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Photoactivatable carbon monoxide‐releasing molecules (CORMs), typically based on transition‐metal carbonyl complexes, have reliance on activation by UV or visible light that restricts their biomedical applications. To address this limitation, a near‐infrared (NIR)‐responsive nanoplatform is presented based on upconversion nanoparticles (UCNPs) loading with manganese carbonyl complex Mn2(CO)10 that concurrently releases CO and manganese ion (Mn2+). With the UCNPs, the more tissue‐penetrable NIR is used to locally generate UV light for photodecomposition of Mn2(CO)10 into CO and manganese oxide (MnOX), after which MnOX is reduced to Mn2+ by the overexpressed glutathione in cancer cells. Moreover, the released Mn2+ can serve as a magnetic resonance imaging contrast agent to monitor the NIR‐controlled corelease of CO and Mn2+ in real time. Therefore, this nanoplatform can provide a potential strategy for NIR‐enabled spatiotemporally release of CO and Mn2+, enhancing the controlled delivery and biomedical application of CORMs. [ABSTRACT FROM AUTHOR]

Phytohormones, epigenetic regulation and environmental factors regulate fruit ripening but their interplay during strawberry fruit ripening remains to be determined. In this study, bagged strawberry fruit exhibited delayed ripening compared with fruit grown in normal light, correlating with reduced abscisic acid (ABA) accumulation. Transcription of the key ABA catabolism gene, ABA 8′‐hydroxylase FaCYP707A4, was induced in bagged fruit. With light exclusion whole genome DNA methylation levels were up‐regulated, corresponding to a delayed ripening process, while DNA methylation levels in the promoter of FaCYP707A4 were suppressed, correlating with increases in transcript and decreased ABA content. Experiments indicated FaCRY1, a blue light receptor repressed in bagged fruit and FaAGO4, a key protein involved in RNA‐directed DNA methylation, could bind to the promoter of FaCYP707A4. The interaction between FaCRY1 and FaAGO4, and an increased enrichment of FaAGO4 directed to the FaCYP707A4 promoter in fruit grown under light suggests FaCRY1 may influence FaAGO4 to modulate the DNA methylation status of the FaCYP707A4 promoter. Furthermore, transient overexpression of FaCRY1, or an increase in FaCRY1 transcription by blue light treatment, increases the methylation level of the FaCYP707A4 promoter, while transient RNA interference of FaCRY1 displayed opposite phenotypes. These findings reveal a mechanism by which DNA methylation influences ABA catabolism, and participates in light‐mediated strawberry ripening. [ABSTRACT FROM AUTHOR]

An efficient approach to increase the energy density of supercapacitors is to prepare electrode materials with larger specific capacitance and increase the potential difference between the positive and negative electrodes in the device. Herein, an organic molecular electrode (OME) is prepared by anchoring 1,10‐phenanthroline‐5,6‐dione (PD), which possesses two pyridine rings and an electron‐deficient conjugated system, onto reduced graphene oxide (rGO). Because of the electron‐deficient conjugated structure of PD molecule, PD/rGOs exhibit a more positive redox peak potential along with the advantages of high capacitance‐controlled behaviour and fast reaction kinetics. Additionally, the small energy gap between the lowest unoccupied molecular orbital (LUMO) and highest occupied molecular orbital (HOMO) leads to increased conductivity in PD/rGO. To assemble the asymmetric supercapacitor (ASC), a two‐dimensional metal carbide, as known as MXene, with a chemical composition of Ti3C2Tx is selected as the negative electrode due to its exceptional performance, and PD/rGO‐0.5 is employed as the positive electrode. Consequently, the working voltage is expanded up to 1.8 V. Through further electrochemical measurements, the assembled ASC (PD/rGO‐0.5//Ti3C2Tx) achieves a remarkable energy density of 36.8 Wh kg−1. Remarkably, connecting two ASCs in series can power 73 LEDs, showcasing its promising potential for energy storage applications. [ABSTRACT FROM AUTHOR]

The skeleton is traditionally known for its structural support, organ protection, movement, and maintenance of mineral homeostasis. Over the last 10 years, bone has emerged as an endocrine organ with diverse physiological functions. The two key molecules in this context are fibroblast growth factor 23 (FGF23), secreted by osteocytes, and osteocalcin, a hormone produced by osteoblasts. FGF23 affects mineral homeostasis through its actions on the kidneys, and osteocalcin has beneficial effects in improving glucose homeostasis, muscle function, brain development, cognition, and male fertility. In addition, another osteoblast‐derived hormone, lipocalin 2 (LCN2) has emerged into the researchers' field of vision. In this review, we mainly focus on LCN2's role in appetite regulation and glucose metabolism and also briefly introduce its effects in other pathophysiological conditions, such as nonalcoholic fatty liver disease, sarcopenic obesity, and cancer‐induced cachexia. [ABSTRACT FROM AUTHOR]

CREB‐binding protein (CBP) (CREBBP) and p300 (EP300) are multifunctional histone acetyltransferases (HATs) with extensive homology. Germline mutations of CBP or p300 cause skeletal abnormalities in humans and mice. However, the precise roles of CBP/p300 in bone homeostasis remain elusive. Here, we report that conditional knockout of CBP or p300 in osteoblasts results in reduced bone mass and strength due to suppressed bone formation. The HAT activity is further confirmed to be responsible for CBP/p300‐mediated osteogenesis using A‐485, a selective inhibitor of CBP/p300 HAT. Mechanistically, CBP/p300 HAT governs osteogenic gene expression in part through transcriptional activation of β‐catenin and inhibition of Stat1. Furthermore, acetylation of histone H3K27 and the transcription factor Foxo1 are demonstrated to be involved in CBP/p300 HAT‐regulated β‐catenin and Stat1 transcription, respectively. Taken together, these data identify acetyltransferases CBP/p300 as critical regulators that promote osteoblast differentiation and reveal an epigenetic mechanism responsible for maintaining bone homeostasis. © 2023 American Society for Bone and Mineral Research (ASBMR). [ABSTRACT FROM AUTHOR]

Photo‐assisted reverse water gas shift (RWGS) reaction is regarded green and promising in controlling the reaction gas ratio in Fischer Tropsch synthesis. But it is inclined to produce more byproducts in high H2 concentration condition. Herein, LaInO3 loaded with Ni‐nanoparticles (Ni NPs) was designed to obtain an efficient photothermal RWGS reaction rate, where LaInO3 was enriched with oxygen vacancies to roundly adsorbing CO2 and the strong interaction with Ni NPs endowed the catalysts with powerful H2 activity. The optimized catalyst performed a large CO yield rate (1314 mmol gNi−1 h−1) and ≈100 % selectivity. In situ characterizations demonstrated a COOH* pathway of the reaction and photoinduced charge transfer process for reducing the RWGS reaction active energy. Our work provides valuable insights on the construction of catalysts concerning products selectivity and photoelectronic activating mechanism on CO2 hydrogenation. [ABSTRACT FROM AUTHOR]

Antimicrobial peptides (AMPs) with dual intrinsic antibacterial and antioxidative functions have emerged as promising choice to cure infected wound. However, the most widely applied approach to endow AMPs with antioxidative function is to combine with antioxidative moieties, which may affect the spatial structure and physiological stability of AMPs. Herein, a new type of AMPs with inherent desired stability, antibacterial activity, and reactive oxygen species (ROS) scavenging is developed to effectively heal the infected wound. This formulation is in situ formed at wound site by tyrosinase‐triggered oxidation and self‐assembly of lyophilized antimicrobial peptide Trp‐Arg‐Trp‐Arg‐Trp‐Tyr, providing enhanced stability and a fourfold and sevenfold increasement in antibacterial efficiency against E. coli and S. aureus compared to peptide monomers. The antimicrobial peptide is first oxidized and then assembled into nanoparticles. The melanin‐like structure has been demonstrated with efficient antioxidant properties, and the experimental data show that peptide nanoparticles to scavenge superoxide radicals, hydroxyl radicals, and H2O2. In vivo experiments confirmed that peptide nanoparticles effectively heal infected wounds and obviously reduce ROS. Overall, the research provides a new approach to formulating antimicrobial peptides to treat wound with high healing efficiency. [ABSTRACT FROM AUTHOR]

This research was focused on the synthesis of well‐defined bottlebrush polymers (BBPs) comprising of polynorbornene (PNB) backbones and side‐chains of the polylactide (PLA)‐b‐polystyrene (PS). The PNB backbones were synthesized via ring‐opening metathesis polymerization of norbornene, and then L‐lactide (LA) was first grafted to the backbones to form PLA side‐chains by ring‐opening polymerization. Afterwards, styrene was further grafted to the PLA cantilever with triothiocarbonate modification via reversible addition‐fragmentation chain transfer polymerization to form PLA‐b‐PS side‐chains. Controllable polymerization was achieved by introducing each block in stages. A novel structure with PLA and PS block arranged in tandem was constructed, and their morphologies of self‐assembly in bulk were investigated by transmission electron microscopy imaging. The results demonstrated that the compositions and molecular weight of the side‐chains in the BBPs affected the self‐assembling morphologies of the BBPs significantly, and revealed that the polymers were with core‐shell structures. [ABSTRACT FROM AUTHOR]

Dry reforming of methane (DRM) has provided an effective avenue to convert two greenhouse gases, CH4 and CO2, into syngas. Here, we design a DRM photocatalyst Rh/CexWO3 that invokes both photothermal and photoelectric processes, which overcomes the thermodynamic limitation of DRM under conventional conditions. In contrast to plasmonic or UV‐response photocatalysts, our photocatalyst produces a superior light‐to‐chemical energy efficiency (LTCEE) of 4.65 % with a moderate light intensity. We propose that a light‐induced metal‐to‐metal charge transfer plays a crucial role in the DRM reaction, which induces a redox looping between Ce to W species to lower the activation energy. Quantum mechanical studies reveal that a high oxygen mobility of CexWO3, accompanied with the formation of oxo‐bridge species, results in a substantial elimination of deposited C species during the reaction. Our catalyst design strategy could offer a promising energy‐efficient industrial process for DRM. [ABSTRACT FROM AUTHOR]

Wheat bran is rich in functional ingredients, but the high level of lipase limits its applications. Tempering–preservation treatment (at 70–90 °C with moisture of 20%–40% for 1–4 h) was exploited for stabilising wheat bran and its effect on polyphenols was investigated. The results showed that more lipase was inactivated at higher tempering moisture, temperature and longer time. The optimum condition for inactivation of wheat bran lipase was 30% moisture and 90 °C for 4 h. The inactivation rate reached 93.8% with a residual enzyme activity of 0.264 U g−1. Under the optimum condition, the sum of free phenolic acids rose from 25.4 to 55.8 µg g−1. As for bound phenolic acids, there was a slight increase of hydroxybenzoic acid derivatives but a slight decrease of hydroxycinnamic acid derivatives. The total contents of phenolic acids before and after stabilisation were not significantly different. This study showed the possibility of using tempering–preservation as an efficient method for inactivation of wheat bran lipase while maintaining its phenolic compounds, which could be used in the production of whole wheat flour. [ABSTRACT FROM AUTHOR]

Cold exposure is an unavoidable and severe challenge for people and animals residing in cold regions of the world, and may lead to hypothermia, drastic changes in systemic metabolism, and inhibition of protein synthesis. O‐linked‐N‐acetylglucoseaminylation (O‐GlcNAcylation) directly regulates the activity and function of target proteins involved in multiple biological processes by acting as a stress receptor and nutrient sensor. Therefore, our study aimed to examine whether O‐GlcNAcylation affected myogenic IL‐6 expression, regulation of energy metabolism, and promotion of survival in mouse skeletal muscle under acute cold exposure conditions. Total protein was extracted from C2C12 cells that had been cultured at 32°C for 3, 6, 9, and 12 h. Western blot analysis showed that mild hypothermia enhanced O‐GlcNAc transferase (OGT) and O‐GlcNAcase (OGA) expression. Furthermore, global OGT‐dependent glycosylation and interleukin‐6 (IL‐6) levels peaked 3 h after induction of mild hypothermia. Enhanced activation of the NF‐κB pathway was also observed in response to mild hypothermia. Alloxan and Thiamet G were used to reduce and increase global OGT glycosylation levels in C2C12 cells, respectively. Increased O‐GlcNAcylation was associated with significant upregulation of IL‐6 expression, as well as enhanced activity and nuclear translocation of p65, while decreased O‐GlcNAcylation had the opposite effect. In addition, increased O‐GlcNAcylation was associated with significantly increased glucose metabolism, and OGT‐mediated O‐GlcNAcylation of p65. We generated skeletal muscle‐specific OGT knockout mice and exposed them to cold at 4°C for 3 h per day for 1 week. OGT deficiency attenuated the O‐GlcNAcylation, activity, and nuclear translocation of p65, resulting in downregulation of IL‐6 in mouse skeletal muscle of mice exposed to cold conditions. Taken together, our data suggested that O‐GlcNAcylation of p65 enhanced p65 activity and nuclear translocation leading to the upregulation of IL‐6, which maintained energy homeostasis and promotes cell survival in mouse skeletal muscle during cold exposure. [ABSTRACT FROM AUTHOR]

The understanding of interlayer couplings should be paid much more attention owing to their importance in 2D materials with different layers. Here, through changing the number of layers, the tunability of interlayer coupling by external magnetic field in 2D material based field effect transistors is studied. External magnetic field can increase triplet electron‐hole (e‐h) pairs to promote interlayer coupling, where larger source‐drain current is induced. Moreover, increasing the gate voltage or source‐drain voltage, dipole–dipole interaction among the layers will be enhanced to weaken the tunability of source‐drain current by magnetic field. This result reveals the magnetic field dependence of interlayer couplings in 2D materials and provides a guidance to develop new functional 2D material devices. [ABSTRACT FROM AUTHOR]

Photo‐electrochemical cathodic protection (CP) technology is considered to be a green metallic corrosion protection technology that uses solar energy to protect from corrosion and does not consume any anode materials. In this work, a CdIn2S4/WO3 nanocomposite photoelectrode was prepared, and its photo‐electrochemical CP performance and mechanism were studied and analyzed. WO3 has a well band matching with CdIn2S4, leading to a significantly enhanced photo‐electrochemical CP performance of the nanocomposite. Meanwhile, as confirmed in this work, the CdIn2S4/WO3 nanocomposite can store photoinduced electrons under light illumination through intercalation reactions and changing the valence state of tungsten. Moreover, it can discharge in the dark state to provide continuous CP for the coupled metals. This research will promote the practical application process of the photo‐electrochemical CP technology. [ABSTRACT FROM AUTHOR]

A new redox‐active organic molecule, naphthalene diimide derivative (NDI), is synthesized through the condensation reaction for electrochemical energy storage, in which 1,4,5,8‐naphthalenetetracarboxylic dianhydride and 4‐aminophenol are used as skeleton and substituent, respectively. The NDI is acted as a guest molecule to non‐covalently modify reduced graphene oxide (rGO) and to form an organic molecular electrode (OMEs). The resultant electrode exhibits outstanding performance under the three‐electrode configuration, including specific capacitance (354 F g−1 at 5 mV s−1) and cycling performance (87.2% after 8000 cycles). Furthermore, the electrochemical behaviors of the OMEs are mainly controlled by surface reactions and pseudocapacitance contribution is up to 93% of the total capacity at 100 mV s−1. In addition, a positive electrode (graphene hydrogel‐2,6‐dihydroxynaphthalene (GH‐DN)) is formed by hydrothermal method. At last, an asymmetric device (GH‐DN//rGO‐NDI, ASC) is assembled and a specific capacitance of 111.3 F g−1 is reached. The ASC can deliver a high energy density of 26.3 Wh kg−1 at power density of 0.6 kW kg−1. Moreover, two ASC devices in series may light 81 light‐emitting diodes. It is believed that organic molecule electrodes are candidates for new green energy storage materials. [ABSTRACT FROM AUTHOR]

Efficient hydrogen release from ammonia borane (AB) with a striking hydrogen content (19.6 wt%) via thermolysis provides a promising pathway for on‐board applications utilizing hydrogen energy. However, the sluggish kinetics at low temperatures and high energy consumption of thermal dehydrogenation are major obstacles for hydrogen release from AB. Herein, a novel solar‐driven strategy for hydrogen production from AB at low temperature is proposed, in which Ti2O3 is utilized as a full‐spectrum light absorber for photothermal‐activating solid‐state AB reactants to produce hydrogen. Through a reduction transformation method, nanoscale Ti2O3 particles with high chemical stability and narrow band gap are prepared, realizing a rapid production of 2.0 equivalents of hydrogen from AB at ambient temperature, with an excellent recyclable and full‐spectrum‐responsive photothermal dehydrogenation. Importantly, a record high photothermal activation efficiency of 35% is achieved with nanoscale Ti2O3 particles due to an enhanced local photothermal effect contributed by improved light absorption and decreased thermal conduction. Moreover, assisted with CuCl2 promoter, a release of 2.0 equivalents of hydrogen under 1.0 solar irradiation at 70 °C is successfully achieved, revealing its potential applications in practical vehicles based on proton exchange membrane fuel cells. [ABSTRACT FROM AUTHOR]

The lead‐free halide perovskite A3Sb2Br9 is utilized as a photocatalyst for the first time for C(sp3)−H bond activation. A3Sb2Br9 nanoparticles (A3Sb2Br9 NPs) with different ratios of Cs and CH3NH3 (MA) show different photocatalytic activities for toluene oxidation and the photocatalytic performance is enhanced when increasing the amount of Cs. The octahedron distortion caused by A‐site cations can change the electronic properties of X‐site ions and further affect the electron transfer from toluene molecules to Br sites. After the regulation of A‐site cations, the photocatalytic activity is higher with A3Sb2Br9 NPs than that with classic photocatalysts (TiO2, WO3, and CdS). The main active species involved in photocatalytic oxidation of toluene are photogenerated holes (h+) and superoxide anions (.O2−). The octahedron distortion by A‐site cations affecting photocatalytic activity remains unique and is also a step forward for understanding more about halide‐perovskite‐based photocatalysis. The relationship between octahedron distortion and photocatalysis can also guide the design of new photocatalytic systems involving other halide perovskites. [ABSTRACT FROM AUTHOR]

Hierarchically porous, nitrogen-doped, and interconnected carbon nanosheets (HPN-CS) have been prepared from agaric through a one-step method, that is, simultaneous carbonization, activation, and nitrogen-doping. Potassium hydroxide infiltrated into the cell walls of agaric acts as an in-built activating agent to induce a unique architecture of the resultant material. HPN-CS have average pore diameter of 2.6 nm, specific surface area of 1565.6 m2 g-1, and high volume fraction of macro/mesopores (71.7%). It is noted that a lot of micropores with the simple pore structure are homogeneously distributed on the interconnected carbon nanosheets. The symmetric supercapacitor based HPN-CS achieve a high operation voltage of 2.0 V and energy density of 27.2 Wh kg-1 (at a power density of 1 kW kg-1) in aqueous electrolyte of 2 m Li2SO4. Even at the power density of 50 kW kg-1 (50 times increase, a full charge-discharge within 3.2 s), energy density still holds at 20.8 Wh kg-1, indicating an excellent energy storage/release performance. In addition, the single device is able to easily light 60 light-emitting diodes (working voltage 2.0-2.2 V) in parallel after charging for only 10 s, showing an outstanding potential in the practical applications. [ABSTRACT FROM AUTHOR]

Chemical oxidation is used to cut and unzip multi-walled carbon nanotubes in the transverse direction and the axial direction to form graphene oxide nanoribbon (GONR). Ruthenium oxide/reduced graphene oxide nanoribbon composite (RuO2/rGONR) with a 72.5 wt% RuO2 loading is synthesized through an aqueous-phase reaction, in which GONR is served as starting material, followed by mild thermal treatment in ambient air. The resulting RuO2/rGONR composite achieves specific capacitance up to 677 F·g−1 at the current density of 1 A·g−1 in three-electrode system using 1 mol·L−1 H2SO4 as electrolyte. The resultant electrode exhibits an excellent rate capability (91.8% retention rate at 20 A·g−1). Especially, the symmetric supercapacitor assembled on the basis of RuO2/rGONR electrode delivers high energy density (16.2 Wh·kg−1) even at the power density of 9885 W·kg−1, which is very essential for supercapacitors. [ABSTRACT FROM AUTHOR]

The reduced graphene oxide (RGO)/bisphenol A (BPA) composites were prepared by an adsorption-reduction method. The composites are characterized by X-ray diffraction (XRD), UV-vis, thermogravimetric (TG) analysis, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM). The results confirm that BPA is adsorbed on the basal plane of RGO by π-π stacking interaction. Furthermore, the electrochemical behaviors were evaluated by cyclic voltammetry, galvanostatic charge/discharge techniques and electrochemical impedance spectroscopy (EIS). The results show that the RGO/BPA nanocomposites exhibit ultrahigh specific capacitance of 466 F·g−1 at a current density of 1 A·g−1, excellent rate capability (more than 81% retention at 10 A·g−1 relative to 1 A·g−1) and superior cycling stability (90% capacitance decay after 4000 cycles). Consequently, the RGO/BPA nanocomposites can be regarded as promising electrode materials for supercapacitor applications. [ABSTRACT FROM AUTHOR]

In the present work Mn3O4/reduced graphene oxide hydrogel (Mn3O4-rGOH) with three dimensional (3D) networks was fabricated by a hydrothermal self-assembly route. The morphology, composition, and microstructure of the as-obtained samples were characterized using powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetry analysis (TG), atomic absorption spectrometry (AAS), field emission scanning electron microscopy (FESEM) and transmission electron microscope (TEM). Moreover, the electrochemical behaviors were evaluated by cyclic voltammogram (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS). The test results indicated that the hydrogel with 6.9% Mn3O4 achieved specific capacitance of 148 F·g−1 at a specific current of 1 A·g−1, and showed excellent cycling stability with no decay after 1200 cycles. In addition, its specific capacitance could retain 70% even at 20 A·g−1 in comparison with that at 1 A·g−1 and the operating window was up to 1.8 V in a neutral electrolyte. [ABSTRACT FROM AUTHOR]

In this paper, a simple route for palladium (Pd) nanoparticles attached to the surface of hollow magnetic Fe3O4/P (GMA‐DVB)‐polyethyleneimine (PEI) microspheres was established. Due to the large amount of imidogen groups and tertiary amine groups presenting in the PEI, Pd2+ ions could be anchored to the support by complexation with a polyfunctional organic ligand. Thereafter, a magnetic Pd catalyst having a high loading amount and good dispersibility was obtained by reducing Pd2+ ions. Afterwards, the prepared catalyst was characterized by TEM, SEM, FTIR, XRD, TGA, VSM, and UV–vis in detail. Ultimately, their catalytic activity was evaluated using the reduction of 4‐nitrophenol (4‐NP). Research showed that the Fe3O4/P (GMA‐DVB)‐PEI/Pd catalyst possessed high catalytic performances for the reduction of 4‐NP with a conversion rate of 98.43% within 540 s. Furthermore, the catalyst could be easily recovered and reused at least for nine successive cycles. [ABSTRACT FROM AUTHOR]

A strategy has been developed for the synthesis, characterization and catalysis of magnetic Fe3O4/P(GMA‐EGDMA)‐NH2/HPG‐COOH‐Pd core‐shell structure supported catalyst. The P(GMA‐EGDMA) polymer layer was coated on the surface of hollow magnetic Fe3O4 microspheres through the effect of KH570. The core‐shell magnetic Fe3O4/P(GMA‐EGDMA) modified by ‐NH2 could be grafted with HPG. Then, the hyperbranched glycidyl (HPG) with terminal ‐OH were modified by ‐COOH and adsorbed Pd nanoparticles. The hyperbranched polymer layer not only protected the Fe3O4 magnetic core from acid–base substrate corrosion, but also provided a number of functional groups as binding sites for Pd nanoparticles. The prepared catalyst was characterized by UV–vis, TEM, SEM, FTIR, TGA, ICP‐OES, BET, XRD, DLS and VSM. The catalytic tests showed that the magnetic Fe3O4/P(GMA‐EGDMA)‐NH2/HPG‐COOH‐Pd catalyst had excellent catalytic performance and retained 86% catalytic efficiency after 8 consecutive cycles. Fe3O4/P(GMA‐EGDMA)‐NH2/HPG‐COOH‐Pd microspheres are prepared with hyperbranched polymer layer, which can convent 4‐nitrophenol to 4‐aminophenol efficiently, and whose catalytic efficiency can still maintain up to 86% after eight cycles catalytic experiments. [ABSTRACT FROM AUTHOR]

The cover image is based on the Full Paper Preparation and characterization of magnetic hollow Fe3O4/P(GMA‐EGDMA)‐SO3H/Au‐PPy recyclable catalyst for catalytic reduction of 4‐nitrophenol by Na An et al., https://doi.org/10.1002/aoc.4739. [ABSTRACT FROM AUTHOR]

A highly effective and stable hollow Fe3O4/P(GMA‐EGDMA)‐SO3H/Au‐PPy catalyst was prepared. Monodisperse hollow Fe3O4 microspheres were synthesized using a hydrothermal method. As the catalyst support, magnetic hollow Fe3O4/P(GMA‐EGDMA) microspheres with core–shell structure were prepared by distillation precipitation polymerization. Then sulfonic acid groups (─SO3H) were introduced into the surface of the support by surface modification. Au3+ could be adsorbed by coordination with ─SO3H and underwent redox reactions with added pyrrole monomers. Finally, an Au–polypyrrole (PPy) layer was formed on the surface of the Fe3O4/P(GMA‐EGDMA)‐SO3H microspheres. The synthesized material was characterized using various techniques. Results indicated that the as‐prepared hollow Fe3O4/P(GMA‐EGDMA)‐SO3H/Au‐PPy catalyst had excellent catalytic activity and exhibited reusability for the reduction reaction of 4‐nitrophenol. In addition, the catalyst was reusable for at least ten successive cycles. A highly effective and stable hollow Fe3O4/P(GMA‐EGDMA)‐SO3H/Au‐PPy catalyst was prepared and characterized. The catalyst had excellent activity and exhibited reusability for the reduction reaction of 4‐nitrophenol. In addition, the catalyst was reusable for at least 10 successive cycles. [ABSTRACT FROM AUTHOR]