JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 19
·9704-9713
·
IF 5.968
Gang Liu,Quan Deng,Hongqiang Wang,Dickon H. L. Ng,Mingguang Kong,Weiping Cai,Guozhong Wang
Micro/nanostructured α-Fe2O3 spheres (MNFSs) were fabricated via a surfactant- and template-free method, involving the hydrothermal synthesis of FeCO3 precursor firstly and a subsequent thermal decomposition treatment. The product was characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. The MNFSs had an average diameter of about 5 μm, and each contained subunits of interlinked and elongated particles with size less than 30 nm. The UV-Vis spectrum of MNFSs exhibited visible-light absorption. The visible-light photocatalytic activity of MNFSs was evaluated by using them to degrade the rhodamine 6G pollutant in water at ambient temperature under different parameters such as pH value, the amount of MNFSs and H2O2. We also found that the visible-light photocatalytic activity of MNFSs was higher than that of the micron- and nano-sized α-Fe2O3 particles. The reaction rate of MNFSs was more than twice that of nano-sized α-Fe2O3 and nearly 12 times faster than that of the micron-sized α-Fe2O3. This high photocatalytic feature of MNFSs was attributed to the high specific surface area together with their special porous structure. Importantly, these characteristics could control the rate of releasing ·OH and thus improve the utilization efficiency of ·OH. MNFSs can be easily recycled from the treated water using a magnet due to its magnetic behavior. There was no obvious decrease of the photocatalytic activity of MNFSs after being used.
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CURRENT APPLIED PHYSICS
·
2012
·
IF 1.9
Peisong Tang,Yi Tong,Haifeng Chen,Feng Cao,Guoxiang Pan
Single phase perovskite LaFeO 3 nanoparticles are directly synthesized by a one-step microwave-assisted route without additional high temperature calcination process. The prepared sample is characterized by X-ray diffraction (XRD), field emission scanning microscope (FE-SEM), Brunauer–Emmett–Teller (BET) specific surface area measurement, diffuse reflectance spectroscopy (DRS) and Fourier transform infrared spectroscopy (FTIR). XRD and SEM show that the prepared LaFeO 3 is single phase perovskite and sphere-like shape. The DRS result shows that the prepared LaFeO 3 has strong visible-light absorption and an optical absorption onset of 525 nm, corresponding to an optical band gap of 2.36 eV. The photocatalytic experiment demonstrates that LaFeO 3 is highly visible-light photocatalytic active for the degradation of methylene blue. It is suggested that the narrow band gap and the strong visible-light absorption are responsible for the high visible-light photocatalytic activity of the prepared LaFeO 3 .
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CRYSTENGCOMM
·
2012
·Vol. 14
·期 17
·5627-5633
·
IF 3.842
Xianlong Zhou,Tengfei Zhou,Juncheng Hu,Jinlin Li
Novel SnO2 nanoparticle-decorated SnS2 nanosheets were synthesized via a one-pot solvothermal process using SnCl4·5H2O and CH4N2S as precursors. SnS2@SnO2 nanosheets were characterized by XRD, TEM, FESEM, XPS and UV-vis diffuse reflectance spectra (DRS). The band-gap of SnO2@SnS2 can be easily tuned by the controlled experimental strategy. Anisole and ethanol with different volume ratios were used as binary solvent to tune the composition of SnS2@SnO2 nanocomposites (NCs) continuously and the composites gradually change from hexagonal SnS2 into tetragonal SnO2. All of the SnS2@SnO2 nanosheets exhibited enhanced visible light photocatalytic activity, which was remarkably superior to SnS2, SnO2 and Degussa P-25. The obtained SnS2@SnO2 NCs with Vethanol/Vanisole = 1 : 2 showed the best photocatalytic capability. Furthermore, the formation mechanism of SnS2@SnO2 nanosheets has also been discussed.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 5
·1989-1998
·
IF 3.5
Yanshu Liu,Guanyun Zhang,Dexin Wang,Guanjie Chen,Fangfang Gao,Chen-Ho Tung,Yifeng Wang
A cryptand-like Ti-coordination compound, namely Ti12Cs, comprising two Ti6-salicylate cages and hosting two Cs+ ions, was synthesized by the solvothermal method. It exhibits strong visible-light absorption with an absorption band edge of 652 nm, attributed to the electron transition from salicylate ligands to Ti ions. Electrochemical impedance, visible-light transient photocurrent response, and photoluminescence spectra confirm that Ti12Cs has excellent visible-light response and charge-separation properties. Ti12Cs can be used as a heterogeneous and recyclable photocatalyst for CO2/epoxide cycloaddition, with high utilization efficiency of visible-light under mild conditions. The mechanism investigation points to a synergistic effect of photocatalysis and Lewis acid catalysis.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Xiaoyu Jia,Kaiting He,Ling Cai,Yuhui Liu,Henghui Li,Xiaoxiao Dong,Min He,Li Zhang,Guannan Le,Shoulin Wang,Jin Chen
Nowadays, the rapid emergence of drug-resistant bacteria has posed a global threat to the public health, leading to increased cost of environmental hygiene and healthcare treatment, which urges the development of safe and efficient antibacterial strategies. Here, coaxially fabricated electrospun nanofibrous membrane (ENMs) consisted of quercetin (Qu) stabilized selenium nanoparticles (Qu@SeNPs) and electro-synthesized molybdenum disulfide (MoS 2 ) nanosheets were facilely formed as core/shell structure with polyvinyl alcohol (PVA) and α-Lipoic acid (LA) as cross-linker. The obtained ENMs formed by core-shell PVA/MoS 2 /LA/Qu@SeNPs (PMLQS) showed good air permeability and near-infrared-light photothermal responsiveness to kill bacteria efficiently. Moreover, the obtained ENMs resembling extracellular matrix-like properties showed superior biocompatibility with negligible development toxicity of zebrafish. The antibacterial experiments indicated that the produced PMLQS fibrous membrane exhibited more pronounced bactericidal activity against Gram-positive (G + ) Staphylococcus aureus ( S. aureus ) and methicillin-resistant S. aureus ( MRSA ) as compared to that of Gram-negative (G - ) Escherichia coli ( E. coli ). Furthermore, transcriptomic analysis revealed MRSA inactivation by PMLQS ENMs involved disruption of ion transport, antioxidant system, carbohydrate metabolism and energy metabolism. Notably, the MRSA ADI pathway was also blocked supporting the minimized antibiotic resistance development. Therefore, the constructed near-infrared light-responsive PMLQS nanofibrous membrane held promise in tackling drug-resistant bacteria with enormous environmental and biomedical utilizations.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zhenxin Kuang,Junchao Liu,Weihao Meng,Tomiki Ikeda,Jingxia Wang,Lei Jiang
Azobenzene-mesogen photo-actuator is frequently utilized in diverse bionic motions due to their unparalleled advantages of wireless and reversible actuation. The realm of jumping behavior remains unexplored for azobenzene-based actuators. Inspired by the Click-beetles, here a Janus light-driven jumping robot is achieved through the integration effect of an azobenzene molecule (with a short thermal relaxation time) and a splay alignment. The prepared Azobenzene liquid crystal films exhibit remarkable light-driven continuous jumping capabilities, with jumping heights of 35 body lengths (BL) and takeoff speeds of 0.67 m s −1 (670 BL s −1 ), these data currently surpass the performance of small-mass jumping robots. This research will be helpful for the design of novel actuators and broaden of the application scenarios of azobenzene actuators.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Shuang Guo,Shuxue Zhou,Huijing Li,Bo You
This paper presents a facile method to fabricate volumetric light diffusing films with high transmittance and haze simultaneously by mimicking the micro- and nanostructure of compound eyes. Strawberry-like polymethyl methacrylate/SiO 2 composite microspheres were first prepared via the electrostatic attraction between positively charged PMMA spheres and negatively charged SiO 2 nanoparticles , and further blended with polyacrylate latex to produce light diffusing coatings. A novel light diffusing film with hemispherical surface was built by casting the light diffusing coatings on optical-grade PET film. Effects of the sizes of PMMA spheres and SiO 2 nanoparticles on the optical properties of light diffusing film were investigated by a haze meter and application on a LED lamp. The best result (transmittance 94.6% and haze 84.2%) was achieved for the strawberry-like composite microspheres based on 1 μm PMMA spheres and 50 nm SiO 2 nanoparticles. The light-diffusing mechanism of the strawberry-like microspheres in the film was discussed.
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ChemistrySelect
·
2025
·Vol. 10
·期 8
·e202405010
·
IF 2
Yujun Liu,Meng Lan,Xiaoli Dong,Nan Zheng,Jialin Gou
Graphical A novel type II CoWO 4 /Cd 0.5 Zn 0.5 S heterostructure photocatalyst is constructed by a simple secondary hydrothermal method and applied for the efficient photodegradation of rhodamine B (RhB) and methyl orange (MO) under visible light irradiation. The expansion of visible light absorption and dense interfacial contact contributes to the excellent photodegradation activity toward RhB and MO. The ecosystems and human health have been gravely impacted by growing organic pollutants and photocatalysis and is regarded as one of the most valid and green governance approaches. Herein, a novel type II CoWO 4 /Cd 0.5 Zn 0.5 S (CWO/CZS) heterojunction photocatalyst was constructed by a secondary hydrothermal method and applied to the photodegradation of rhodamine B (RhB) and methyl orange (MO). The experimental results show that the CWO/CZS heterojunction photocatalyst exhibits excellent photodegradation activity toward RhB and MO under visible light irradiation. CWO/CZS (0.10:1) achieved a degradation efficiency of 96.7% for RhB within 15 min and the apparent rate constants were 135 and 5 times of CWO and CZS, respectively. The high photodegradation rate of MO also demonstrates its excellent photocatalytic activity. The significant improvement in the photocatalytic degradation rate originated from the expansion of visible light absorption and dense interfacial contact between the nanoparticles, which could effectively accelerate the transfer of photogenerated charges. This work demonstrates a novel type II heterojunction photocatalyst for the effective removal of organic dyes, providing fresh ideas for wastewater purification.
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NANOTECHNOLOGY
·
2017
·Vol. 28
·期 14
·145101
·
IF 3.44
Shiqiang Chai,Yu Guo,Zhenyu Zhang,Zhen Chai,Yurong Ma,Limin Qi
Long wavelength light-responsive drug delivery systems based on mesoporous silica nanoparticles (MSNs) have attracted much attention in the last few years. In this paper, a red light (660 nm)-responsive drug delivery system based on low-cost cyclodextrin (CD)-gated MSNs containing a photodynamic therapy (PDT) photosensitizer (Chlorin e6, Ce6) was developed for the first time. The drug release experiment in water demonstrated that with the irradiation of red light, Ce6 can be excited to generate singlet oxygen, which can further cleave the singlet oxygen sensitive linker to trigger the departure of CD and the release of cargo. Further in vitro release experiments confirmed that cargo can be released from MSNs with the irradiation of red light and spread into the entire cell. The relative low power density (0.5 W cm−2) of excitation light together with the short irradiation time (one–three min) result in a low light dose (30–90 J cm−2) for the drug delivery, contributing to their potential clinical applications.
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Inorganic Chemistry Frontiers
·
2016
·Vol. 3
·期 7
·934-943
·
IF 4.532
Xiankun Shao,Benxia Li,Baoshan Zhang,Liangzhi Shao,Yongmeng Wu
Constructing a core–shell nanostructured photocatalyst by integration of plasmonic metal nanocrystals and a semiconductor can offer large active metal/semiconductor interfacial areas and avoid aggregation of the metal nanocrystals. Herein, well-defined Au@ZnO core–shell nanostructures were prepared by coating ZnO on cetyltrimethylammonium bromide (CTAB) stabilized Au nanospheres in aqueous solution. The resultant core–shell nanostructures have Au-nanosphere cores with a diameter of ∼55 nm and ZnO shells with a thickness of ∼50 nm. After calcination at 350 °C in air, the mesoporous ZnO shell with higher crystallinity and a larger surface area was obtained without any significant change in the morphology or plasmon band of Au@ZnO. The specific surface plasmon resonance of the Au-nanosphere cores endows the Au@ZnO nanostructures with strong visible light absorption around 550 nm. The photocatalytic degradation of an organic pollutant was performed under simulated sunlight and monochromatic LED light with three different wavelengths (365 nm, 520 nm, 660 nm), demonstrating the enhanced photocatalysis of the Au@ZnO nanostructures. Furthermore, the Au@ZnO as a photoelectrode material presents a higher photocurrent density than that of pure ZnO nanoparticles under simulated sunlight. The electrochemical impedance spectra (EIS) Nyquist plots also confirm the higher charge transfer efficiency of the Au@ZnO nanostructures. Such plasmonic metal–semiconductor core–shell nanostructures would provide a desirable platform for studying plasmon-induced/enhanced processes and have great potential in light-harvesting applications.
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Energies
·
2016
·Vol. 9
·期 10
·764
·
IF 2.077
Yuxue Zhou,Xiangdong Meng,Ling Tong,Xianghua Zeng,Xiaobing Chen
Highly hierarchical hollow bismuth tungstate (Bi2WO6) microspheres self-assembled by thin nanoplates have been fabricated via a facile template-free solvothermal route. The possible growth pattern and formation mechanism of hierarchical hollow Bi2WO6microspheres was investigated. The excellent visible-light-driven photocatalytic performance on rhodamine B (RhB) degradation was displayed by hierarchical hollow Bi2WO6microspheres. Such well-organized hierarchical hollow Bi2WO6microspheres show potential application in water treatment fields by full use of solar energy.Keywords:bismuth tungstate (Bi2WO6);semiconductor photocatalyst;visible-light-driven;water treatment
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Jianwei Li,Xiang Li,Yan Liu,Jie Zhang
The application of ionic liquids as alternatives to conventional organic solvents in the extraction process has been investigated. In the present study, fourteen species of imidazolium-based ionic liquids were added into the NaOH (aq) to remove the mercaptans. The influences of anion species and cation alkyl chain length of the imidazolium-based ionic liquids on the performance of mercaptan removal from light oils have been discussed. The efficiency of extraction for mercaptans exhibited the order of [Ac] − > [OH] − ≈ [Br] − > [BF 4 ] − . The longer alkyl chain imidazolium-based ionic liquids contributed to enhance desulfurization rate of 1-butyl mercaptan. 100% desulfurization rate of 1-butyl mercaptan was achieved by the anion of Ac − ionic liquids and NaOH (aq) at a volume ratio of 40:1 ( V (oil): V (ionic liquid)) and a short equilibrium time within 10 min.
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危险品化学品经营许可证（带存储）