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Cellulosic paper-based electrode materials have attracted increasing attention in the field of flexible supercapacitor. As a conductive polymer, polyaniline exhibits high theoretical pseudocapacitive capacitance and has been applied in paper-based electrode materials along with cellulose fibers. However, the stacking of polyaniline usually leads to poor performance of electrodes. In this study, metal-organic coordination polymers of zirconium-alizarin red S and zirconium-phytic acid are applied to modulate the polyaniline layer to obtain high-performance cellulosic paper-based electrode materials. Zirconium hydroxide is firstly loaded on cellulose fibers while alizarin red S and phytic acid are introduced to regulate the morphology of polyaniline through doping and coordination processes. The results show that the introduction of dual coordination polymers is effective to regulate the morphology of polyaniline on cellulose fibers. The performances of the paper-based electrode materials, including electrical conductivity and electrochemistry, are apparently improved. It provides a promising strategy for the potential development of economical and green electrode materials in the conventional paper-making process. [Display omitted] [ABSTRACT FROM AUTHOR]

Lanthanide coordination polymer nanoparticles (LML-Eu3+-GMP CPNPs) were fabricated as a ratiometric fluorescence sensor for real-time and visual assays of tetracycline (TC). The LML-Eu3+-GMP CPNPs were prepared by spontaneous self-assembly of Eu3+, luminol (LML) and guanosine 5′-monophosphate (GMP) at room temperature, which only emitted blue fluorescence dominated by LML, and no red characteristic fluorescence of Eu3+ was observed. In the presence of TC, TC can trigger the antenna effect (AE) and inner filter effect (IFE), the blue fluorescence of LML-Eu3+-GMP CPNPs is quenched by TC via IFE, and the red characteristic fluorescence of Eu3+ can be turned on through AE. When sodium citrate (Cit) is added to the sensing system, it can further enhance the red fluorescence of Eu3+. The dual-ligand CPNP sensor has a rapid fluorescence response, noticeable fluorescence color change, good selectivity, and high sensitivity with a detection limit of 3.4 nM. It was successfully applied to detect TC in honey, milk, lake water and tap water. Meanwhile, the portable smartphone and test paper were applied to develop POCT devices for real-time and visual detection of TC, which could offer a promising application for real-time and semiquantitative assays of TC. [Display omitted] • A ratiometric fluorescence sensor based on analyte-triggered antenna effect and inner filter effect. • Two recognition units for the ratiometric fluorescence sensor. • POCT devices for real-time and visual detection of tetracycline. • Visual and ultrasensitive detection of tetracycline in food and water samples. [ABSTRACT FROM AUTHOR]

[Display omitted] Two novel luminescent MOFs, namely, {[Zn 2 (TCA)(BPPB)(DMA)(OH)]·2DMA} n (DZU-115) and [Zn(HTCA)(BPPB) 0.5 (DMA)] n (DZU-116), have been successfully synthesized. These MOFs were crafted using a combination of 4,4′,4″-tricarboxytriphenylamine (H 3 TCA) and 4,4′-(9,10-anthracenediyl)bis-pyridine (BPPB) as mixed ligands, with solvent modulation as the method of choice. Among them, DZU-115 stands out due to its captivating dual interpenetrating structure. This structure enables DZU-115 to exhibit a unique fluorescence response when stimulated by DMF, which can be visually observed as a change in fluorescence color on filter paper. Two new luminescent MOFs, namely, {[Zn 2 (TCA)(BPPB)(DMA)(OH)]·2DMA} n (DZU-115), [Zn(HTCA)(BPPB) 0.5 (DMA)] n (DZU-116. DZU, H 3 TCA, BPPB is short for Dezhou University, 4,4′,4″-tricarboxyltriphenylamine and 4,4′-(9,10-anthracenediyl)bis-Pyridine, respectively), were successfully synthesized by solvent adjustment and characterized by single crystal X-ray diffraction. DZU-115 shows a fascinating three dimensional (3D) framework derived from the interlocking of 2D coordination dual-layers, while DZU-116 displays a different 2D layer structure. Due to the interpenetrated structure of DZU-115 that is in favor of the formation of interaction between the host frameworks and DMF molecules, a luminescent color transition from yellow-green to light orange has been found in DZU-115 when exposing the MOF to DMF solvent. Moreover, the DZU-115-based filter paper was also prepared, which is capable of producing visual changes in fluorescent color to identify DMF vapor. Remarkably, the color variation is highly reversible and the light orange color could be further converted back into yellow-green by immersing the material in DMA solvent again. Such a reversible stimuli-response behavior with the apparent luminescence color change indicates the potential application of the MOF as a recognition platform for DMF molecules. This study provides valuable insight into optimizing the performance of MOF by tuning the framework structures, and offers a promising avenue for the development of vapor molecule recognition materials. [ABSTRACT FROM AUTHOR]

In this study, a ratiometric fluorescent probe BCDs-Eu/CMP-cit was developed for the detection of tetracycline (TC) in food samples by simply mixing blue fluorescent carbon quantum dots (BCDs) and cytidine monophosphate (CMP)/europium coordination polymer nanoparticles (Eu/CMP-cit CPNs) together. In this ratiometric sensor, the emission of BCDs at 465 nm gradually decreased and that of Eu/CMP-cit CPNs at 620 nm significantly increased with the sequential addition of TC upon being excited at 380 nm, accompanyed by a remarkable fluorescence color change from bright blue to red. It was worth mentioning that both of the two components in BCDs-Eu/CMP-cit nanosystem were employed as response signals with different fluorescent signal output. Hence, the sensitivity to TC is greatly enhanced without being affected by other potentially interfering substances. Under the optimized conditions, a good linear relationship between the concentration of TC from 0.05 to 30 μM and the fluorescence intensity ratio of F 620 / F 465 was obtained. The detection limit was calculated to be 8 nM, which was much lower than that of most of the previously published methods. Moreover, this proposed nanosystem was also successfully applied to the assay of TC in food samples, including fish, lamb, beef, chicken, pork, egg, milk and honey, and the recovery rates were even comparable to those obtained from high performance liquid chromatography (HPLC)-based methods. Importantly, a paper-based visual sensor for TC in various food samples was devised by using filter paper embedded with BCDs-Eu/CMP-cit. The distinct fluorescent color changing from bright blue to red of the filter paper with different concentrations of TC demonstrated a great potential of as-prepared ratiometric fluorescent probe for the visual detection of TC in complicated real samples. • Sensitive ratiometric fluorescent probe for tetracycline detection was constructed. • The probe was simple in design, rapid in response and cost-effective. • The dramatic fluorescent color change displayed the high sensitivity of this probe. • Paper-based visual sensor was successfully applied in real complex food samples. [ABSTRACT FROM AUTHOR]

Three new CdII coordination polymers (CPs) based on a new flexible large π-electron-rich bis(pyridinyl-imidazole) ligand 9,10-bis((2-(pyridin-2-yl)-1 H -imidazole-1-yl)methyl)anthracene (bpima) have been synthesized under solvothermal conditions using a mixed-ligand strategy: {[Cd(bpima) 0.5 (nda)(H 2 O)]·DMF} (CP 1), {[Cd(bpima) 0.5 (oba)]·DMF·2H 2 O} (CP 2), {[Cd(bpima) 0.5 (ipa)(H 2 O)]·DMF·2H 2 O} (CP 3), (H 2 nda = naphthalene-1,4-dicarboxylic acid; H 2 oba = 4,4′-oxydibenzoic acid and H 2 ipa = 5-(tert -butyl)isophthalic acid). CP 1 and CP 2 both feature 2D layer structures with hcb and sql topology, respectively. CP 3 shows 1D ladder-like double-chain structure. In additional, luminescent properties of CP 1 and CP 3 have been systematically investigated and demonstrated multi-responsive luminescent sensitivities. Two compounds can be used for detection of Cr 2 O 7 2− and 2,4,6-trinitrophenol (TNP) with high sensitivity (High quenching efficiency K sv : for Cr 2 O 7 2−: 5.07 × 104 M−1 for CP 1 and 7.38 × 104 M−1 for CP 2 ; for TNP: 4.87 × 104 M−1 for CP 1 and 5.13 × 104 M−1 for CP 2. low detection limit values: for Cr 2 O 7 2−: 0.56 μM for CP 1 and 0.38 μM for CP 2 ; for TNP: 0.63 μM for CP 1 and 0.52 μM for CP 2) and as well as good recyclability. In addition, the sensing mechanism for Cr 2 O 7 2− and TNP is also discussed by experimental studies and theory calculations, which was attributed to the co-existence of competitive absorption (CA), fluorescence resonance energy transfer (FRET) and photoinduced electron transfer (PET) progress for TNP and CA progress for Cr 2 O 7 2−, respectively. Moreover, simple fluorescent filter paper based on CP 1 has been developed to achieve detection of Cr 2 O 7 2− and TNP via the unaided eye, which has great potential for practical applications. • Three new anthracene-based CdII-CPs with different structures were synthesized. • Two CPs both possess high sensitive detectability in sensing Cr 2 O 7 2− and TNP in water. • CA, PET and FRET progress contributed to luminescence quenching processes. [ABSTRACT FROM AUTHOR]

• Compound 2 is 1-dimensional and compounds 3 and 4 are 2-dimensional. • The degradation efficiency of compounds 3 and 4 for TC can reach more than 94 %. • h+ is the main active substance in TC degradation process. • The degradation efficiency of compounds 3 and 4 can still reach more than 85 % after four cycles of degradation. • Carboxylic acid ligand is formed by hydrolysis of cyanide group under acidic condition and high temperature. In this paper, ligand L1(4-cyano-1-[4-(4-cyanopyridin-1-ium-1-yl)butyl]pyridin-1-ium) was synthesized, and reacted with ammonium molybdate and different metal salts to obtain four different compounds with novel structures, {[L1']·[C 10 H 8 N 2 ]·[CrMo 6 (OH) 7 O 17 ]} n (1), {[(L1') 0.5 ·Mn·O·(C 10 H 8 N 2)]·[Mo 8 O 26 H 8 ] 0.5 ·H 2 O} n (2), {(L1') 1.5 ·[TbMo 8 O 27 H 2 ]·(H 2 O) 4 } (3) and {(L1') 1.5 ·[CeMo 8 O 27 H 2 ]·(H 2 O) 3 } (4). They were characterized by IR, UV–Vis absorption spectroscopy, thermogravimetric analysis and single crystal X-ray analysis. Compound 1 is a 0-dimensional compound, compound 2 is a 1-dimensional chain compound, and compounds 3 and 4 are 2-dimensional compounds. Simultaneously, compounds 1–4 were found to possess photocatalytic degradation of TC by preliminary experimental investigations. [Display omitted] In this paper, ligand L1 (4-cyano-1-[4-(4-cyanopyridin-1-ium-1-yl)butyl]pyridin-1-ium) was synthesized, and four novel compounds were obtained by the reaction of ligand L1 with ammonium molybdate and different metal salts. Compound 1 is a supramolecular compound, compound 2 is a one-dimensional chain compound, and compounds 3 and 4 are both two-dimensional compounds. Compounds 1–4 were characterized by XRD, IR, thermogravimetric analysis and single crystal X-ray diffraction. Simultaneously, we investigated the photocatalytic degradation properties of compounds 1–4, and the results showed that compounds 3 and 4 had excellent photocatalytic degradation properties against pollutant TC. We found that compound 3 had the highest degradation efficiency when pH=11 and dosage was 15 mg/L. The degradation efficiency of compound 4 was the highest when pH=9 and dosage was 10 mg/L. h+ is the main active substance in TC degradation process. In addition, we found that compounds 3 and 4 have good cyclic properties, and the degradation efficiency can still reach more than 85 % after four cycles of degradation. [ABSTRACT FROM AUTHOR]

[Display omitted] • CP 1 synthesized in this paper has strong stability. • A binary intelligent logic gate device was successfully constructed by chemical input of AMB and FLU. • A portable visual test paper with simple operation and fast response was prepared. In recent years, due to the abuse of antibiotics, nitro explosives and pesticides, which have caused great harm to the environment and human health, social concerns have prompted researchers to develop more sensitive detection platforms for these pollutants. In this paper, a novel two-dimensional Zn (II) coordination polymer, [Zn(L) 0.5 (1,2-bimb)]·DMF (1), [H 4 L=[1,1′:4′,1′'-terphenyl]-2, 2′',4, 4′' −tetracarboxylic acid, 1,2-bimb = 1,2-bis(imidazol-1-ylmethyl)benzene] was synthesized using a hydro-solvothermal method. Among commonly used organic solvents, 1 exhibits significant stability. Fast and efficient fluorescence response can be achieved for tetracycline (TET), 4-nitrophenol (4-NP), fluazinam (FLU), and abamectin benzoate (AMB) with low detection limits. A binary intelligent logic gate device with FLU and AMB as chemical input signals is successfully constructed, which provides a new idea for biochemical detection. In addition, a portable visual test paper has been prepared, which has high sensitivity, good selectivity, and simple operation. It can be used for rapid detection of pollutants in daily life and has broad application prospects. Finally, a detailed discussion was conducted on the fluorescence sensing mechanism of 1 for detecting TET, 4-NP, AMB and FLU. [ABSTRACT FROM AUTHOR]

The investigation of dihydrazone Schiff base ligands as potential and appropriate chemosensors for fast, simple and portable detection of Cd(II) ion is reported. [Display omitted] • Dihydrazone Schiff bases – chemosensors for Cd(II) ion. • Photoluminescence on/off effect upon coordination of Schiff bases with Cd(II). • Fluorescence of ligands is enhanced when Cd(II) is added to test paper strips. Finding suitable probes for the rapid and sensitive detection of highly toxic pollutants is an urgent challenge for our environment. In this paper, three Schiff base ligands (H 2 L1 = 2 , 6-diacetylpyridine bis(isonicotinoylhydrazone), H 2 L2 = 2 , 6-diacetylpyridine bis(nicotinoylhydrazone) and H 2 L3 = 2 , 6-diacetylpyridine bis(picolinoylhydrazone)) have been used as potential chemosensors for Cd2+ detection. The corresponding Cd(II) complexes were prepared and it was found that the chemosensors coordinate similarly to the Cd2+ ion, eventually exhibiting different photoluminescent responses. Coordination of H 2 L1 and H 2 L2 to the Cd(II) ion results in a "turn-off" photoluminescence, while coordination of H 2 L3 show an excellent example of a "turn-on" mode of photoluminescence. Moreover, all three studied ligands are appropriate candidates for a fast, simple and portable method of Cd(II) ion detection. [ABSTRACT FROM AUTHOR]

Pollution-free and low-cost bifunctional catalysts are important part for hydrogen production. In this paper, composite catalysts Ni 0.2 Mo 0.8 N/CeO 2 -x/NF (x = n(Ce)/n(Ni)- 0.1, 0.3, 0.5) were synthesized via hydrothermal and calcination methods on foam nickel (NF). Experimental results show that the composites have better properties than CeO 2 /NF, Ni 0.2 Mo 0.8 N/NF and MoN/CeO 2 /NF. The electrochemical properties of the composites depend on the ratio of nickel and cerium. A proper proportion of nickel leads to a larger specific surface area, increased electron capacity, more active sites, and better overall performance. Among the tested composites, Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF exhibits the best electrochemical performance and is well-suited for catalyzing the hydrogen evolution reaction (HER) and urea oxidation reaction (UOR). For HER, the potential is −120 mV @ 100 mA cm−2. And for UOR, the UOR potential is only 1.462 V @ 100 mA cm−2. A two-electrode electrolyzer of Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF|| Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF was also built. Overall urea splitting (OUS) is 1.672 V @ 100 mA cm−2, which is 187 mV smaller than overall water splitting (OWS, 1.859 V). Therefore, Ni 0.2 Mo 0.8 N/CeO 2 has potential application in hydrogen production from urea-rich wastewater electrolysis. [Display omitted] • Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF was synthesized for water-urea electrolysis to produce hydrogen energy. • Ni 0.2 Mo 0.8 N/CeO 2 -0.3/NF exhibited excellent catalytic activity towards both HER and UOR. • Compared with pure water splitting, the efficiency of the catalyst is higher with the aid of urea. [ABSTRACT FROM AUTHOR]

[Display omitted] • A water-stable new luminescent Cd(Ⅱ) coordination polymer (LCP 1) was constructed. • LCP 1 can be used as a fluorescent sensor for the detection of vanillin. • The limit of detection of vanillin was as low as 1.41 μM. • Paper-based sensor for visual recognition detection of vanillin was developed. Establishing a simple and rapid method for the detection of vanillin is necessary and significant. Herein, we synthesized a new 3D luminescent coordination polymer (LCP) [Cd(4-bmnpd)(BA)](1) {4-bmnpd = N , N ′-bis(4-methylpyridine-4-yl)-2,6-naphthalene dicarboxylamide, H 2 BA = 2[(4-carboxymethyl phenoxy) benzoic acid]} with a semi-rigid bis-pyridine-bis-amide and dicarboxylate mixed ligands under solvothermal condition. X-ray diffraction analysis revealed that 1 is a 5-connected 3D framework structure. The effect of solvents and pH on the luminescence intensity of 1 was investigated. LCP 1 was stable and the luminescence intensity almost unchanged in different solvents as well as in the pH range of 3–11. Fluorescence sensing studies showed that LCP 1 can detect vanillin by fluorescence quenching and has good anti-interference properties toward the substances commonly found in infant formula. The limit of detection of vanillin was as low as 1.41 μM. The fluorescence quenching mechanism of LCP 1 was analyzed in detail. In addition, we developed cheap paper-based sensor for visual recognition detection of vanillin. [ABSTRACT FROM AUTHOR]

• A stable, highly selective and sensitive lanthanide sensor towards toxic pollutant of formaldehyde is designed. • The sensor was fabricated into uniform microspheres, and further molded into smart detection device of test paper for naked eye detection of formaldehyde. • The sensing mechanism is revealed by luminescence lifetimes comparison. Formaldehyde is toxic to human body and animals, thus sensing of low concention of formaldehyde is urgent. A new uniform luminescent and stable lanthanide microsphere of europium complex sensor (Eu-MTFBA) towards formaldehyde in water is developed. Single crystal analysis shows the microsphere has a one dimensional (1D) coordination polymer structure. The sensor was further molded into smart detection device of test paper, which is applied to detect formaldehyde through naked eyes. Furthermore, the sensing mechanism is also revealed by luminescence lifetimes measurement. A stable, highly selective and sensitive lanthanide sensor towards toxic pollutant of formaldehyde is designed. The sensor was fabricated into uniform microspheres, and further molded into smart detection device of test paper for naked eye detection of formaldehyde. The sensing mechanism is revealed by luminescence lifetimes comparison. [Display omitted] [ABSTRACT FROM AUTHOR]

To screen out suitable electrode materials and overcome the shortcomings of the existed electrode materials for the application in dye-sensitized solar cells and supercapacitors, NiS 2 /reduced graphene oxide (NiS 2 /rGO) composite material was prepared by a simple one-step hydrothermal method in this paper and applied in the field of both dye-sensitized solar cells and supercapacitors as electrode material. In an electrolyte of 6 M KOH, the NiS 2 /rGO composite material with bilayer capacitance characteristics exhibited a high specific capacitance of 259.20 F g−1 at the current density of 0.6 A g−1, which was significantly higher than that of rGO (188.94 F g−1). Moreover, at a current density of 2 A g−1, the NiS 2 /rGO composite material had 92.85% capacitance retention after 2000 cycles. When applied as counter electrode material for the dye-sensitized solar cells, the NiS 2 /rGO composite material counter electrode exhibited a satisfactory photoelectric conversion efficiency (η) of 3.16% under standard simulated sunlight (AM 1.5 G), which was significantly higher than that of single rGO counter electrode (improved by 90.40%). The NiS 2 /rGO composite electrode material prepared by a simple one-step hydrothermal method is a potential bi-functional composite electrode materials for both dye-sensitized solar cells and supercapacitors. [Display omitted] • NiS 2 /reduced graphene oxide composite was prepared by one-step hydrothermal method. • NiS 2 /reduced graphene oxide exhibits excellent electrochemical performance. • High photoelectric conversion efficiency was obtained for dye sensitized solar cells. • Excellent specific capacitance and durability were obtained for supercapacitors. [ABSTRACT FROM AUTHOR]

• Four new d10 piperazine-bridged-amide-based coordination polymers were structurally directed by metal and carboxylate. • The title complexes can be acted as fluorescent sensors for nitrophenol and nitroaniline with low LOD, high K sv , good anti-interference and recyclable characteristics. • The feasibility of actual sample detection was verified by tap water, river water and wastewater samples. • The visual detection cloth and test paper were also prepared by solid phase deposition method and displayed good practical applicability. Four piperazine-amide-bridged d10 metal-organic coordination polymers, namely, [Zn(L) 0.5 (1,3-BDC)∙H 2 O]∙H 2 O (1), [Cd(L)(1,3-BDC)] (2), [Zn(L) 0.5 (5-MIP) ∙H 2 O]·H 2 O (3), [Cd(L)(5-MIP)] (4) were synthesized by the L ligand [N, N'-bis[(3-pyridin)acrylophenone] piperazine (L)] and two carboxylic acids with Zn/Cd(II) chloride under hydrothermal conditions. The title complexes were characterized by IR spectroscopy, powder X-ray diffraction and single-crystal X-ray diffraction. Complex 1 is a 1D ladder-like structure. Complex 2 is a 3D NaCl type framework. Complexes 3 and 4 are 63 and 44 connected 2D structures. The different structural details of the title complexes directed by caroxylates and the central metals were compared. The complexes 1 – 4 can be used as excellent fluorescent sensors toward nitrophenol (NOP) and nitroaniline (NA) with a low limit of detection and a high quenching constant, and have good anti-interference and recyclable characteristics. The feasibility of actual sample detection was verified by tap water, river water and wastewater samples. Taking complex 3 as an example, the mechanism was also explored by fluorescence lifetime experiment and the UV-visible absorption spectroscopy. The 3 -modified visual detection cloth and test paper were also prepared by solid phase deposition method. Four new piperazine-amide-bridged metal-organic coordination polymers were obtained and used as fluorescent sensors for the detection of nitrophenol and nitroaniline in tap water, river water and wastewater environments. The sensors shows good recyclability, stability and low detection limit. The title-complex-modified detection cloth and test paper were prepared by solid phase deposition method to realize visual detection devices. [Display omitted] [ABSTRACT FROM AUTHOR]

The abnormal concentration of anthrax spore biomarker 2,6-pyridinedicarboxylic acid (2,6-DPA) will seriously affect public health. Therefore, a sensitive and rapid assay for 2,6-DPA monitoring is of vital importance. In this work, novel nano-sized amorphous Eu-NH 2 BDC (amEu-NH 2 BDC) and amorphous Tb-NH 2 BDC (amTb-NH 2 BDC) metal organic frameworks are prepared by adjusting the ratio of metal and ligand, respectively. Both of them exhibit highly sensitive and selective ratiometric fluorescence detection for 2,6-DPA with wider linear range and lower detection limit in aqueous solutions and human serum. Attributed to the coordination effect of 2,6-DPA in triggering the characteristic fluorescence emissions of Eu3+or Tb3+ by replacing coordinated solvent molecules, as evidenced by ultraviolet–visible spectroscopy, the fluorescence lifetimes analysis, thermal gravimetric analysis, Fourier-transform infrared spectroscopy, density functional theory (DFT) simulations and X-ray photoelectron spectroscopy. In addition, the amEu-NH 2 BDC or amTb-NH 2 BDC loaded paper-based microsensors are constructed for real-time and sensitive detection of 2,6-DPA and coupled with a smartphone-assisted visual portable device. [Display omitted] • Novel nano amEu-NH 2 BDC and amTb-NH 2 BDC were obtained by adjusting the ratio of metal and ligand. • The fluorescence of Eu3+ or Tb3+ in amEu-NH 2 BDC or amTb-NH 2 BDC restored in the presence of 2,6-DPA. • Density functional theory calculation verified the mechanism for detecting 2,6-DPA. • A smartphone-based visual paper sensor was successfully detected 2,6-DPA in human serum. [ABSTRACT FROM AUTHOR]

• We report a facile method for the preparation of Ln-MOFs. • The construction by design of MOFs using various multifunctional organic ligands connected through coordination bonds. • Two new materials based on MOFs present excellent adsorption properties of CO 2 over N 2. • These two complexes present excellent good photocatalytic activities for TC under visible light irradiation. Rational design of lanthanide metal-organic frameworks (Ln-MOFs) with high stability is of great significance for multifunctional applications. Ln-MOFs have attracted extensive attention in the field of photocatalysis due to their large specific surface area and strong visible light efficiency. In this paper, two 2D/3D Ln-MOFs with different spatial configurations have been successfully synthesized under solvothermal conditions, namely [La(HL)(H 2 O)] n ·3H 2 O (1), [Er(HL)·3/2(H 2 O)] n ·3/2H 2 O (2), where H 4 L = 5-(bis(3-carboxybenzyl)amino)isophthalic acid. Their structures were determined by X-ray single crystal diffraction analysis, and further characterized by XRD analysis and IR spectroscopy. The complex 1 shows layered structure, which extends into a three-dimensional (3D) supramolecular network by π-π interactions, the complex 2 exhibit 3D network structures with a Schläfli symbol of 412 · 63 topologies, respectively. BET test results showed that there were carboxylic acid groups without coordination in the structure of complex 1, with abundant active sites and higher adsorption activity than complex 2, which would promote the effective contact and reaction between the photocatalyst and tetracycline (TC), thus improving the photocatalytic efficiency of complex 1. Under visible light irradiation, complex 1 showed good photocatalytic degradation of TC, and the degradation rate of TC could reach 75.54% under 120 min. This can be attributed to the effective separation of photogenerated electron-hole pairs and adsorption properties of complex 1. This study provides a new idea for MOFs as an efficient photocatalyst to degrade antibiotic pollutants. In this paper, two 2D/3D Ln-MOFs with different spatial configurations have been successfully synthesized under solvothermal conditions with 5-(bis(3-carboxybenzyl)amino)isophthalic acid. Under visible light irradiation, complex 1 showed good photocatalytic degradation of TC, and the degradation rate of TC could reach 75.54% under 120 min. This study provides a new idea for MOFs as an efficient photocatalyst to degrade antibiotic pollutants. [Display omitted] [ABSTRACT FROM AUTHOR]

Lanthanide luminescence sensors have attracted extensive attention in the detection of 2, 6-pyridinedicarboxylic acid (DPA), the main biomarker of anthrax. In previous reports detecting DPA, luminescence probes may not have high selectivity and high specificity for identification. In the present study, a highly specific and sensitive luminescence probe was synthesized. In this paper, [Tb x Gd 1-x (PBA) 2 NO 3 ·2H 2 O] n is synthesized by solvothermal method using HPBA = 3.5-bis(triazol-1-yl)benzoic acid and Ln (NO 3) 3· 6H 2 O (Ln = Tb, Gd). Through modulating the molar ratio of Tb3+ ions and Gd3+ ions, the distance between Ln3+ ions is changed, leading to a change in the energy transfer from the ligand to Tb3+, which in turn leads to an increase in luminescence intensity. Meanwhile the luminous colour is regulated by the ratio of Tb/Gd, which changes from green to white as the Gd ion gradually increases. The bimetallic ratiometric luminescence sensor realized accurate, high sensitivity (LOD is 1.03 × 10−6 M) and high selectivity detection of DPA. Due to the simple synthesis method and low technical requirements, this work provides a good strategy for the development of simple and effective bimetallic ratiometric luminescence sensors. The coordination polymer (Tb 0.9 Gd 0.1 -PBA) provides specific recognition of DPA and is a fluorescent sensor with high sensitivity, high selectivity and good interference immunity. In addition the lanthanide ion doping method described in this paper allows the development of more multicentre luminescent sensing materials for the large number of available Ln-MOFs. This work will expand the application of Ln-MOFs in chemical sensing and inspire other researchers to explore in this direction. [Display omitted] • The bimetallic lanthanide coordination polymers exhibit high selectivity, fast response, DPA-specific recognition. • The bimetallic lanthanide coordination polymers have low detection limits and high sensitivity to DPA. • Luminescence sensors utilize a two-dimensional decoding map for the precise identification of DPA. • The luminescence colour can be changed by adjusting the molar ratio of Tb3+ to Gd3+. [ABSTRACT FROM AUTHOR]

The escalating concern over the environmental impact of antibiotic residues has spurred significant research efforts toward developing efficient and sustainable removal strategies. Among these, coordination polymers have demonstrated their excellence as candidates for antibiotic elimination from wastewater. Coordination polymers, including metal-organic frameworks (MOFs) and covalent organic frameworks (COFs), include distinctive structural characteristics, large surface areas, and flexible functionality. These characteristics make them very well-suited for adsorption purposes, especially when it comes to removing antibiotics. Additionally, the review highlights the underlying mechanisms of antibiotic adsorption onto coordination polymers, including coordination interactions, electrostatic forces, and π-π interactions. This article offers a thorough summary of the latest advancements in the use of coordination polymers as adsorbents and photocatalysts for the purpose of removing antibiotics. The next sections explore the process of creating, categorising, and altering coordination polymers that are specially designed for the purpose of adsorbing antibiotics and facilitating photocatalytic breakdown. Furthermore, the paper concludes by summarising the current challenges and future prospects in the field of antibiotic eradication through the use of coordination polymers. Finally, this comprehensive review provides a valuable resource for researchers, environmental scientists, and policymakers working to create long-term solutions for reducing the adverse effects of antibiotic residues in water systems. In order to make a contribution to the ongoing efforts to establish coordination polymers as effective and environmentally friendly agents for antibiotic removal, this review contributes by analysing recent advancements and highlighting key considerations. [Display omitted] • Information on coordination polymers addressed. • Different synthesis techniques and types of coordination polymers were discussed. • Adsorptive exclusion of antibiotics by coordination polymers is presented. • Summarization of photocatalytic removal of antibiotics by coordination polymers. • Future perspectives and challenges are discussed for coordination polymers. [ABSTRACT FROM AUTHOR]

• Al/oxidizer composites integrated with energetic coordination polymers as catalyst are prepared. • The ignition and combustion of propellants are enhanced under the synergistic effects of Al/oxidizer interfacial control and the catalysts. • The burning rates of propellants can be well controlled in a wide range and lowered pressure exponent is achieving. The control of burning rate pressure sensitivity is essential for stable and reliable combustion of solid propellants. It has been proved that the combustion behavior of propellants can be effectively tuned by interfacial control of Al/oxidizers. In this work, core-shell Al-based composites, using oxidizers such as ammonium perchlorate (AP) and cyclotetramethylene tetranitramine (HMX) as the shell layer, have been prepared with a well-controlled location of graphene-based carbohydrazide complexes (GO-CHZ-M, M = Co2+ or Ni2+) as the catalysts. The catalysts can be located inside HMX or embedded on the surface of AP particles. The decomposition of AP and HMX could be greatly promoted with a trace amount of catalyst. Under the synergistic effects of Al/oxidizer interfacial control and GO-CHZ-M, the ignition delay time is shortened by >48 % with increased in flame radiation. More importantly, the burning rate (r) and pressure exponent (n) of the solid propellants are effectively regulated in a wide range. In particular, the use of Al@HMX/Co results in a lowered n of 0.29 within 1∼20 MPa compared to 0.79 for the blank reference sample. The agglomeration of Al particles during combustion was also inhibited due to the micro-explosion effect of Al@HMX composites. The innovative approaches of integrating Al/HMX/AP composites and precise catalysis of graphene-based energetic catalysts in solid propellants have successfully achieved, regarding the modulation of the burning rates and pressure sensitivity. Moreover, the effect of catalyst location on the ignition delay and burning rates has also been studied thoroughly and clarified. This paper provides new insight into the regulation of combustion performance of solid propellants, with improved reaction efficiency and maintained energy density. [ABSTRACT FROM AUTHOR]

In this paper, an ultra-small-sized CuO x /GDYO nanozyme in situ grown on ITO glass was rationally synthesized from mixed precursors of graphdiyne oxide (GDYO) and copper based infinite coordination polymer (Cu-ICP, consisting of Cu ions and two organic ligands 3,5-di-tert-butylcatechol and 1,4-bis(imidazole-1-ylmethyl)benzene) via mild and simple electrochemical strategy. On one hand, the preferential electro-reduction of Cu-ICP enabled the formation of ultra-small CuO x with Cu(I) as the main component and avoided the loss of oxygen-containing functional groups and defects on the surface of GDYO; on the other hand, GDYO can also serve as electroless reductive species to facilitate the electrochemical deposition of CuO x and turn itself to a higher oxidation state with more exposed functional groups and defects. This one-stone-two-birds electrochemical strategy empowered CuO x /GDYO nanozyme with superior peroxidase-mimicking activity and robust anchoring stability on ITO glass, thus enabled further exploration of the portable device with availability for point-of-use applications. Based on the organophosphorus pesticides (OPs) blocked acetylcholinesterase (AChE) activity, the competitive redox reaction was regulated to initiate the chromogenic reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) catalyzed by CuO x /GDYO peroxidase-like nanozyme, which laid out a foundation for the detection of OPs (with chlorpyrifos as an example). With a detection of limit low to 0.57 nM, the OPs residues during agricultural production can be directly monitored by the portable device we developed. [Display omitted] • Ultra-small CuO x /GDYO formed via one-stone-two-birds electrochemical strategy. • Synergistic effect between CuO x and GDYO boosts their peroxidase-like activity. • CuO x /GDYO nanozyme in-situ growth on ITO glass is endowed with robust stability. • Nanozymes involved competitive redox reaction is modulated for OPs detection. • Portable device is exploited for colorimetric sensing of OPs in farmland samples. [ABSTRACT FROM AUTHOR]

• A new Co(II)-based coordination polymer {[Co(H 2 L)(dpa)(H 2 O)]·H 2 O} n was synthesized. • Photoelectrochemical and photocatalytic properties for 1 were performed. • The photocatalytic mechanism of 1 was studied. Coordination polymers (CPs) are a special class of multidimensional materials that can be employed for the photocatalytic degradation of antibiotics in wastewater. In this paper, a new Co(II)-based coordination polymer with the molecular formula {[Co(H 2 L)(dpa)(H 2 O)]·H 2 O} n (1), (H 4 L = 1,1′:2′,1″-triphenyltetracarboxylic acid, dpa = 1,2-di(pyridin-4-yl)diazene) was synthesized and characterized. Single-crystal x-ray diffraction results showed that 1 formed a 2D layered structure, which was stacked into a three-dimensional (3D) supramolecular structure through hydrogen-bonding interactions. In addition, the results of the photocatalytic experiments showed that 1 possesses good photocatalytic activity at nitrofurantoin (NFT). The photocatalytic mechanism has been discussed in detail. [ABSTRACT FROM AUTHOR]

[Display omitted] A selenoantimonate (C 4 H 14 N 2) 0.5 Cu 2 SbSe 3 (1) (C 4 H 12 N 2 = 1, 4-butanediamine) was synthesized by solvothermal synthesis using 1, 4-butanediamine as solvent. By single-crystal X-ray diffraction, compound 1 has a two-dimensional (2-D) layered structure composed of a protonated organic amine [(C 4 H 14 N 2) 0.5 ]+ and an anionic layer [Cu 2 SbSe 3 ]- containing the 6-membered rings (6-MR) Cu 2 SbSe 3 and the 10-membered rings (10-MR) Cu 3 Sb 2 Se 5. Solid-state UV-diffuse reflectance analysis showed that 1 has a band gap value of 1.85 eV, indicating its potential semiconducting properties. This paper studied the photodegradation properties of selenoantimonate containing the transition metal Cu for the first time, and found that its degradation rate methylene blue (MB) was 68.5 %. In addition, a series of characterizations were also performed. [ABSTRACT FROM AUTHOR]

[Display omitted] • A novel coordination architecture, {[Co(toua)(4,4′-bpy)].2H 2 O} n (1), constructed using an unexplored polyether carboxylate linker (3,6,9-trioxaundecanedioic acid) and 4,4′-bipyridine. • 1 demonstrated dual sensing capabilities, employing both vapochromic and photoluminescence methods, for detecting ammonia and various amines. • 1 demonstrated the ability to selectively detect ammonia and amine vapors, with eye-detectable color changes and varying response times. • Notably, 1 exhibited a rare occurrence of both "turn-off" and "turn-on" sensing behaviors. This work presents the design, synthesis, and characterization of a new cobalt (II) based coordination architecture, {[Co(toua)(4,4′-bpy)].2H 2 O} n (1); where toua is 3,6,9-trioxaundecanaote and 4,4′-bpy is 4,4′-bipyridine tailored for efficient sensing of ammonia and amines. The formation and identity of 1 was confirmed by elemental analysis, spectroscopic study (FTIR and UV–visible spectroscopy), PXRD, XPS, FESEM, and BET analysis. The colorimetric sensing capability of 1 towards ammonia and various smaller-sized amines in the vapor phase through observable color changes is explored in this study. Their interaction with 1 is elucidated through FTIR, UV–Visible and Fluorescence spectroscopy, FESEM, and TCSPC analysis. The fluorescence sensing experiments demonstrate a remarkable quenching/enhancement effect with the addition of ammonia and various amines, showcasing the compound's sensitivity and selectivity. The quenching/enhancement efficiency follows the order: NH 3 >Ethylenediamine (EDA)>1,3-diaminopropane (DAP)>n-propylethylenediamine (n-PEDA), following the molecular dimensions and steric hindrance surrounding nitrogen atoms. Hydrogen bonds and host-guest interactions, including (C–H)pyridinium⋅⋅⋅N interactions, are identified as the driving forces for the sensing process. Additionally, the paper reveals a rare occurrence of both "turn-off" and "turn-on" sensing behavior for the same compound, showcasing its versatility. The calculated RSD for the fluorometric sensor was found to be 1.03 % calculated from its triplicate readings at 240 nm. Limits of detection (LODs) and Limit of Quantification (LOQs) for NH 3 (0.52 μM, and 1.74 μM) EDA (1.2 μM, and 4.2 μM), DAP (3.1 μM, and 10.5 μM), and n-PEDA (3.3 μM, and 11.2 μM) respectively) underscore the effective sensing capabilities of 1. The robustness of 1 upon exposure to amines was confirmed by PXRD. These findings justify that 1 is a promising vaporchromic probe for the fast and selective detection of ammonia and amines. [ABSTRACT FROM AUTHOR]

This paper introduces a multifunctional air filter with a strong ability to trap and disinfect pathogens and absorb particulate matter (PM), the volatile organic compound (VOC), and CO 2. This study demonstrates a facile and eco-friendly synthesis of copper coordination polymer particle (Cu-CPP)-decorated non-woven fibre filters (Cu-CPP/NWF) via an in situ growth dip-coating method. Their multifunction potentials in air pollution treatment are also assessed. The Cu-CPP/NWF filter media showed a remarkable performance for air treatment, with 100% disinfection efficiency against airborne E. coli bacteria (2 × 106 CFU mL−1) in 45 min, superior PM removal efficiency (quality factor 0.299 Pa−1), excellent p-xylene adsorption capacities (1.19 mmol/g) and high potential CO 2 uptake capacities (19.81 cm3/g). A Cu-CPP can work as an antibacterial agent and an adsorbent component, thus offering many applications. The rational integration of Cu-CPP can substantially enhance the filtration efficiency via electrostatic interaction, while most commercial air purifiers rely on dense fibrous filters. This study provides valuable insight into developing a multifunctional and reusable air filter proven to be a life-saving product for public health protection. [Display omitted] [ABSTRACT FROM AUTHOR]

• Three novel 3D Zn(II) CPs were synthesized and characterized. • There CPs can effective sense enrofloxacin and acetylacetone. • There CPs can be as paper-based sensors for the visual sensing of ENR and ACAC. • The turn-off mechanisms were investigated in detail. Designing efficient and stable non-precious coordination polymers remains a challenge for the luminescent sensing of enrofloxacin and acetylacetone. Three Zn(Ⅱ)-coordination polymers with the formula {[Z n 2 (L)(BTC)(OH)]·H 2 O} n (1), [Zn 1.5 (L)(MIP)(OH)] n (2) and [Zn(L)(DBT)] n (3); L = 2-(2-Pyridin-3-yl-vinyl)-1 H -benzimidazole, H 3 BTC = 1,3,5-benzene tricarboxylic acid, H 2 MIP = 5-methylisophthalic acid, and H 2 DBT = 2,5-dibromoterephthalic acid were hydrothermally synthesized and characterized. 1 reveals an unusual 3D topology, 2 displays a 3D mog framework, while 3 exhibits (4,5)-connected 3D xah framework. 1 ∼ 3 are firstly dual-functional luminescence sensors for detecting enrofloxacin and acetylacetone, expressing high selectivity and sensitivity. Quick and visual detection of enrofloxacin and acetylacetone without any pretreatment is realized by using CP 1 ∼ 3 paper-based sensors. Furthermore, the fluorescence sensing mechanism was discussed in detail. [Display omitted] [ABSTRACT FROM AUTHOR]

• Compounds of the CdBr 2 (H 2 N-(CH 2) n -NH 2) general formula were synthesized. • Crystal structures of 5 of them were determined based on PXRD patterns. • The compounds have polymeric structures with organic-inorganic layers. • The a parameter and thermal stability depend on the number of C atoms. • Odd-even alternation of the decomposition temperature was observed. In this paper, organic-inorganic coordination polymers of the CdBr 2 (H 2 N-(CH 2) n -NH 2) general formula, where n = 4 – 10 and 12, were studied. All the materials were synthesized as very fine powders from metal salt and diamine solutions following an analogous simple procedure. Scanning electron microscopy (SEM) images and recorded powder X-ray diffraction patterns (PXRD) allowed for the assessment of the purity and crystallinity of the products. Based on the collected diffraction data, lattice parameters and symmetry were determined. For five of the synthesized compounds (n = 4, 6, 7, 8, and 12) that were of relatively high purity and sufficient crystallinity, crystal structure models were determined and refined. It was found that the structure symmetry depends on the parity of the number of carbon atoms in the diamine molecules. Structures of the investigated compounds belonging to the even series are centrosymmetric while the ones from the odd series are not (P 2 1 space group). Structures' symmetry of compounds based on even diamines decreases from P 2/ m to P 1 ¯ with increasing length of the organic molecules. Diamine molecules are aligned parallel to the diagonals of the (010) faces of the unit cell and there is an almost perfectly linear correlation between the value of a lattice parameter and the number of C atoms. There are, however, separate trends for even or odd series. Differential scanning calorimetry (DSC) and non-ambient PXRD measurements provided information about the thermal decomposition of the materials. The temperature of decomposition decreases with the growing length of diamine molecules and achieves the lowest value (176 °C, 449 K) for the compound with 1,12-diaminododecane (the longest diamine among the studied ones) while the sample with 1,4-diaminobutane is the most stable one (up to around 284 °C, 557 K). The studied compounds also show odd-even separate trends concerning the decomposition temperature. The compounds with even diamines start to decompose at relatively higher temperatures than the ones belonging to the odd series. [Display omitted] [ABSTRACT FROM AUTHOR]

• Threenew supramolecular materials with novel structures were prepared. • The threematerialswerecharacterized by X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis. • The photocatalytic degradation performance fortetracycline were studied. • The H2O2/compound 2system has a better catalytic effect on tetracycline. In this paper, triethylamine or 4-cyanopyridine were used to synthesize template cationic L1·Br 4 , L2·Br 3 with polybromomethyl benzene. They were then reacted with metal salts and polyacids respectively by normal temperature volatilization and solvothermal methods to synthesize new supramolecular compounds 1–3 :{(L1)[Ag 2 I 5 ]I·CH 3 CN}(1), {(L1)[BiBrI 5 ]I}(2) and {[Cu·(4, 4 '-bipy)·H 2 O][Mo 3 O 10 ]·H 2 O} n (3) (L1·Br 4 N , N', N'', N'''-(benzene-1, 2, 4, 5-tetrayltetrakis(methylene)) tetrakis(N, N-diethylethanaminium) bromide, L2·Br 3 =1, 1′, 1′'-((2, 4, 6-trimethylbenzene-1, 3, 5-triyl)tris(methylene)) tris(4-cyanopyridin-1-ium) bromide, 4, 4 '-bipy=4, 4 '-bipyridine). They were characterized by X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis. The compound 1 is a binuclear compound, compound 2 is a mononuclear compound and compound 3 is a 3D coordination polymer with multinuclear building blocks. In addition, their photocatalytic degradation performances on antibiotic TC were investigated. [ABSTRACT FROM AUTHOR]

More and more attention has been paid to food safety. Due to the overuse and misuse of antibiotics, the problem of antibiotic residues in animal food is one of the important challenges to ensure food safety. The development of a feasible strategy to detect antibiotic residues in animal food has become desirable. In this paper, we creatively synthesize a water-stable fluorescence sensing material, namely, Co(Ⅱ)-Coordination polymer [Co 2 (CA) (L) 0.5 (H 2 O) 3 ] n (L = 1,4-bis(imidazole-1-ylmethyl) benzene, CA= Citric acid). The single crystal X-ray diffraction shows that it crystallizes in tetragonal space group I -4. It is worth mentioning that there exists the rare Co 4 (μ 3 -O) 4 cubane cluster structure and Co 8 cluster units. Those adjacent Co 8 cluster units are connected into an infinite two-dimensional net structure by four flexible bridged L ligands. Finally, the Co(Ⅱ)-Coordination polymer (CP) further develops into the three-dimensional supramolecular structure via the hydrogen bonds of O–H⋯O and C–H⋯O. It could selectively detect the antibiotic-nitrofurantoin (NFT) residue by way of fluorescence quenching, Co-CP for the detection of NFT shows broad linearity from 0 to 200 μM, with a detection limit of 0.13 μM and strong anti-interference ability. It is used to detect the NFT residual of tap water and milk with a spiked recovery of 86.35–112.47 %. The new fluorescent sensing material Co-CP has been synthesized. there exists the rare Co 4 (μ 3 -O) 4 cubane cluster structure and Co 8 cluster units in the water-stable Co-CP. It could selectively detect the antibiotic-NFT residue by the way of fluorescence quenching with broad linear range from 0 to 200 μM and low LOD. It is used to detect the NFT residual of tap water and milk with the spiked recovery of 86.35–112.47 %. [Display omitted] • Water-stable fluorescence sensing material [Co2(CA)(L)0.5(H2O)3]n has been synthesized by hydrothermal method. • The single crystal X-ray diffraction shows that it crystallizes in tetragonal space group I -4. • There exist the rare Co 4 (μ 3 -O) 4 cubane cluster structure and Co 8 cluster units. • It could selectively detect nitrofurantoin residue by fluorescence quenching with broad linear range and low LOD. • It is used to detect the nitrofurantoin residual of tap water and milk with the spiked recovery of 86.35–112.47 %. [ABSTRACT FROM AUTHOR]

Microplastic (MP) residues in marine have become an increasingly serious environmental pollution issue, and in recent years the detection of MPs in marine started to attract worldwide research interests. Optical-fiber-based environmental sensors have been extensively employed for their several merits such as high sensitivity, pressure resistance, compactness and ease of constructing communication networks. However, fiber-optic refractive index sensors are not specifically developed for distinguishing MPs from other inorganic particles suspended in water. In this paper, an metal-organic framework (MOF) ZIF-8 functionalized S-tapered fiber (STF) sensor is proposed for specific detection of polystyrene nanoplastics (PSNPs) in aqueous environment. ZIF-8 coordination nanoporous polymers with different film thickness were immobilized over the surface of the fabricated STF structure based on self-growth technique and yielding a large surface area over the sensor surface. High sensitivity detection can be achieved by converting the concentration perturbation of PSNPs into evanescent waves over the ZIF-8 functionalized STF surface through the strong electrostatic adsorption effect and π-π stacking, while the fabricated sensor is insensitive to gravels with silica as the primary component in water. It is found that the proposed detector with 18 film layers achieves a sensitivity up to 114.1353nm/%(w/v) for the PSNPs concentration range of 0.01 %(w/v) to 0.08 %(w/v). [Display omitted] • Fiber-optic sensor for nanoplastics detection based on ZIF-8 has been proposed. • The effect of the number of ZIF-8 modified layers on the sensing performance is discussed in detail. • The detection performance and working principle of these ZIF-8-modified fiber optic sensors are summarized. • Compared with other sensors, STF sensor possesses wide measurement range for low concentration and high measurement accuracy. [ABSTRACT FROM AUTHOR]

Two fresh Co(II)-based coordination polymers (CPs) have been synthesized and hydrogels loaded with Co(II) metal–organic frameworks of bleomycin were produced on the basis of the drug's sluggish release. Their application values were assessed on osteosarcoma cells, and the associated mechanism was investigated. [Display omitted] • Two fresh Co(II)-based coordination polymers (CPs) have been synthesized. • HA/CMCS hydrogel was prepared by chemical synthesis. • We designed and synthesized two metallogel particle frameworks encapsulating bleomycin drugs. • We compared the effects of the two metallogel particle frameworks for the treatment of hemangiomas. In the current paper, through utilizing two symmetrical pentacarboxylate ligands, namely, 3,5-di(2′,5′-dicarboxylphenyl)benzoic (H 5 L 1) and 3,5-di(2′,4′ dicarboxylphenyl)benzoic acid (H 5 L 2), two fresh Co(II)-basd coordination polymers (CPs), [Co 5 (μ 3 -H 2 O) 2 (L1) 2 ]·3DMA·4H 2 O (1 , DMA is N, N -dimethylacetamide) along with [Co 3 (μ 3 -OH)L2(H 2 O) 3 ]·H 2 O (2) have been synthesized under the conditions of solvothermal. With hyaluronic acid (HA) and carboxymethyl chitosan (CMCS) as raw materials, HA/CMCS hydrogel was prepared by chemical synthesis and its internal microstructure was observed by scanning electron microscope. Using bleomycin as a drug model, we designed and synthesized two metallogel particle frameworks encapsulating bleomycin drugs and compared the effects of the two metallogel particle frameworks as drug carriers for delivering bleomycin drugs for the treatment of hemangiomas. [ABSTRACT FROM AUTHOR]

Bimetallic compounds nanocrystals exhibited great potential in catalysis due to the synergistic effects and encouraging performance. Herein, a series of NiCo-based nanosheets, including NiCo LDH/NiCo(OH) 2 , NiCo, and NiCo 2 O 4 , have been developed to modify MnS/Mn 0·2 Cd 0·8 S (MMCS) nanoparticles for photocatalytic H 2 production under visible light (λ > 420 nm). The two-dimensional (2D) NiCo 2 O 4 and NiCo were derived from the oxidation and reduction process of the as-prepared NiCo LDH/NiCo(OH) 2 nanosheets, respectively. MMCS nanoparticles were prepared using a one-pot solvothermal method and then integrated into three different NiCo-based nanosheets through a simple hybridization approach. Compared to pure MMCS, the resultant NiCo-based nanosheets/MMCS hybrids show dramatically improved visible-light photocatalytic activities. Moreover, among the three types of composites, NiCo 2 O 4 -MMCS (7%NiCo 2 O 4 -MMCS) displays the highest H 2 production rate of 3.31 mmol g−1 h−1 with the apparent quantum efficiency of 6.42% at 420 nm, approximately 22 and 5 times that of pure MMCS (0.15 mmol g−1 h−1) and Pt/MMCS (0.67 mmol g−1 h−1), respectively. The remarkably enhanced photocatalytic activities of the NiCo LDH/NiCo(OH) 2 -MMCS, NiCo-MMCS, and NiCo 2 O 4 -MMCS are mainly ascribed to the formed type-II, Schottky, and p-n heterojunctions, respectively, which efficiently boost photogenerated charge carrier separation and migration. In this paper, we intensively investigate the roles of three different NiCo-based nanosheets in the Mn x Cd 1-x S-based system. This work provides an effective strategy to design and construct the innovative 2D bimetallic compounds-based catalysts for high-efficiency photocatalytic H 2 production. The existence of type-II, Schottky, and p-n heterojunctions for NiCo LDH/NiCo(OH) 2 -MMCS, NiCo-MMCS, and NiCo 2 O 4 -MMCS boosted the transfer of photogenerated carriers. This work provides important insights into the various heterojunctions based on the NiCo-based nanosheets and suitable visible-light-responsive semiconductors toward high-efficiency photocatalytic water splitting. [Display omitted] • MnS/Mn 0·2 Cd 0·8 S (MMCS) were prepared via a one-pot solvothermal approach. • NiCo-based nanosheets modified MMCS exhibited enhanced photocatalytic activity. • NiCo 2 O 4 -MMCS composite exhibited the highest photocatalytic H 2 production rate. • The heterojunctions of three different MMCS-based composites were investigated. [ABSTRACT FROM AUTHOR]

Prussian blue (PB) is a coordination polymer based on the Fe2+...C N...Fe3+ sequence. It is an FDA-approved drug, intended for oral use at the acidic pH of the stomach and of most of the intestine track. However, based on FDA approval, a huge number of papers proposed the use of PB nanoparticles (PBnp) under "physiological conditions", meaning pH buffered at 7.4 and high saline concentration. While most of these papers report that PBnp are stable at this pH, a small number of papers describes instead PBnp degradation at the same or similar pH values, i.e. in the 7–8 range. Here we give a definitively clear picture: PBnp are intrinsically unstable at pH ≥ 7, degrading with the fast disappearance of their 700 nm absorption band, due to the formation of OH- complexes from the labile Fe3+ centers. However, we show also that the presence of a polymeric coating (PVP) can protect PBnp at pH 7.4 for over 24 h. Moreover, we demonstrate that when "physiological conditions" include serum, a protein corona is rapidly formed on PBnp, efficiently avoiding degradation. We also show that the viability of PBnp-treated EA.hy926, NCI-H1299, and A549 cells is not affected in a wide range of conditions that either prevent or promote PBnp degradation. [Display omitted] ● The pH range of stability of Prussian Blue nanoparticles (PBnp) is now definitely clear. ● At physiological pH (7.4) PBnp are intrinsically unstable and degrade in < 24 h. ● PBnp degradation is due to the formation of OH- complexes of the labile Fe3+ centres. ● In in-vivo-like conditions a protein corona is formed that protects PBnp from degradation. [ABSTRACT FROM AUTHOR]

Industrial waste acidic gases are huge hazards to the environment and human health, so a material that can detect and remove them is needed. In this paper, CM chitosan-Eu3+ fluorescence aerogel was prepared via a green method by combining the carboxymethyl chitosan biomass polymer with Eu3+ ions, the structure and properties of this aerogel were characterized by SEM, TG, and stress-strain curves. The coordination of Eu3+ ions and carboxymethyl chitosan was analyzed with XPS and the difference in luminescence intensity of aerogel prepared at different pH values was analyzed. The monitoring of the aerogels revealed different responses to different acidic gases, and the fluorescence intensity of the aerogel showed a linear decrease with the adsorbed hydrogen chloride gas (HCl), while acetic acid gas (HAc) enhanced fluorescence. The adsorption system of the CM chitosan-Eu3+ aerogel was simulated using pseudo-second-order kinetics, which showed that the maximum adsorption capacity of HCl is 9.16 mmol/g. The different response mechanisms of HCl and HAc gas were analyzed with FT-IR, fluorescence lifetime imaging and Judd-Ofelt theory. This fluorescence aerogel was found to have potential applications in ensuring industrial production safety. • Fluorescence aerogels were prepared by adjusting the pH of CMCh and Eu3+ ions solution. • The involvement of amino, hydroxyl, carboxyl and ether bond in CMCh in the coordination of Eu3+ ion was well demonstrated by XPS. • The fluorescence of CMCh-Eu3+ aerogel displayed a segmented linear quenching in HCl gas, while enhanced in HAc gas. • The fluorescence response of aerogels to HCl and HAc gas was proved with FTIR, fluorescence lifetime and Judd-Ofelt theory. [ABSTRACT FROM AUTHOR]

This paper proposes a novel approach to TSO–DSO coordination in day-ahead operation planning for the procurement of ancillary services (AS) such as congestion management and voltage control. The approach overcomes two major issues hindering practical applicability of existing TSO–DSO coordination mechanisms, namely the computational complexity due to the large number of times the TSO and DSO problems are resolved as well as the inability to map analytically the cost and amount of flexibility at DSO level into TSO problem. To this end, a two-fold novelty of our approach consists of the decomposition of the overall AS problem into two sequential stages, which seek the procurement of: (i) "active power related" AS (i.e., for congestion management) and then (ii) the "reactive power related" AS (i.e., for voltage support), respectively as well as a fast approximation of the cost of aggregated active and reactive power flexibilities of active distribution systems (ADSs). Unlike existing mechanisms, the proposed approach considers real-world challenging aspects such as the N-1 security at TSO level and operation uncertainties at both TSO and DSO levels. Accordingly, the approach relies on tailored versions of stochastic multi-period AC security-constrained optimal power flow (S-MP-SCOPF) at TSO level and stochastic multi-period AC optimal power flow (S-MP-OPF) at DSO level, which are formulated as non-linear programming (NLP) problems. The importance and performance of the proposed approach are illustrated on a power system connecting a 60-bus transmission system (under 33 N-1 contingencies) with five 34-bus ADSs. • This paper proposes a two-stage approach to TSO–DSO coordination in day-ahead operation. • The approach procures optimally ancillary services for managing congestion and voltages. • A new mapping cost vs amount of aggregated flexibility in distribution grid is proposed. • The paper considers real-world challenges such as operation uncertainties and the N-1 security. • The approach relies on tailored versions of stochastic multi-period AC optimal power flow. [ABSTRACT FROM AUTHOR]

Additive doping is one of the effective methods to overcome the shortcomings of MgH 2 on the aspect of relatively high operating temperatures and slow desorption kinetics. In this paper, hollow g-C 3 N 4 (TCN) tubes with a diameter of 2 μm are synthesized through the hydrothermal and high-temperature pyrolysis methods, and then nickel is chemically reduced onto TCN to form Ni/TCN composite at 278 K. Ni/TCN is then introduced into the MgH 2 /Mg system by means of hydriding combustion and ball milling. The MgH 2 –Ni/TCN composite starts to release hydrogen at 535 K, which is 116 K lower than the as-milled MgH 2 (651 K). The MgH 2 –Ni/TCN composite absorbs 5.24 wt% H 2 within 3500 s at 423 K, and takes up 3.56 wt% H 2 within 3500 s, even at a temperature as low as 373 K. The apparent activation energy (E a) of the MgH 2 decreases from 161.1 to 82.6 kJ/mol by the addition of Ni/TCN. Moreover, the MgH 2 –Ni/TCN sample shows excellent cycle stability, with a dehydrogenation capacity retention rate of 98.0% after 10 cycles. The carbon material enhances sorption kinetics by dispersing and stabilizating MgH 2. Otherwise, the phase transformation between Mg 2 NiH 4 and Mg 2 NiH 0.3 accelerates the re/dehydrogenation reaction of the composite. • Ni/tubular g-C 3 N 4 was synthesized and introduced into MgH 2. • Ni/TCN compound lowers onset desorption temperature of MgH 2 by 116 K. • Ni/TCN compound decreases desoption activation energy from 161.1 to 82.6 kJ/mol. [ABSTRACT FROM AUTHOR]

Influence of the second ligands on the structures. Two CPs can be used as multifunctional luminescent probes to detect the enrofloxacin and ciprofloxacin with high selectivity and sensitivity. [Display omitted] • Two novel Cd-based compound [CdL(BA) 2 (H 2 O) 2 ] n 1 (L = 1,4-bis(imidazole-1-ylmethyl)benzene; BA = benzoic acid) and Co-based compound [Co 3 L 3 (OX) 3 ] n 2 (H 2 OX = Oxalic acid) have been synthesized by hydrothermal method. • The influence of the second ligands on the structure of compound 1 and 2 have been studied. • Two CPs can be used as multifunctional luminescent probes to detect the enrofloxacin and ciprofloxacin with high selectivity and sensitivity. In this paper, we have successfully obtained two novel compounds, namely, the Cd-based compound [Cd 0.5 L 0.5 (BA)(H 2 O)] n 1 (L = 1,4-bis(imidazole-1-ylmethyl) benzene; BA = benzoic acid) and the Co-based compound [Co 1.5 L 1.5 (OX) 1.5 ] n 2 (H 2 OX = Oxalic acid) by using the hydrothermal methods. The Cd ion in 1 and the Co ion in 2 have the same coordination number. However, due to the different second ligands, namely benzoic acid in 1 and oxalic acid in 2 , 1 is the 1D chain structure and 2 is the 2D layer structure, thus the second ligand also plays an important role in the structure of compound. Two CPs can be used as multifunctional luminescent probes to detect the enrofloxacin and ciprofloxacin with high selectivity and sensitivity. [ABSTRACT FROM AUTHOR]

[Display omitted] • By using different O-donor ligands, we have designed and synthesized two Cu-CPs. • The Cu-CPs can be served as UIs which show excellent urease inhibitory activity. • Inhibitory activity, kinetic, molecular docking of the UIs have been studied. • The O atoms of–COO and μ 2 -OH play vital roles in urease inhibition activity. • The application of Cu-CPs as UIs in agriculture is rare. Urease inhibitors (UIs) can improve soil nutrients, reduce soil nitrogen loss, increase nitrate nitrogen content, and help soil maintain nutrients. Because the already available inhibitors were harmful and inefficient, it was critical to develop and manufacture a new family of UIs with high efficiency. In this paper, two copper-based coordination polymers (Cu-CPs) were prepared and served as UIs, which showed that the Cu-CPs had good inhibitory effects on urease and the inhibitory rates were 0.83 ± 0.01 μM and 4.22 ± 0.51 μM. The kinetics of the UIs were determined that the Cu-CPs were anti-competitive inhibition modes with corresponding dissociation constants K i of 1.52 μM and 5.32 μM. The results of molecular docking show that the two series of active compounds have obvious binding effect on the active site of urease. Furthermore, the oxygen atoms of –COO and μ 2 -OH groups play critical roles in urease inhibition action. [ABSTRACT FROM AUTHOR]

A one-dimensional coordination polymer (CPs) named Cu-phen-PEDA was synthesized by solvent thermal synthesis as an energy donor, riboflavin (energy acceptor) can be detected by ratio fluorescence and has good water stability. [Display omitted] • A 1D Cu-based CPs was synthesized by hydrothermal synthesis has excellent water stability. • The Cu-based CPs serves as an energy donor and can detect riboflavin through proportional fluorescence. • This fluorescent probe has a low LOD, as low as 23 nM. Riboflavin was first isolated from milk and widely used in food, biological and pharmaceutical fields. Accurate detection of riboflavin content is of great significance for the treatment of related diseases and the supervision of food/drug quality. In this paper, a 1D chain copper-based coordination polymer with excellent water stability was synthesized by hydrothermal method using rigid ligand 1,10-phenanthroline and flexible ligand 1,4-phenylenedioxydiacetic acid, named Cu-phen-PEDA. Based on the Förster resonance energy transfer (FRET) and dynamic quenching detection mechanism, the emission spectrum of Cu-phen-PEDA overlaps with the absorption spectrum of riboflavin. As an energy donor in this case, Cu-phen-PEDA significantly increases the fluorescence intensity of riboflavin (energy acceptor), while simultaneously decreasing its own fluorescence intensity, which is an effective proportional-building strategy. In the lower concentration range, riboflavin can be specifically recognized by ratiometric fluorescence with a good linear relationship, and the detection limit is as low as 23 nM. The potential aspects of its specificity, stability, reusability and practical application were explored. [ABSTRACT FROM AUTHOR]

The paper considers the effect of the modifier (nitric and sulfuric acids) on the physicochemical properties of aluminum oxide as a component (carrier) of cracking catalysts. The modifier was introduced during pre-treatment of the thermochemical activation product of gibbsite (TCA product). The article describes the influence of the amount of acids introduced during the TCA product pre-treatment stages (hydration and hydrothermal treatment (HTT)) on the acidic and textural properties of the resulting product. The activity of the obtained aluminum oxide samples during catalytic cracking of n-hexadecane, a model feedstock, was evaluated. All obtained samples were compared with aluminum oxide produced by the sulfate redeposition method. The cracking of hydrotreated vacuum gasoil on catalytic systems "aluminum oxide – zeolite Y″ was investigated. [Display omitted] - Aluminum oxide is an important component of FCC catalyst. - Hydration and hydrothermal treatment are required to prepare aluminum hydroxide. - Modification SO 4 2− of aluminum oxide increases the acidity and catalyst FCC activity. [ABSTRACT FROM AUTHOR]

The series of LCP 1 – 3 with different structures showed good responses to Fe3+, NB, CAP, and PTH, among which LCP 2 with 2D structure exhibited better LOD values than those reported in the literature. The practical application of LCP 1 – 3 for the detection of PTH in fruits was excellent. And the mechanism of fluorescence quenching was a combination of PET, CA and RET. [Display omitted] • Design and construct a series of LCP 1-3 with 1D, 2D, 1D structures. • LCP 2 has the most response to Fe3+, PTH, NB, and CAP and anti-interference properties. The LOD is better than some of the values reported in the literature. • LCP 1-3 are effective in detecting pyrimethamine in apples, apple skins, and grape skins. Luminescent coordination polymers (LCPs) have garnered significant attention from researchers as promising materials for detecting contaminants. In this paper, three new LCPs ([Zn(tib)(opda)] n ⋅H 2 O (1), [Zn 3 (tib) 2 (mpda) 3 ] n ⋅5H 2 O (2), [Zn (tib)(ppda)] n ⋅H 2 O (3)) with different structures (LCP 1 – 3 : 1D, 2D, 1D) using phenylenediacetic acid isomers and 1,3,5-tris (1-imidazolyl) benzene (tib) are synthesized. The specific surface areas (BET) of LCP 1 – 3 are 4 m2/g, 19 m2/g, and 13 m2/g respectively. LCP 1 – 3 exhibit excellent fluorescence properties and can serve as fluorescent probe for the detection of inorganic contaminants and organic contaminants. Due to the large BET of LCP 2 , the detection limits for trace analytes surpass those of LCP 1 and 3. The detection limits of LCP 2 for Fe3+, nitrobenzene (NB), chloramphenicol (CAP), and pyrimethanil (PTH) are 8.3 nM, 0.016 μM, 0.19 μM, and 0.032 μM, respectively, and the fluorescence quenching rates are 98.6 %, 98.8 %, 92.3 %, and 98.8 %, respectively. These values outperform most reported in the literature. The quantum yields of LCP 1 – 3 are 11.84 %, 25.22 %, 22.00 % respectively. Real sample testing of LCP 1 – 3 reveals favorable performance, where spiked recoveries of LCP 2 for the detection of pyrimethanil in grape skins ranged from 99.62 % to 119.3 % with a relative standard deviation (RSD) of 0.627 % to 4.56 % (n = 3). The fluorescence quenching mechanism was attributed to a combination of photoelectron transfer (PET), resonance energy transfer (RET), and competitive absorption (CA). This study advances the application of LCPs in luminescence sensing and contributes to the expansion of novel materials for detecting environmental pollutants. [ABSTRACT FROM AUTHOR]

• The pyridine polymers with cationic skeleton were obtained utilizing conjugation ring. • The cationic framework of pyridine polymers endows them with Au(III) selectivity. • The single point contact improved the pyridine polymer adsorption capacity for gold. • The cationic pyridine polymers perform well in practical solutions with significantly varying ionic concentrations. Recovering gold from rich waste printed circuit boards (WPCBs) resource are of great significance to gold development and utilization. In this paper, cationic pyridine polymers with different configurations were designed and synthesised for highly selective and efficient recovery of gold from a WPCB leaching solution. The structures and performances of the cationic pyridine polymers were analysed using a 4–aminopyridine polychloromethylstyrene (4–AP/PCMS). The results indicate that the 4–AP/PCMS performed well in an acidic environment, including in the 5 % aqua regia solution. Gold adsorption on the 4–AP/PCMS followed pseudo–second–order kinetics and Langmuir isotherm models, suggesting that chemisorption occurred via a single–layer mechanism with a maximum loading capacity of 437.68 mg/g. Further, Au(III) adsorption on the 4–AP/PCMS involved electrostatic interactions and reduction between pyridine and AuCl 4 −. After five adsorption–desorption cycles, the adsorption rate remained above 99 %, whereas in actual leaching solutions it reached 92.24 %. All five pyridine polymers demonstrated outstanding Au(III) selectivity over binary and multicomponent solutions containing Cu(II), Ni(II), Co(II), Zn(II), Fe(III), Cd(II), and Mg(II), benefitting from the cationic pyridine skeleton. Contact patterns between the cationic pyridine polymers and AuCl 4 − considerably affected the gold loading capacity, and a single–point contact was found to be favourable for gold adsorption. These results indicated that cationic pyridine polymers are promising for recovering gold from WPCB leaching solutions. [ABSTRACT FROM AUTHOR]

• Three new Zn(II)-CPs were synthesized and characterized. • 1, 2 , and 3 exhibited highly sensitive and selective sensing for LEV and BZH. • The sensing mechanisms was discussed. • 1, 2 , and 3 were employed in paper-based sensors for visual detection of LEV and BZH. Three new ternary Zn(Ⅱ)-based coordination polymers (CPs), [Zn(L)(PA)] n (1), [Zn 4 (L) 2 (IP) 3 (OH) 2 ] n (2), and [Zn(L)(TP)] n (3) (H 2 PA = phthalic acid, H 2 IP = isophthalic acid, H 2 TP = terephthalic acid, L = 2-(2-Pyridin-4-yl-vinyl)-1 H -benzimidazole, BZH = benzaldehyde, and LEV = levofloxacin), were hydrothermally synthesized and characterized. 1 exhibits a 1D trapezoidal chain, which is further expanded by π - π stacking interaction into a 2D supramolecular layer. While 2 displays an unusual 3, 5, 6-coordinated simplified underlying cgh7 network, 3 reveals a 2D hcb sheet and extended into a 3D supramolecular framework via classic hydrogen bond interactions. Three CPs and their paper-based sensors are dual-functional luminescent probes for the detecting of levofloxacin and benzaldehyde with high sensitivity and selectivity. [Display omitted] [ABSTRACT FROM AUTHOR]

In this paper, a facile strategy for the synthesis of composited CuO/Co 3 O 4 nanoribbons is presented based on the supramolecular co-assembly. Large-scale nanosized coordination polymers were obtained under the role of desolvation of the metal ions and ligands, which was used as precursors to construct CuO/Co 3 O 4 nanoribbons. According to the x-ray diffraction (XRD) and inductive coupled plasma emission (ICP) measurements, CuO can be regarded as dispersion phase while Co 3 O 4 can be identified as matrix. What's more, CuO species are homogeneously dispersed in Co 3 O 4 matrix. The catalytic performance of this obtained composited material was measured based on the reduction of organic dye in the presence of NaBH 4 as reduction agent, demonstrating that CuO species play the major role in catalytic reaction and the catalytic activity constant was concluded to be 549.02 s−1 g−1. As for Co 3 O 4 species, excellent magnetic property makes it possible for magnetic separation from reaction system. This mass productivity of the CuO/Co 3 O 4 materials with low cost and outstanding catalytic ability have great potential application prospect in water treatment. The CuO/Co 3 O 4 nanoribbon with excellent catalytic performance on reduction of organic dyes was obtained using coordination polymer as precursor. [Display omitted] • In this paper, we presented a supramolecular co-assembly strategy for the synthesis of organic hybrid CuMA/CoMA precursor, which was then used to obtained CuO/Co 3 O 4 nanocomposite. The high lights of our work lie in that: • CuMA/CoMA precursor with ribbon-like morphology was obtained based on co-assembly strategy. • CuO is highly dispersed into Co 3 O 4 matrix. • The obtained CuO/Co 3 O 4 nanocomposites exhibit excellent catalytic and magnetic performance. [ABSTRACT FROM AUTHOR]

Composition and microstructure are two determinative factors for carbon-based absorbers, therefore, balancing the dual coordination possess a formidable importance in the final performance. In this paper, magnetic particles (Fe, Co and Ni) encapsulated in porous N-doped carbon as lightweight and efficient microwave absorbers are reported. The coordination assembly strategy is firstly used to fabricate metal-organic polymer coordination composites, then, these metal ions are in situ reduced by a carbonization process, resulting in magnetic porous N-doped carbon (Fe@PNC, Co@PNC and Ni@PNC) composites with adjusted composition and porous microstructure. Benefiting from the porous microstructure with large surface area, enhanced polarization loss and the synergetic effects between magnetic and dielectric loss, the composites exhibit unexceptionable attenuation ability. Concretely, the minimum reflection loss for Fe@PNC, Co@PNC and Ni@PNC reaches as high as −61.6 dB, −65 dB and −65.1 dB with the matched thickness of 2 mm, 2.5 mm and 3.5 mm, and the effective bandwidths are 5.3 GHz (at 3.4 mm), 6.7 GHz (at 2 mm) and 8.6 GHz (at 2.5 mm), respectively. This strategy provides not only a new guidance in the fabrication of carbon absorbers, but also a comprehension in the structure design and composition control through the chelating ability. Image 1 [ABSTRACT FROM AUTHOR]

Graphene oxide has been widely studied as a new type of adsorbent due to its strong affinity for heavy metal ions. However, limited by the number of oxygen-containing functional groups on its surface, there are still some defects in the field of heavy metal ion adsorption. In this paper, graphene oxide (GO) was prepared by modified Hummers method, and carboxylated graphene oxide (GO-COOH) was further synthesized by the derivatization reaction of bromoacetic acid with hydroxyl group under strong alkali conditions. The physical and chemical properties of the material were characterized by XRD, SEM, TEM, XPS and FT-IR. Taking copper and lead ion solutions as pollution models, the adsorption behaviors of the two heavy metal ions solutions on GO were investigated through batch adsorption experiments, adsorption kinetic model, adsorption isotherm model and Van't Hoff equation. The experimental results showed that the maximum adsorption capacity of GO for Cu(II) after carboxyl group treatment increased from 55.47 mg/g to 62.02 mg/g, and the maximum adsorption capacity of GO-COOH for Pb(II) increased from 85.17 mg/g to 96.21 mg/g. In this paper, the reasons for the difference in the adsorption capacity of GO for Cu(II) and Pb(II) and the significant enhancement of the adsorption performance of GO-COOH were discussed, and the possible adsorption mechanism was proposed. The research in this paper provides a new way to realize the efficient utilization of graphene oxide materials in the purification process of water environment and the development of modern materials science. [Display omitted] • The kinetics of GO adsorption on Cu(II) and Pb(II) were mainly controlled by chemical interactions. • The adsorption of GO on both metal ions was monolayer adsorption. • The adsorption performance of GO-COOH for both metal ions was superior to that of GO. • The adsorption of Pb(II) by GO-COOH was superior to that of Cu(II). [ABSTRACT FROM AUTHOR]

Four fluorescent coordination polymers (CPs) [Zn 2 (CH 3 -bpeb) (oba) 2 ] (CP 1), [Zn(2,5-dimethyl-bpeb) 0.5 (oba)] (CP 2), [Zn 4 (F-bpeb) 2 (oba) 4 ] (H 2 O) (CP 3) and [Zn 2 (NH 2 -bpeb) (oba) 2 ] (CP 4) (H 2 oba = 4,4′-oxydibenzoic acid; bpeb = 1,4-bis[(2-(pyridine-4-yl)vinyl)benzene]) were synthesized under solvothermal conditions. The "V" shaped H 2 oba ligand was used for constructing of a ring motif and the linear N-donor ligands (CH 3 -bpeb, 2,5-dimethyl-bpeb, F-bpeb, NH 2 -bpeb) served as interpenetrating columns. CP 1 -CP 4 fluoresced strongly in the solid state and stable suspensions of micron-level particles could be obtained by ultrasound. The fluorescences of these aqueous suspensions of CP 1 -CP 4 were quenched by folic acid (FA) in a concentration-dependent manner. CP test papers could effectively detect FA at micromolar concentrations. The micron-sized CPs suspension was obtained by liquid ultrasonic method and the characteristic fluorescence emission can be quenched by FA in a concentration-dependent manner. [Display omitted] 1. Four fluorescent CPs based on different N-donor ligands were synthesized under solvothermal conditions. 2. The micron-level CPs suspensions were obtained by the liquid ultrasonic method, which showed excellent performance in the detection of FA. 3. CPs can be used as fluorescent test paper, which can be effectively used to visual detection of FA by the naked eye. [ABSTRACT FROM AUTHOR]

Recirculation of hydrothermal carbonization (HTC) process water (PW) has been revealed as an effective strategy to promote the recovery of lost dissolved organics in the spent solvent. However, the role of operating parameters such as temperature, time and solid load during recirculation needs to be clarified and better investigated in order to achieve a successful PW valorization. In this paper, the effects of different reaction conditions during HTC with PW recirculation were studied by using orange peel waste as feedstock. The results showed that strong synergistic interactions occurred between the biomass and the recycled solvent, leading to a hydrochar mass yield increase between 0.5 and 11 wt% on a dry basis (d.b.), according to the reaction conditions. PW recirculation, especially at low conversion severity and solid load, increased hydrochar carbon content while drastically reduced the oxygen fraction. The reason was probably related to promoted dehydration and decarboxylation. As result, carbon and energy yields were respectively increased by 26.1 % and 27.0 %, on average. The energy balance outcomes showed that the energy recovery rose up to 8 times by recycling PW compared to phases with deionized water as HTC solvent. [Display omitted] • Hydrochar recovery enhancement is obtained by solvent recirculation. • Intense synergistic effects in hydrochar formation occur at low temperatures. • Dehydration and decarboxylation are promoted by solvent recycling. • Hydrochar carbon retention is increased by 6.2 % after recirculation at 180 °C. • Process water recirculation improves the conversion energy efficiency. [ABSTRACT FROM AUTHOR]

This paper provides a new avenue for the development of cellular structures. By mimicking the chemical structural formula of the TpPB-Fe coordination polymer, a new self-similar hierarchical honeycomb was proposed. With respect to the existing self-similar hierarchical honeycomb in the literature which was constructed by replacing every three-edge vertex of the regular hexagonal honeycomb with a smaller hexagon, the new one is created by setting the fractal position at the midpoint of the cell walls of the regular hexagonal honeycomb. What I am really curious about is the difference in mechanical properties between the two self-similar hierarchical honeycombs. Finite element (FE) model was first built and validated by comparing against the existing theoretical data. Subsequently, the in-plane crushing behaviors of the honeycombs under different impact velocities were fully investigated by FE simulations. The deformation modes, plateau stress as well as the energy absorption capability of the honeycombs were studied. Different macroscopic and microscopic deformation patterns between the two hierarchical honeycombs were observed. The plateau stress of the new hierarchical honeycomb is higher than that of both the existing counterpart and the basic regular hexagonal one. Under low- and medium-velocity impact loading, the new honeycomb with low fractal ratio (α) has superior energy absorption capability with respect to the existing counterpart and the basic regular hexagonal one. However, the new honeycomb will lose its advantage in energy absorption when the fractal ratio or the impact velocity is large. • A new self-similar hierarchical honeycomb was proposed. • In-plane crushing behaviors of both the new and the existing self-similar hierarchical honeycombs were studied. • Correlations among the deformation, stress and energy absorption of the hierarchical honeycombs were discussed. [ABSTRACT FROM AUTHOR]

• A three-dimensional crystal synthesized by carboxylic acid ligand and nitrogen-containing ligand. • The selective detection for Fe3+, Cr6+ and nitroimidazole antibiotics species in aqueous solution were investigated. • The quenching mechanism of the selective detection including theoretical calculation was presented. A novel complex of [Zn(L)(HEA)] n (1) has been successfully synthesized by hydrothermal method based on the double ligands of H 2 HEA (H 2 HEA = 1,2-Phenylenediacetic acid) and L (L = 1,1′-((2,4,6-trimethyl-1,3-phenylene)bis(methylene))bis(1H-1,2,4-triazole)). The single crystal structure of the complex was analyzed by X-ray single crystal diffraction, indicating that complex 1 was stacked into a 3D crystal structure through intermolecular π···π and C-H···π weak interaction. The complex was characterized by elemental analysis, infrared spectroscopy, PXRD and TGA. Additionally, fluorescence experiments showed that complex 1 could be used as a fluorescent probe for detecting Fe(III), Cr(VI), and Metronidazole (MDZ), Ornidazole (ODZ), Dimetridazole (DTZ) in aqueous solutions. Detection limits were obtained for ions (3.2×10−7 M for Cr 2 O 7 2−, 5.4×10−7 M for CrO 4 2− and 3.6 × 10−7 M for Fe3+) and nitroimidazole antibiotics (1.3×10−7 M for MDZ, 9.7×10−8 M for ODZ and 4.4×10−8 M for DTZ). The possible fluorescence quenching mechanism has been studied in the paper. One novel complex, namely, [Zn(L)(HEA)] n (1) (L = 1,1′-((2,4,6-trimethyl-1,3-phenylene)bis(methylene))bis(1H-1,2,4-triazole), H 2 HEA = 1,2-phenylenediacetic acid) was synthesized. The oxygen-containing chain in complex 1 extends in a zigzag shape along the a -axis, while the nitrogen-containing chain extends in a W-shape along the b -axis, a 2D planar structure was obtained in the ab plane. Through the formation of π···π (Cg (2)···Cg (2)) and C-H ··π (C5-H5···Cg2) interactions between the 2D layers, the 3D supermolecule structure of 1 was formed along the c -axis. [Display omitted] [ABSTRACT FROM AUTHOR]