophobic surface have resistance to physical and chemical damages. • Rewritable platform for directional liquid transportation was realized on the surface. Superhydrophobicity-memory surface that can transform its surface morphology and wettability in response to heat was successfully prepared by using femtosecond laser to directly induce hierarchical micropillar array on the surface of a thermal-responsive shape-memory polymer (SMP). When the resultant surface was pressed by an external load to make the micropillars lean to one side, the superhydrophobicity would weaken caused by the deformation of the micro/nanoscale structures. Interestingly, the original surface morphology and wettability could recover just through a simple heating process due to the excellent macro/microscopic shape-memory effect of such polymer. Even after 10 cycles of pressing-heating treatments, the surface was also able to re-obtain its original ultralow-adhesive superhydrophobicity. In addition to the restorable property, the superhydrophobicity of the as-prepared surface was very stable since the laser-induced microstructure on the SMP could withstand various harsh treatments/environments, such as sandpaper abrasion, tape peeling, UV irradiation, and the immersion in different pH solutions. The superhydrophobicity-memory surface was successfully used as a rewritable platform for directional liquid transportation. It is anticipated that the laser-induced hierarchical micropillars with superhydrophobicity-memory property will have significant applications in tunable wettability, liquid/droplet manipulation, and chemical engineering. [ABSTRACT FROM AUTHOR]

• Implementing in situ hydrothermal growth of Cu NPs on textiles. • Introducing polydopamine as a template to facilitate growing nanoparticles. • Fibrous structure has been preserved with nanoparticles deposited on fibers. • Durable and highly-flexible textile based wearable sensor was developed. Incorporating conductive components into fibrous structure for wearable applications has attracted research attention recently. However, utilizing the flexibility and wearability of textiles to maintain a stable and durable wearable performance is a big challenge, as the intrinsic properties of textiles and the conductivity of the incorporated components have to work synergically in the fibrous system without compromising. In this work, polydopamine-templated PET fabrics were prepared to grow copper nanoparticles (Cu NPs) on the surface of the knitted PET fabrics. The surface morphology, chemical composition and crystalline structure of the Cu NP-coated PET fabrics were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The results showed that Cu NP layer was successfully deposited onto the polydopamine-templated PET fabrics. The fabrics showed excellent electrical conductivity due to the loading of Cu NPs. The unique knitted structure together with the durable deposition of Cu NPs resulted in negative change in electrical resistance of the fabrics under strains, granting the fabrics the potential in wearable applications. The Cu NP-coated PET fabrics were demonstrated to be applicable as wearable strain sensors and electrical heaters. [ABSTRACT FROM AUTHOR]

• PVBC-g-PCE is prepared by UV-initiated polymerization from PolyHIPE for recovery of Li+. • PVBC-g-PCE has strong physical strength, high density of sites, and macroporous structure. • PVBC-g-PCE shows excellent adsorption kinetics, binding capacity, and specific selectivity. • Chemisorption via host-guest interaction may be main driving force to selective recognition. It is highly desirable to develop an efficient adsorbent with large capacity, high selectivity and fast kinetics to recovery virtually inexhaustible lithium ion (Li+) resources from salt lake brine. In this work, 2-(allyloxy) methylol-12-crown-4 ether (2AM12C4) functionalized polymer brushes (PVBC-g-PCE) from macroporous polymeric high internal-phase emulsion (PolyHIPE) using UV-initiated surface polymerization are synthesized for selectively recovery of Li+. PVBC-g-PCE possesses the advantages of strong physical strength, high density of accessible binding sites, and the size of highly permeatable voids and interconnecting pores is about 8.0–18 µm and 3.3–4.8 µm, respectively, which is a favorable adsorbent for specific capture Li+. PVBC-g-PCE has a maximum capacity at pH 6.0, and the pH-dependent adsorption amount suggests the grafted polymer brushes of 2AM12C4 is the driving force to enhance binding performance. PVBC-g-PCE has a fast adsorption equilibrium within 45 min, and the kinetic results are well-described by the pseudo-second-order model, indicating the specific host-guest interaction between functionalized 2AM12C4 and Li+ is the main adsorption mechanism. Moreover, the maximum monolayer binding amount of PVBC-g-PCE is 4.43 mg g−1, and the strong affinity in the presence of four kinds of interfering ions (i.e. Na+, K+, Mg2+, and Ca2+) is also observed, which can also be proved by the high relative selectivity separation coefficient (α r) between 3.16 and 7.98. It is expected that this PVBC-g-PCE with abundant easy-to-access specific recognition sites can be applied as a promising adsorbent for effective separation of Li+. [ABSTRACT FROM AUTHOR]

• Novel CQDs-TiO 2−x /rGO catalyst was prepared via a facile, cheap and green method. • Light absorption edge of CQDs-TiO 2−x /rGO was significantly extended to 481.93 nm. • The Presence of CQDs and rGO provided dual channels for the transport of electrons. • Addition of PS promoted the production of SO 4 −/OH with stronger oxidizing power. • CQDs-TiO 2−x /rGO shows great potential on the effective wastewater remediations. In this work, a novel carbon quantum dots and Ti3+ co-modified TiO 2 -graphene nanocomposite (CQDs-TiO 2−x /rGO) was successfully fabricated via a facile, relatively cheap and environmentally friendly process. The light absorption edge of CQDs-TiO 2−x /rGO was significantly extended to 481.93 nm due to the formation of Ti3+ impurities and Ti O C bonds and the excellent photon conversion function of CQDs. The presence of CQDs and rGO with an excellent conductivity provide dual channels for the transfer of electrons, leading to the rapid transportation and effective separation of charge carriers. To enhance the mineralization of organics in the water treatment, persulfate (PS) was introduced to the developed the CQDs-TiO 2−x /rGO-Vis reaction system. Due to the excellent photocatalytic performance of the CQDs-TiO 2−x /rGO nanocomposite, PS was efficiently activated by CQDs-TiO 2−x /rGO to produce a large number of sulfate radicals and hydroxyl radicals under visible-light irradiation. As a result, 10 mg/L bisphenol A (BPA) and phenol were completely degraded and the mineralization efficiency was improved to 82% and 76% by CQDs-TiO 2−x /rGO (0.5 g/L) in the presence of PS (2 mM) in only 5 and 20 min, respectively. Additionally, the excellent performance of CQDs-TiO 2−x /rGO was also exhibited by the efficient reduction of Cr(VI) under visible-light irradiation. The findings of the present study highlight the great potential of CQDs-TiO 2−x /rGO for environmental remediations. [ABSTRACT FROM AUTHOR]

[Display omitted] • Tetragonal and cubic spinel M x Mn 3-x O 4 (M = Co, Zn, Cu, Fe; x = 1,2) are synthesized. • Cubic spinel M 2 MnO 4 exhibit better catalytic performance for PMS activation. • Electron transfer resistance is decreased in M 2 MnO 4. • The regeneration yields of 'M' and Mn are increased in M 2 MnO 4 synchronously. • Large amount of SO 4 ∙− are generated in M 2 MnO 4 /PMS system. In this study, the morphology and surface characteristics of different M x Mn 3-x O 4 (M = Co, Zn, Cu, Fe; x = 1, 2) nanoparticles and their catalytic performance for peroxymonosulfate (PMS) activation to degrade trichloroethylene (TCE) were compared. The characterization results showed that a highly crystalline manganese structure was synthesized, and cubic spinel (M 2 MnO 4) and tetragonal spinel (MMn 2 O 4) were confirmed. The experimental results indicated that, compared with the tetragonal spinel catalysts, the cubic spinel catalysts exhibited higher PMS-specific catalytic activity and TCE removal efficiency due to the reduction in electron transfer resistance and the increase of the surface area. In addition, all the synthesized nanoparticles exhibited remarkable reusability, a low metal dissolution rate, and a wide applicable pH range (4 to 11) for efficient PMS activation. The free radical-scavenging experiments and electron paramagnetic resonance (EPR) analysis further verified the role of ∙HO and SO 4 ∙− in the removal of TCE and the large amount of stronger free radicals (SO 4 ∙−) generated by the cubic spinels. This study revealed that stable cubic spinel nanoparticles can be synthesized at room temperature by adjusting the ratio of manganese and transition metals; these nanoparticles showed excellent catalytic performance for PMS activation. These research results are important for the synthesis of heterogeneous catalytic oxidation catalysts. [ABSTRACT FROM AUTHOR]

[Display omitted] • A novel heterogeneous Fenton-like process driven by visible light is proposed. • Reactivity is strongly enhanced without the use of reducing agents and TiO 2 modification. • Fe(III) reduction for PS activation can be accomplished via LMCT in organic-TiO 2 -Fe(III). • It can be operated at low iron dosage and neutral conditions against Fenton system. • The excellent and long-lasting catalytic performance is mediated via synergistic effect. Efficient transformation of Fe(III) to Fe(II) enhances the efficiency of persulfate-based Fenton-like process (e.g., Fe(II)-PS system). Here, we developed a novel heterogeneous Fenton-like system driven by visible light (organic-Fe(III)-PS-TiO 2 -Vis) for effective reduction of Fe(III), activation of PS and degradation of organic pollutants without the need for external reducing agents or modifications in TiO 2. The visible light-induced ligand-to-metal (organic-to-TiO 2) charge transfer (LMCT) remarkably boosting Fe(III) reduction to increase reactive oxygen species (ROS) via PS activation, and further enhanced the self-degradation and mineralization of various organics, including phenolics (bisphenol A and phenol), antibiotics (ibuprofen and tetracycline), and dyes (methylene bule and rhodamine B). Compared with traditional Fe(II)-PS and Fe(II)–H 2 O 2 systems, the organic-Fe(III)-PS-TiO 2 -Vis process requires a lower dosage of iron salt. The effective pH range has been broadened to neutral conditions due to effective prevention of Fe(III) precipitation and rapid circulation of Fe(III)/Fe(II). The comprehensive mechanistic study indicated that a synergistic effect was generated via Fe(III) reduction, PS activation, ROS generation and organic decomposition, resulting in sustainable and excellent catalytic performance of this novel Fenton-like process. Further, the results of cycling experiments and tests involving real industrial wastewater highlight the enormous potential of the proposed LMCT-mediated heterogeneous Fenton-like process in environmental remediation. [ABSTRACT FROM AUTHOR]

The introduction of NCs and PFOAI can reduce the interface defects, enhanced its ultraviolet light utilization, and significantly improved the V OC and PCE of the device. [Display omitted] • Cs 3 MnBr 5 : Ce3+ nanocrystals and PFOAI are introduced into perovskite solar cells. • The synergistic passivation effect improves the Voc to 1.233 V. • The synergistic passivation effect of NCs and PFOAI improves the PCE to 24.24 %. • Non-encapsulated modified PSCs exhibit excellent long time, light and humidity stability. Interface engineering take as a crucial role in enhancing the performance of perovskite solar cells (PSCs). Here, we propose a comprehensive strategy to improve the performance and stability of PSCs through dual-interface modification approach. This strategy involves simultaneously introducing lead-free Cs 3 MnBr 5 : Ce3+ nanocrystals (NCs) between SnO 2 electron transport layer and the perovskite layer, as well as 1H,1H-Perfluorooctylamine iodide (PFOAI) at the interface between perovskite and Spiro-OMeTAD hole transport layer. Firstly, we successfully prepare Cs 3 MnBr 5 : Ce3+ NCs, which exhibits an extensive ultraviolet response and effective blue photoluminescence. The photoluminescence quantum yield of Cs 3 MnBr 5 : Ce3+ NCs can reach 90 %, demonstrating efficient photon down-conversion ability and efficient defect passivation. Simultaneously, the organic halide salt PFOAI with super-hydrophobic properties efficiently passivates defects on the surface of perovskite and improves moisture-resistance of perovskite films. Taking advantage of these synergistic effects, we achieve efficient PSCs based the Cs 0.05 (FA 0.83 MA 0.17) 0.95 Pb(I 0.83 Br 0.17) 3 and Cs 0.05 (FA 0.95 MA 0.05) 0.95 Pb(I 0.95 Br 0.05) 3 with power conversion efficiency (PCE) of 23.88 % and 24.24 %. We also achieved an ultrahigh open-circuit voltage (V OC) of 1.233 V, which represents one of the highest V OC values in a perovskite film with a bandgap of ∼1.60 eV. Additionally, the non-encapsulated double-interface modified PSCs exhibit long time, light and humidity stability. This study explores a novel and comprehensive strategy for manufacturing PSCs with high V OC , high PCE, and good stability. [ABSTRACT FROM AUTHOR]

[Display omitted] • Core-shell heterostructured CoFe@NiFe PBA is successfully synthesized. • Encapsulation of CoFe PBA with NiFe PBA shell alleviates dissolution of the core material during Na+ insertion/extraction. • Favorable hydrophilicity and large specific surface area of the shell material promotes accessibility of electrolyte ions. • Higher electrical conductivity of the shell material enhances charge transfer on the electrode. Rational design of stable and high-capacity faradaic electrode materials is crucial for enhancing the desalination performance of hybrid capacitive deionization (HCDI). In this work, to fully exploit the advantages of high-capacity CoFe Prussian blue analogs (PBA) and structurally stable NiFe PBA, a core–shell heterostructured CoFe@NiFe PBA is successfully synthesized by a two-step co-precipitation method. The construction of the core–shell heterostructure not only suppresses dissolution of the CoFe PBA core, but also facilitates fast charge transfer and efficient ion diffusion during Na+ ions insertion/extraction. With an optimal NiFe PBA shell thickness of 30 nm, the core–shell structured PBA electrode demonstrates outstanding cycling performance with a capacity retention of 72.6 % over 10,000 charge/discharge cycles. Moreover, when utilized as the cathode material in HCDI, the core–shell heterostructured PBA exhibits intriguing desalination performance, including a high desalination capacity of 49 mg g−1 and excellent desalination stability over 200 cycles (77.7 %). This paper presents a straightforward strategy for designing core–shell heterostructured PBA electrode, with the potential to advance the development of high-performance capacitive desalination. [ABSTRACT FROM AUTHOR]

Copper nanoparticles (NPs) deposited on the surface of self-organized highly ordered TiO 2 nanotube arrays (Cu/TiO 2 NTs) were synthesized by electrochemical anodization and the successive ionic layer adsorption and reaction technique. The morphology, elemental composition, crystallinity, light absorption ability and photoelectrochemical property of the as-prepared Cu/TiO 2 NTs electrode were distinguished based on various characterizations. X-ray photoelectron spectroscopy showed that the Cu NPs existed as Cu(II)O and Cu(I) 2 O on the TiO 2 surface. The current–voltage curve of Cu/TiO 2 NTs electrode indicated a rectifying behavior. The surface sensitization of TiO 2 NTs by CuO and Cu 2 O NPs enhanced the absorption of visible light. Meanwhile, the enhanced charge separation was demonstrated by electrochemical impedance spectroscopy, transient photocurrent response and photovoltage measurements. Besides, Cu/TiO 2 NTs electrode showed more effective photoconversion efficiency and enhanced photoelectrocatalytic activity towards the degradation of diclofenac than pure TiO 2 NTs electrode under simulated solar light irradiation, which was attributed to the synergistic effects between nanotubular structures of TiO 2 and uniformly dispersed copper nanoparticles, as well as the small bias potential. Furthermore, the photoelectrocatalytic mechanism was proposed and the possible radical species involved in the photoelectrocatalytic degradation of diclofenac were analyzed by active species trapping. The Cu/TiO 2 NTs electrode exhibited high reusability. [ABSTRACT FROM AUTHOR]

• The Lipo@MCA can effectively achieve Sono-Chemodynamic-Immunotherapy for tumors. • Mitochondrial dysfunction can be induced through oxidative stress and Ca2+ overload. • Inhibiting PI3K/AKT can effectively inhibit tumor cell migration and invasion. • The Lipo@MCA can inhibit the development of tumors, with good biological safety. Cancer immunotherapy has improved the survival rate of patients with malignant tumors. However, the response of solid tumors to immunotherapy is quite limited. Here, we report a pH-responsive nanocomposite for augmented sonodynamic-chemodynamic immunotherapy. This Mn-CaCO 3 -2,2′-azobis[2-(2-imidazolin-2-yl) propane]-dihydrochloride (AIPH) nanosystem, Lipo@MCA, was prepared through a simple two-step reaction. It released sonosensitizer AIPH and Ca2+ within the acidic tumor microenvironment. AIPH generated alkyl free radicals under ultrasound irradiation, and Mn2+ produces ·OH through Fenton-like reaction. The Ca2+ induced calcium overload in tumor cells. This induced mitochondrial dysfunction and promoted tumor cell apoptosis. Lipo@MCA also inhibited the phosphorylation of Akt and PI3K. In vitro experiments indicated that the nanoparticle inhibited tumor cell invasion and migration, and induced tumor cell apoptosis. In vivo experiments demonstrated that Lipo@MCA inhibited tumor growth by promoting cytokine secretion, stimulating dendritic cell maturation, and enhancing T-cell differentiation. In summary, this study paves the way for synergistic inhibition of tumor cell metastasis and immunotherapy in solid tumors through PI3K signaling pathway inhibition. [ABSTRACT FROM AUTHOR]

• Biodegradable CoSnO 3 nanocubes are employed as sonosensitizers and nanozymes. • GQD/CoSnO 3 is constructed by depositing GQD topoisomerases inhibitors on CoSnO 3. • Heterojunction-fabricated GQD/CoSnO 3 shows cascaded amplification of ROS generation. • Tumor-specific release of GQDs for chemotherapy is realized after completion of SDT. • GQD/CoSnO 3 achieves complete tumor eradication through chemotherapy, SDT, and NCT. Albeit nanozymes are widely applied for nanocatalytic therapy (NCT), the unsatisfactory catalytic activity of nanozymes accompanied by complex tumor microenvironment (TME) greatly pose a barrier to the therapeutic effect of NCT. Moreover, developing a high-efficiency nanozyme with biodegradability is still a huge challenge, which hinders their further clinical translation. Herein, pH-responsive biodegradable CoSnO 3 nanocubes are synthesized and employed as sonosensitizers and nanozymes due to their narrow bandgaps (1.6 eV) and Co2+/Sn4+-mediated multi-enzyme activities. After depositing the graphene quantum dot (GQD) topoisomerase inhibitors on CoSnO 3 nanocubes, the heterojunction-fabricated GQD/CoSnO 3 shows cascaded amplification of ROS generation, which is ascribed to the inhibition of electron-hole pair recombination, Co2+-mediated peroxidase (POD)-mimic catalytic reaction to generate OH, Co3+/Sn4+-mediated depletion of overexpressed GSH, and catalytic decomposition of endogenous H 2 O 2 for providing more O 2 for enhanced SDT. More importantly, GQD/CoSnO 3 heterojunctions are slowly degraded in the weakly acidic TME, resulting the tumor-specific release of GQDs after completion of SDT, which could induce DNA damage and cell apoptosis for chemotherapy to further enhanced the antitumor efficacy. The synergetic therapeutic efficacy of GQD/CoSnO 3 heterojunctions through chemotherapy, SDT, and NCT could realize "three-in-one" multimodal oncotherapy to completely eliminate tumors without recurrence. This work provides a paradigm of exploring pH-responsive biodegradable nanozymes as a drug carrier to realize tumor-specific drug release for enhanced SDT and NCT. [ABSTRACT FROM AUTHOR]

[Display omitted] • A robust polyoxometalate and metal–organic framework hybrid is designed. • The hybrid is a catalytic reservoir for generation of reactive oxygen species. • The hybrid can eradicate bacteria and enhance wound healing efficiently. • Antibacterial mechanism is investigated. Infections by bacteria always post significant challenges to global human health. Recent developed non-antibiotic treatment, such as using metal–organic frameworks (MOFs) to kill bacteria by generating reactive oxygen species (ROS) represents a promising strategy. However, drawbacks including low efficiencies of ROS generation and high concentrations of toxic metal ions released always exist. We have creatively designed a robust polyoxometalate (POM) and MOF hybrid (denoted as CuPOM-MOF@S) that functions as an efficient catalytic reservoir for cascaded generation of ROS (mainly ·OH) from H 2 O 2 thus eradicating bacteria and enhancing wound healing at an administration dosage as low as 5 μg∙mL−1. The remarkable antibacterial capability surpasses those for most MOF-based materials reported thus far, which is mainly attributed to the reservation of massive catalytic copper ions, the synergistic effect regarding catalytic activity between MOFs and Keggin-type POMs as well as its bacteria-capturing ability by the coated surfactants. Its biological safety is investigated and confirmed by cell cytotoxicity and body weight assessment. This work presents a prospective strategy towards cascaded ROS generation by combining inorganic catalytic POMs with MOFs thus for multiple biomedical applications including treating bacterial infections and cancer as well as inducing biological signal responses. [ABSTRACT FROM AUTHOR]

[Display omitted] • An innovative Nucleation crystallization pelleting process (NCP) is proposed. • Seeds provided for crystallization of Mn ions active sites. • High purity of Mn ions in the crystals, which can be used directly after acid leaching. • No harmful sludge containing manganese is produced during NCP. • Pilot experiment validated the stablility of multi-stage NCP system. To address the issues of wasting manganese resources and generating hazardous chemical sludge during the removal of manganese (Mn) ions from acidic electrolytic manganese wastewater using conventional chemical precipitation, an innovative nucleation crystallization pelleting process (NCP) was proposed. The NCP aimed to recover Mn ions without generating hazardous sludge. By pre-adding seeds with active sites for Mn ions attachment into the NCP reactor, Mn ions were induced to adhere to the seed surfaces in the form of MnCO 3 by adjusting the Na 2 CO 3 dosage and hydraulic conditions. The results demonstrated effective Mn ion removal, with Mn ions being reduced from 3800 mg/L to about 20 mg/L after five-stage NCP reactors. The Na 2 CO 3 dosage for the first to fifth stage was 3.0, 2.6, 2.2, 1.65, and 1.2 g/L, respectively. Optimizing the hydraulic conditions facilitated enhanced mass transfer between Mn ions and seeds, with the optimum upward flow rate of the reactor determined as 60 m/h. In addition, the optimized seed filling ratio was found to be 15 %. The seeds exhibited stability as they were recycled three times, and the crystallization of Mn ions showed little variation. Moreover, after a 20-day operation, the crystal seeds reached a size of approximately 0.8 mm, exhibiting a moisture content below 3 %. The grade of manganese ions exceeded 44 %, in terms of ore, and the extraction rate of manganese ions reached 98.17 % after acid leaching of the crystals. These crystals can be directly reused in the electrolytic manganese production, thereby improving the utilization rate of manganese ions. In conclusion, the NCP technology shows promise for effective Mn ion removal and recover without generating hazardous sludge. [ABSTRACT FROM AUTHOR]

• The CaCO 3 @Pt-TiO 2 NPs is engineered for synergistic sonodynamic immunotherapy. • The Pt NPs increase ROS quantum yield of TiO 2 and overcome tumor hypoxia. • Ca2+ overload could amplify oxidative stress and induce immunogenic cell death. • Nanocomposites trigger strong immunogenic cell death and antitumor immune response. Ultrasound (US)-triggered sonodynamic therapy (SDT) has become a promising method and has attracted considerable attention for cancer therapy due to its high accuracy, deep tissue penetration, and few side effects. However, the therapeutic efficacy of SDT is limited by the hypoxic tumor microenvironment (TME) and the low quantum yield of sonosensitizers. Immunogenic cell death (ICD) induced by calcium ion overload has attracted widespread attention because it can trigger antitumor immune responses and reconstitute tumor immune microenvironment (TIM). In this study, a TME-responsive CaCO 3 @Pt-TiO 2 nanocomposite (CaPT) was engineered, which combined platinum (Pt) nanoparticles and CaCO 3 nanoparticles to amplify oxidative stress in cancer cells for cancer sonodynamic immunotherapy. The Pt nanoparticles not only enhanced the reactive oxygen species (ROS) quantum yield of TiO 2 during SDT but also catalyzed the decomposition of H 2 O 2 to overcome tumor hypoxia. The CaCO 3 @Pt-TiO 2 nanocomposite responded to the TME and released a large amount of Ca2+, which amplified oxidative stress and triggered robust ICD activation. This process greatly contributed to inflammatory cell infiltration and shifted the TIM from cold to hot. The experimental results confirmed and demonstrated the synergistic therapeutic effects of sonodynamic-immunotherapy in vitro and in vivo. The antitumor mechanisms of sonodynamic immunotherapy were demonstrated by RNA sequencing. This study paves the way for Ti-based nanosensitizers, providing a novel strategy for sonodynamic-cooperated immunotherapy. [ABSTRACT FROM AUTHOR]

[Display omitted] • The addition of Fe3+ and PS to the DOM solution significantly improved the catalytic performance. • Ligand-to-metal charge transfer resulted in enhanced Fe3+ reduction and PS activation. • More than 56% of the PS was decomposed via Fe2+ generated by the LMCT effect. • SO 4 − and OH were identified as the dominant reactive species present in the DOM-Fe3+-PS-Vis process. • The highly hydrophobic moieties with more aromatic carbon in DOM are beneficial for promoting catalytic performance. The activation of persulfate (PS) in dissolved organic matter (DOM) solution using visible light has demonstrated potential for advanced wastewater treatment. This study presents a novel visible light-assisted homogeneous Fenton-like process (DOM-Fe3+-PS-Vis) for the efficient DOM degradation, based on the ligand-to-metal charge transfer (LMCT)-induced enhanced Fe3+ reduction and PS activation. The simultaneous addition of Fe3+ and PS to DOM-enriched solutions under visible light significantly improved PS activation, leading to the degradation of DOM and coexisting organic contaminants. The PS decomposition rate constant in the DOM-Fe3+-PS-Vis process was calculated to be 3.5–20.69 times higher than that of the DOM-PS-Vis, Fe3+-PS-Vis, and DOM-Fe3+-PS-Dark systems. Notably, over half of the decomposed PS in the DOM-Fe3+-PS-Vis process was activated by Fe2+ generated via the LMCT between DOM and Fe3+. SO 4 − and OH were identified as the dominant reactive species present in the DOM-Fe3+-PS-Vis process with the steady-state concentration of 1.63–4.11 × 10−13 M and 0.07 × 10−13 M, respectively, which were 2.4–81.5 and 0.5–7 times higher than those in the DOM-PS-Vis, Fe3+-PS-Vis, and DOM-Fe3+-PS-Dark systems. Additionally, hydrophobic components with more aromatic carbon in DOM were found to promote the catalytic performance of the DOM-Fe3+-PS-Vis process. This study highlights the efficiency and promise of LMCT-induced enhanced Fe3+ reduction and PS activation in DOM-enriched solutions under visible light for advanced wastewater treatment. [ABSTRACT FROM AUTHOR]

Highlights • MBA-H-5.0 is presented by entrapment of boronic acid and vinyl-functionalized multiwalled carbon nanotubes. • Surface hydrophilicity, porosity and specific surface area were enhanced by addition of VMWCNTs-COOH-BA. • MBA-H-5.0 shows fast binding, remarkable recyclability, and specific capture of LTL. • This study sheds new light on the design of high performance hybrid hydrogel by embedding functional adsorbents. Abstract By immobilization of nano-sized adsorbents into a water-rich matrix to fabricate a hybrid hydrogel has raised considerable attention in aqueous phase molecular recognition, owing to the combination of inherent advantages of easy operation, good mechanical performance and abundant recognizing sites by a light-triggered chemical polymerization strategy. The boronic acid and vinyl-functionalized multi-walled carbon nanotubes (VMWCNTs-COOH-BA) were introduced to hydrogel matrix, and then as-prepared hybrid hydrogels (MBA-H-5.0) were applied for selective adsorption and separation of luteolin (LTL). Surface hydrophilicity, mechanical performance and specific surface area of the hybrid hydrogels were enhanced by the addition of functional VMWCNTs-COOH-BA. In static adsorption, MBA-H-5.0 showed a large LTL loading amount (35.91 mg g−1 at 308 K), fast capture kinetics (3.0 h), remarkable selectivity, and excellent recyclability (8.24% loss in adsorption amount after seven adsorption-desorption cycles). The abundant boron-containing functional groups such as boronic acid played a vital role on adsorption, and the copolymerization of VMWCNTs-COOH-BA and hydrogel matrix prevented from the leakage of nanostructured adsorbents. This study sheds new light on the design of high performance hybrid hydrogel by embedding functional adsorbents for selective separation and enrichment of natural flavonoids. [ABSTRACT FROM AUTHOR]

[Display omitted] • Fe/Mn co-doped biochar (Fe-Mn-C) was prepared and used as an ozonation catalyst. • The obtained Fe-Mn-C showed excellent catalytic activity and stability. • Fe-Mn-C promoted the decomposition of ozone into reactive oxidizing species (ROS). • Recycling of Fe/Mn redox pairs enhanced ozone decomposition and ROS generation. The fabrication of efficient, stable, and low-cost catalysts is crucially important for the catalytic ozonation process for the removal of recalcitrant pollutants. In this study, we present a facile impregnation-pyrolysis method for the preparation of novel porous Fe/Mn co-doped biochar (Fe-Mn-C) with excellent catalytic activity and reusability for the catalytic ozonation of ibuprofen (IBP). The incorporation of Fe/Mn heteroatoms into the carbon skeleton of biochar not only produced more defective sites and promoted the charge transfer on the materials surface but also created active Fe/Mn species with multi-valence states for ozone activation. As a result, >95% of IBP (50 mg/L) and 80.5% of total organic carbon can be rapidly removed within 9 min in the Fe-Mn-C/O 3 process at a pH of 7, ozone dosage of 4.93 mg/min, and Fe-Mn-C dosage of 0.5 g/L. The catalytic reaction rate in Fe-Mn-C/O 3 was 6.58 times higher than that of sole ozonation and 2.3–4.1 times higher than that of catalytic ozonation with other catalysts (e.g., biochar, Fe-doped biochar, Mn-doped biochar, activated carbon, Fe 3 O 4 and MnO 2). Moreover, the obtained Fe-Mn-C can be reused for multiple cycles; the performance is not significantly reduced in subsequent cycles, and there is no significant metal leaching. Further studies suggested that the radical pathways (superoxide radicals and hydroxyl radicals) were mainly responsible for the degradation of IBP in the Fe-Mn-C/O 3 system. Furthermore, the contributions of the surface functional groups, doped atoms, and delocalized π electrons of Fe-Mn-C to the decomposition of ozone and the formation of reactive species were identified by correlation analysis between the catalytic ozonation rate and the physiochemical properties of Fe-Mn-C to clarify the mechanism underlying the improved performance. [ABSTRACT FROM AUTHOR]

To recognize and remove targeted organic and inorganic pollutants simultaneously, a simple and outstanding approach was provided to fabricate hierarchical porous molecule/ion imprinted polymers (M-IIPs) with double specific binding sites, Firstly, λ-cyhalothrin (LC) molecules imprinted polymer foam initiators (MIPFIs) with the average void diameter of 8.0 μm were prepared via a W/O Pickering high internal phase emulsions (HIPEs) template stabilized by vinyl-silica particles (V-SPs). Secondly, based on a pore-filled strategy, adjustable amounts of copper ions (Cu(II)) imprinted polymers (IIPs) were incorporated into the macroporous surface of MIPFIs via atom transfer free radical polymerization (ATRP). Owing to the well-defined hierarchical porous structure, M-IIPs possessed enhanced binding kinetics, and the maximum monolayer adsorption capacities of as-prepared M-IIPs were 193.1 μmol g −1 and 169.9 μmol g −1 towards LC and Cu(II), respectively. The imprinting factor ε was 1.942 for LC, while their relative selectivity coefficients α r for Cu(II)/Zn(II) and Cu(II)/Ni(II) were 6.31 and 4.24 times higher than those of non-imprinted polymers (N-NIPs), illustrating that M-IIPs showed excellent molecular recognition in testing solutions. In the binary solution of LC and Cu(II), an enhanced adsorption capacities towards LC and Cu(II) were observed, indicating the existence of promotion in selective adsorption ability in the case of coexistence of LC and Cu(II). Besides, test of reusability suggested that the M-IIPs could be repeatedly used without any significant loss in binding capacity. Overall, this work not only provided new insights into the fabrication of porous imprinted composites with huge specific surface area and binary function, but also highlighted their application for selective and simultaneous removal of LC and Cu(II). [ABSTRACT FROM AUTHOR]

[Display omitted] • Bimetallic ZIF coated 3D ZnO sensor with Co sensitization were designed for trace H 2 S gas detection. • Co incorporation exhibited an adjustment effect on surface area and the number of basic sites. • The selectivity is greatly improved by synergistic effect of molecular-sieving function and catalytic activity of Co sites. • The successful utilization in pesticide volatile and chicken spoilage monitoring affirmed its application prospect. Using metal–organic frameworks (MOF) materials as a filter membrane is an innovative method to improve the selectivity of gas sensors by adjusting the size of the pores and cavities; however, the active surface and dynamic sensing processes are inevitably negatively affected. A facile but effective strategy was implemented in this work by integrating Co ions as catalysts into the inner three-dimensional ZnO skeleton and outer MOF filter membrane. The appropriate incorporation of Co cations was found to increase the surface area, facilitate the adsorption of oxygen species onto the zeolitic imidazolate framework (ZIF) surface, and promote the catalytic oxidation of H 2 S. In the optimised gas sensor, an enhanced response of H 2 S (260 to 5 ppm) and a low detection limit (70 ppb) at 180 °C were obtained because of the catalytic action of appropriate amounts of Co. In addition, beyond the molecular sieve effect to exclude interference from larger gas molecules, the incorporation of Co catalysts can adjust the number of base sites in the ZIF filter (from 1.592 to 3.325 mol/g), which further assists in avoiding basic-type interference from gas molecules with smaller kinetic diameters. As a result, a 130-fold increase in H 2 S selectivity (among various interfering gases) and a 54-fold increase (compared to the control sensor without Co) were obtained. Moreover, the sensor was demonstrated to be a powerful platform for assessing trace amounts of H 2 S in pesticide volatile gas identification and protein food quality evaluation. [ABSTRACT FROM AUTHOR]

[Display omitted] • Phase transformation was achieved via an insertion reaction with additive ZnBr 2. • Nonlumi nescent Cs 4 PbBr 6 were transformed to green Zn-doped CsPbBr 3 /Cs 4 PbBr 6 NCs. • The transformed Zn-doped CsPbBr 3 /Cs 4 PbBr 6 NCs exhibited high PL QY of 77.5%. • The transformed NCs based EL LED was fabricated with a record EQE of 3.2%. Zero-dimensional (0D) perovskites have attracted a great deal of attention over the last few years due to their fascinating properties. However, their application in electroluminescent (EL) Light-emitting diodes (LEDs) is limited and suffering from extremely low device performance. Herein, the nonluminescent Cs 4 PbBr 6 nanocrystals (NCs) were successfully transformed to highly luminescent Zn-doped CsPbBr 3 /Cs 4 PbBr 6 NCs via an insertion reaction with ZnBr 2 , which changed the atomic molar ratios of NCs and promoted the formation of CsPbBr 3. In this reaction, the Zn2+ ions provided by ZnBr 2 together with the Pb2+ ions can occupy the B-site due to the similar ion radius. The extra Br- ions not only can facilitate the transformation process, but also can passivate the surface defects of the NCs, resulting in high photoluminescence quantum yield (PL QY) of 77.5%. Furthermore, as-synthesized Zn-doped CsPbBr 3 /Cs 4 PbBr 6 NCs were used as emitters to fabricate EL LEDs. The device achieved the maximum current efficiency of 9.8 cd/A and a peak external quantum efficiency of 3.2%, which is the best performance of the CsPbBr 3 /Cs 4 PbBr 6 based LEDs. This reveals the great application potential of CsPbBr 3 /Cs 4 PbBr 6 NCs as EL emitters in LEDs. [ABSTRACT FROM AUTHOR]

[Display omitted] • The PLQYs of CsCdBr 3 NRs are improved from ~0 to 57% by PbBr 2 doping. • The optimized perovskite NRs show pure-blue emission located at 459 nm. • The optimized NRs based LEDs achieved the maximum brightness of 225 cd m−2. One-dimensional (1D) semiconductor nanorods (NRs) are very promising materials for light-emitting diodes (LEDs) due to their unique optoelectronic properties, while the research on 1D perovskite NRs is relatively rare. Herein, the 1D CsCdBr 3 perovskite NRs were synthesized by simple thermal injection method, in which the [CdX 6 ]4- octahedra sharing opposite faces can form infinite linear chains along the c axis. But their low photoluminescence quantum yields (PL QYs) limit their application in LEDs. To improve the optoelectronic properties of CsCdBr 3 NRs, the PbBr 2 is chosen as the dopant to synthesize the Pb2+ doped CsCdBr 3 perovskite NRs. When the molar ratio of PbBr 2 :CdBr 2 is 0.25, the perovskite NRs with the PL QYs of 48% and pure-blue emission centered at 459 nm were obtained. Furthermore, the optimized NRs were used as the emissive layer to fabricate a perovskite LED that is the only one blue perovskite LED based on 1D NRs. This device shows bright pure-blue emission with good spectral stability, suggesting that the 1D perovskite NRs are good choice to achieve next-generation lighting and display. [ABSTRACT FROM AUTHOR]

[Display omitted] • Lanthanide acetate promoted CsPbCl 3 NWs were firstly synthesized. • Effect of lanthanide and AcO− ions in the formation of CsPbCl 3 NWs was demonstrated. • CsPbCl 3 NWs with low trap density and high carries separation efficiency were realized. • Self-powered UV photodetector of CsPbCl 3 NWs was fabricated for the first time. Recently, photodetectors based on perovskite nanomaterials have attracted considerable attention in the visible spectral region owing to their large absorption coefficients, long diffusion lengths and high optical gains. However, the fabrication of self-powered visible-blind ultraviolet (UV) photodetectors is still challenging for the perovskite nanomaterials. This work developed the self-powered UV photodetector based on the Eu(AcO) 3 promoted CsPbCl 3 nanowires (NWs), enabled by the great separation efficiency of electron-hole pairs and high electron mobility of the one-dimentional (1D) morphology of perovskite materials. The perovskite CsPbCl 3 NWs were synthesized by a modified hot-injection method with assistant of Eu(AcO) 3 additive. As supported by the experimental investigations and DFT calculations, the adsorption of Eu3+ and AcO− ions to the surface of perovskite not only promotes the anisotropic growth of perovskite in (2 0 0) orientation, but also efficently passivates the halide defect of the perovskite nanomaterials. Moreover, the self-powered UV photodetector based on the Eu(AcO) 3 promoted CsPbCl 3 NWs displays a high responsivity of 398 mA W−1, detectivity up to 3.3 × 1011 Jones and fast response speed (24 ms) at 360 nm without external bias. The responsivity and detectivity of the device based on CsPbCl 3 NWs are improved 8 and 205 times, comparing with the device based on bare CsPbCl 3 NCs without passivation, respectively. In addition, the detectivity is comparable to some previous reports about perovskite NC-based UV photodetectors with additional bias. Our findings demonstrate the promising potential of 1D perovskite NWs for developing the next-generation self-powered UV photodetectors. [ABSTRACT FROM AUTHOR]

[Display omitted] • The KPF 6 as a bifunctional additive is introduced into the perovskite layer. • The function of KPF 6 on crystal growth and device performance is investigated. • The KPF 6 can promote crystallization and heal ionic defects of perovskite films. • The optimized device shows a champion PCE of 22.04% and remarkable stability. High crystallization quality and low defect state density of perovskite films are essential for high-performance devices. Herein, we develop a facile and effective method using potassium hexafluorophosphate (KPF 6) to fabricate perovskite solar cells (PSCs) with highly improved power conversion efficiency (PCE) and outstanding stability. The corresponding mechanisms of the improved crystallization process, grain boundaries (GBs) passivation, and internal ionic defect passivation of the perovskite films are systematically studied. The results indicate that the introduced PF 6 − can promote crystallization by increasing fully coordinated intermediate groups in the perovskite solution and compensate for halide vacancies, which can modify ionic point defects in the perovskite films, resulting in reduced non-radiative recombination. Meanwhile, K+ ions are predominantly distributed at the GBs, which not only benefits the device efficiency but also significantly reduces the hysteresis due to the passivation effect. The champion passivated device presents a PCE of 22.04%, with a significantly improved PCE of around 16% compared with that of the control device (18.99%), retaining 80% of its initial PCE after 1000 h of light soaking without any encapsulation. Our work provides a defect passivation method for further improving both the PCE and stability of PSCs and can also be extended to other devices. [ABSTRACT FROM AUTHOR]

Design synthesis of hierarchical porous S-doped C 3 N 4 tube bundles/graphene nanosheets composite for simultaneous and individual detection of ultra-trace Cd2+, Pb2+ and Hg2+. [Display omitted] • Hierarchical porous S-doped C 3 N 4 tube bundles/graphene composite was synthesized. • Simultaneous and individual ultra-trace detection of Cd2+, Pb2+ and Hg2+ were studied. • Low limit of detection, high sensitivity and broad linear range were realized. • Ultra-trace detection mechanism of the proposed sensor was explained. In this paper, the synergistic effect between sulfur-doped C 3 N 4 tube bundles (STB) with hierarchical pores and graphene nanosheets (Gs) is beneficial for ultra-trace heavy metal ions (HMIs) detection and makes STB/Gs composite a promising sensitive electrochemical sensor for HMIs detection. The excellent trace HMIs detection performance was attributed to the adsorption of hierarchical porous tube bundle structure and the increasing of active sites by S atom doping. Firstly, the hierarchical porous STB/Gs composite used in electrochemical sensor was successfully prepared by hydrogen bond supramolecular self-assembly, evaporation-induced drying and electrostatic assembly methods. Also, under optimized conditions, the sensitivities were 19.87, 44.77 and 29.51 μA/μM and the limit of detection were 1.17, 0.38 and 0.61 nM for simultaneous detection of Cd2+, Pb2+ and Hg2+. The sensitivities were 10.13, 21.68 and 15.71 μA/μM and the limit of detection were 2.30, 0.78 and 1.15 nM for individual detection of Cd2+, Pb2+ and Hg2+. Little interference effects from other co-existing ions allowed the sensor to work in natural water environment for practical application. This method of STB/Gs composite might show utility for constructing highly sensitive electrochemical sensors for the trace detection of heavy metal ions. [ABSTRACT FROM AUTHOR]

Design synthesis of hierarchical porous S-doped C 3 N 4 tube bundles/graphene nanosheets composite for simultaneous and individual detection of ultra-trace Cd2+, Pb2+ and Hg2+. [Display omitted] • Hierarchical porous S-doped C 3 N 4 tube bundles/graphene composite was synthesized. • Simultaneous and individual ultra-trace detection of Cd2+, Pb2+ and Hg2+ were studied. • Low limit of detection, high sensitivity and broad linear range were realized. • Ultra-trace detection mechanism of the proposed sensor was explained. In this paper, the synergistic effect between sulfur-doped C 3 N 4 tube bundles (STB) with hierarchical pores and graphene nanosheets (Gs) is beneficial for ultra-trace heavy metal ions (HMIs) detection and makes STB/Gs composite a promising sensitive electrochemical sensor for HMIs detection. The excellent trace HMIs detection performance was attributed to the adsorption of hierarchical porous tube bundle structure and the increasing of active sites by S atom doping. Firstly, the hierarchical porous STB/Gs composite used in electrochemical sensor was successfully prepared by hydrogen bond supramolecular self-assembly, evaporation-induced drying and electrostatic assembly methods. Also, under optimized conditions, the sensitivities were 19.87, 44.77 and 29.51 μA/μM and the limit of detection were 1.17, 0.38 and 0.61 nM for simultaneous detection of Cd2+, Pb2+ and Hg2+. The sensitivities were 10.13, 21.68 and 15.71 μA/μM and the limit of detection were 2.30, 0.78 and 1.15 nM for individual detection of Cd2+, Pb2+ and Hg2+. Little interference effects from other co-existing ions allowed the sensor to work in natural water environment for practical application. This method of STB/Gs composite might show utility for constructing highly sensitive electrochemical sensors for the trace detection of heavy metal ions. [ABSTRACT FROM AUTHOR]

[Display omitted] • Lead-free 0D K 3 SbCl 6 perovskite nanocrystals are firstly synthesized. • Mn2+ ions doped 0D K 3 SbCl 6 perovskite nanocrystals are successfully synthesized. • The white emission is realized in Mn2+-K 3 SbCl 6 perovskite nanocrystals. • The WLED based on Mn2+- K 3 SbCl 6 perovskite NCs with different CCT are realized. In recent years, the lead-free zero-dimensional (0D) perovskite nanocrystals (NCs) with isolated octahedral structure have attracted wide attentions due to their unique photoelectric properties, such as the excellent absorption cross-sections, large exciton binding energy and low carrier mobility. However, the emitting wavelength of the lead-free 0D perovskite NCs can only be modulated in the green and blue spectral region. Until now, how to realize the red and white emission in the lead-free 0D perovskite NCs is still a challenge. In this work, the lead-free 0D K 3 SbCl 6 perovskite NCs were firstly developed by the hot injection synthesis method. Through controlling the synthetic temperature, the as-prepared NCs exhibit the blue emission centered at 440 nm with the highest photoluminescence quantum yield (PLQY) of 22.3%. Furthermore, the Mn2+ ions were further doped into 0D lead-free K 3 SbCl 6 perovskite NCs, leading to the additional red light emission attributed to the intrinsic transition (4T 1 −6A 1) of Mn2+ ions. By controlling the Mn2+ ion doping concentration, the white light emission with PLQY of 37.2% was realized. Finally, the white light emitting devices (WLEDs) with the Commission Internationale de L'Eclairage 1931(CIE) of (0.29, 0.28), (0.32, 0.30) and (0.35, 0.30) were fabricated by combining the as-prepared Mn2+-K 3 SbCl 6 perovskite NCs with commercial 365 nm UV light chips. The white-light performances of the as-fabricated WLEDs were modulated with tunable correlated color temperature (CCT) from 8173 to 4779 K, which exhibit the high color-rendering index (CRI) more than 80. These results provide the opportunity for the future applications of 0D lead-free perovskite NCs in the lighting and lasing field of LEDs. [ABSTRACT FROM AUTHOR]

• BPA and Cr(VI) can be synergistically and efficiently removed by pristine TiO 2 under visible light. • BPA is excited by visible light to produce electrons. • Pristine TiO 2 acts as a medium of electron transfer. • Cr (VI) reduction due to electrons capture by Cr (VI). • O 2 captures electrons to generate O 2 − for BPA degradation. It is well known that pristine titanium dioxide (TiO 2) is unable to absorb and utilize visible light to degrade organics and reduce hexavalent chromium (Cr(VI)). However, for the first time, this research found that when some organic compounds were mixed with hexavalent chromium, titanium dioxide could not only degrade organic compounds but also reduce hexavalent chromium synchronously under the drive of visible light. The pristine TiO 2 exhibited excellent simultaneity removal of bisphenol A (BPA) and Cr(VI) under visible light irradiation, and almost 100% BPA (50 mg/L) and 100% Cr(VI) (10 mg/L) were removed just within 60 min. Photoluminescence (PL), electrochemical characterization and chemical quenching studies suggested that the reaction mechanism is similar to dye sensitization and electron transfer is responsible for the superior recation. Influences of different reaction conditions were systematically investigated, such as the initial concentration of BPA, the crystal structure of TiO 2 , the catalyst dosage, the initial pH value, and the common inorganic anions. Compared to the rutile, anatase exhibited the most remarkable performance for BPA degradation and Cr(VI) reduction under visible light irradiation. In addition, many other typical refractory organics, such as acetaminophen and tetracycline, have been successfully applied in this photocatalytic system of TiO 2 under visible light irradiation (TiO 2 /Vis system) to synergistically remove self-contamination and Cr (VI) pollution. The findings of the present study provide a valuable insight for sewage treatment, especially the composite wastewater containing organic pollutants and the hexavalent chromium. [ABSTRACT FROM AUTHOR]

• Fe-N-C was prepared and utilized to activate PMS to degrade organic pollutants. • Fe-N-C showed 37.07 and 6.04-fold higher activity to biochar and N-biochar. • Synergistic effects between Fe and N species facilitated the production of ROS. • SO 4 •−, •OH and 1O 2 were identified under the Fe-N-C/PMS treatment. • Fe-N-C showed great separation performance and reusability. This study shows that the simple pyrolysis of mixed sawdust, FeCl 3 and dicyandiamide can produce Fe/N co-doped biochar (Fe-N-C) with great catalytic and separation performances. Fe-N-C had a larger specific surface area (215.25 m2/g), higher defective degree (I D / I G = 0.98) and more active species for PMS activation because of the synergy between Fe and N doping. Furthermore, graphitic N, pyridinic N, Fe-N x , Fe 2 O 3 and Fe0 were identified as the dominant reactive species contributing to the activation of PMS. As a result, the production of reactive oxidizing species (ROS), including both sulfate radical (SO 4 •−), hydroxyl radical (•OH) and singlet oxygen (1O 2), in the Fe-N-C/PMS system was significantly promoted. As a result, Fe-N-C exhibited 37.07 and 6.04-fold higher reaction rates for activating peroxymonosulfate (PMS) to degrade bisphenol A (BPA) relative to the rates achieved by pristine biochar and nitrogen doped biochar, respectively. Moreover, the mineralization rate of BPA by the Fe-N-C/PMS system was 68.9%, which was much higher than that achieved by the pristine biochar/PMS and N-biochar/PMS systems. Chemical-quenching tests further suggested that SO 4 •− and •OH played dominant roles in the degradation of BPA under acidic and neutral conditions, while 1O 2 played a dominant role under alkaline conditions. Furthermore, the potential of Fe-N-C to be used in practical applications was systematically evaluated in terms of its stability, separability and selectivity to organics; the effect of operating parameters was also studied. Generally, our study highlighted the great potential of Fe/N co-doped biochar and provided valuable insight into the synthesis of highly efficient carbon-based catalysts for environmental applications. [ABSTRACT FROM AUTHOR]

• Reversible electrochromism of WO 3 :Yb3+, Er3+ inverse opal was obtained. • Upconversion emission of WO 3 :Yb3+,Er3+ was reversibly modified by electrochromism. • Upconversion emission modification shows excellent repeatability and stability. • Optical date writing and reading out were obtained in WO 3 :Yb3+, Er3+ inverse opal. Reversible modulated upconversion luminescence exhibits an application potential as the photo-switch, fingerprint acquisition, anti-counterfeiting and optical storage devices. It is found that the photochromism and thermochromism could be applied to modify the upconversion luminescence. However, the electrochromism induced reversible upconversion luminescence modulation was not reported. Here, the WO 3 :Yb3+, Er3+ inverse opal was prepared by the template approach, and its electrochromism property was investigated. The color changing of WO 3 :Yb3+, Er3+ inverse opal from a bit yellow to black was observed upon the negative bias voltage stimulation, and its color can be recovered upon the positive bias voltage stimulation. For the first time, the electrochromism induced reversible upconversion luminescence modulation of WO 3 :Yb3+, Er3+ inverse opal was observed, exhibiting a high modulation degree (100%). In addition, the reversibly modulated upconversion luminescence exhibited excellent repeatability and stability by alternating stimulation between negative bias voltage and positive bias voltage. The present results open up a new channel to modulate the upconversion luminescence of materials, exhibiting the application potential in the switch, anti-counterfeiting and optical storage devices. As an instance, the application potential of WO 3 :Yb3+, Er3+ inverse opal was described as an optical storage medium, and the optical date writing and reading out were obtained in the electrochromic WO 3 :Yb3+, Er3+ inverse opal. [ABSTRACT FROM AUTHOR]

• Nitrogen-doped biochar was prepared from sawdust and different nitrogen precursors. • The catalytic activity of N-biochar relies heavily on the preparation conditions. • The optimal catalyst exhibited excellent performance on the activation of PMS. • The catalytic system can work effectively at a wide pH range and real water matrix. • SO 4 −, OH and 1O 2 were responsible for the degradation of the organic species. The fabrication of low-cost, high-performance and environmentally friendly carbon-based catalysts capable of activating peroxymonosulfate (PMS) for wastewater treatment applications is still a challenge. In this work, a novel nitrogen-doped biochar (N-biochar) was prepared through a facile one-step calcination method using sawdust and different organic nitrogen-containing compounds as starting materials. It was found that the catalytic activity of the N-biochar relies heavily on the type of nitrogen precursor, the relative amount of sawdust to nitrogen precursor, and the calcination temperature. Different types and amounts of the nitrogen precursor mainly affect the content of total nitrogen and pyridinic nitrogen, and the calcination temperature mainly affects the content of graphitic nitrogen in the N-biochar. Based on a systematic comparison, an optimized N-biochar (N-C-d-4-800) with a higher content of graphitic and pyridinic N, rich defects, larger SSA and porous structure was obtained, and exhibited a superior catalytic activity for activating PMS to oxidize various organic pollutants, such as bisphenol A (BPA), phenol, acetaminophen (AAP) and sulfamethoxazole (SMX). Moreover, the N-C-d-4-800/PMS system can work effectively at a wide pH range and high salinity conditions, despite the background of the real water matrix. The present study highlights the enormous potential of the novel N-biochar prepared from sawdust for wastewater remediation applications. [ABSTRACT FROM AUTHOR]

• Large-scale and low-cost synthesis of functional sorbents by vapor condensation induced NSEs is proposed. • Effects of reaction conditions and confined space on size, morphology, and yield of product are investigated. • Si-NH 2 and Si-SH illuminate maximum sorption capacity of 245 mg g−1 and 72 mg g−1 for Pb(II), respectively. • The uptake mechanism based on chemisorption and electrostatic interaction is suggested. Effective removal of Pb(II) is a pressing global issue for both drinking water and wastewater purification. In this work, the large-scale and low-cost synthesis of two functional silica sorbents by vapor condensation induced water-in-oil (W/O) nanoemulsions (NSEs) is proposed, and the obtained high quality sorbents are applied for rapid removal of Pb(II). Tetraethoxysilane (TEOS) is diffused into the droplet of NSEs reactor, and then naked silica spheres are generated by hydrolysis and condensation at room temperature. The effects of the reaction conditions and confined space, including the stability, pumping time of water-soluble gas, and condensing time etc. on the size, morphology, and yield of main product are investigated, and the possible formation mechanism is demonstrated. Furthermore, functional silica sorbents with defined surface chemistry (i.e. Si-NH 2 and Si-SH) are also synthesized via as-prepared NSEs systems. Finally, attributed to the inherent amino and mercapto terminal groups, Si-NH 2 and Si-SH illuminate the maximum sorption capacity of 245.7 mg g−1 and 72.16 mg g−1 for Pb(II), respectively. Surface charge does not play a significant role in Pb(II) capture by Si-NH 2 , while chemisorption and electrostatic interaction both contribute to uptake performance of Si-SH. NSEs formed by condensation of water vapor do not need violent stirring and strict component proportion, which is an alternative and potential strategy to synthesize functional sorbents. [ABSTRACT FROM AUTHOR]