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Rare Metals 2024年第8期43卷 3758-3770页

作者： Jiang-Yu-Shan Liang Hai-Tao Ren Abdelkader Labidi Qiu-Hui zhu Qi-Bing Dong Ahmed A.Allam Ahmed Rady Chuan-Yi Wang School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China zoology Department Faculty of ScienceBeni-Suef UniversityBeni-Suef 6251lEgypt Department of zoology College of ScienceKing Saud University11451 RiyadhSaudi Arabia

In practical applications,relative humidity in the air is a key factor affecting the photocatalytic removal of NO,which is often overlooked in previous ***,we developed a direct z-scheme UiO-66-NH_(2)/Bi_(2)MoO_(6)heterojunction with a nanoflower-like structure to systematically investigate the effect of relative humidity on photocatalytic removal of *** optimized heterojunction for the removal efficiency of NO was 71.6%at1.07 mg·m^(-3)NO concentration(relative humidity=10%),and the generation of NO_(2) was only 1.1%.Interestingly,with the increase in relative humidity,it showed a higher inhibition effect on NO_(2),while the removal of NO decreased slightly(8%),which might be attributed to the affinity effect of NO_(2) with water molecules and the competitive adsorption of H_(2)O and NO on the surface of the heterojunction ***,the reaction pathways of NO removal at the developed heterojunctions were revealed by in situ DRIFTS *** work provides a novel vision for the development of direct z-scheme heterojunction photocatalysts to effectively remove NO and inhibit the formation of toxic intermediate NO_(2) under different humidities.

关键词： NO removal Relative humidity direct z-scheme Bismuth molybdate Visible-light photocatalysis

Theoretical progress on direct z-scheme photocatalysis of two-dimensional heterostructures

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Frontiers of physics 2021年第4期16卷 125-133页

作者： zhaobo zhou Shijun Yuan Jinlan Wang School of Physics Southeast UniversityNanjing 211189China

Two-dimensional(2D)materials,due to its excellent mechanical,unique electrical and optical properties,have become hot materials in the field of ***,2D heterostructures can well inhibit the recombination of photogenerated electrons and holes in photocatalysis because of its special energy band structures and carrier transport characteristics,which are conducive to enhancing photoenergy conversion capacity and improving oxidation and reduction ability,so as to purify pollutants and store *** this minireview,we summarize recent theoretical progress in direct z-scheme photocatalysis of 2D heterostructures,focusing on physical mechanism and improving catalytic *** challenges and prospects for 2D direct z-scheme photocatalysts are discussed as well.

关键词： two-dimensional heterostructures direct z-scheme photocatalyst density functional theory

Construction of direct z-scheme BPQDs-modified BiOBr thin film for enhanced photocatalytic performance under visible light irradiation

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Journal of Materiomics 2021年第5期7卷 1122-1130页

作者： ziyu Yao Huajun Sun Yunlong Hu Xiaofang Liu Yong zhang State Key Laboratory of Silicate Materials for Architectures Center for Smart Materials and Device IntegrationSchool of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China School of Chemistry Chemical Engineering and Life SciencesWuhan University of TechnologyWuhan430070China Advanced Ceramics Institute of zibo New&High-Tech Industrial Development zone Zibo255000China

Surface modification on photocatalytic thin films is long considered as an effective strategy to improve the degradation performance,which in turn helps to alleviate the worldwide environmental pollution *** this study,a direct z-scheme photocatalytic system is constructed successfully by integrating black phosphorus quantum dots(BPQDs)on the surface of BiOBr thin film prepared by hydrothermal *** optimal BPQDs/BiOBr-1 thin film presents remarkable enhanced photocatalytic activity for degrading methyl violet(MV)and tetracycline hydrochloride(TC),which is 3 and 3.65 times higher than that of pure BiOBr *** active species involved in the reaction are ^(+),·O_(2)^(-),and·OH,which determined by radical trapping *** formation of direct z-scheme photocatalytic system makes electrons assembled in the conduction band(CB)of BPQDs and holes gathered in the valence band(VB)of BiOBr,which supports the generation of h^(+) and·O_(2)^(-) and in turn accelerates the photocatalytic ***,the improved efficiency of charge separation,enhanced visible light absorption and enlarged specific surface area also contributed to the enhanced photocatalytic performance of BPQDs/*** work provides a feasible strategy for optimizing photocatalytic thin films via detailed analyzing the role of BPQDs in the construction of direct z-scheme photocatalysts.

关键词： Photocatalytic thin films direct z-scheme Surface modification BPQDs BiOBr

direct z-scheme CdS-CdS Nanorod Arrays Photoanode: Synthesis,Characterization and Photoelectrochemical Performance

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Chinese Journal of Chemical Physics 2019年第6期32卷 715-720,I0003,I0025-I0031页

作者： Yi Fan zhi-min Song Jing-jing Dong zhi-yu Wang Yue Yang Xiao-di zhu Song Sun Chen Gao Jun Bao National Synchrotron Radiation Laboratory Collaborative Innovation Center of Chemistry for Energy MaterialsUniversity of Science and Technology of ChinaHefei 230029China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Beijing Advanced Sciences and Innovation Center Chinese Academy of SciencesBeijing 101407China

direct z-scheme CdO-CdS 1-dimensional nanorod arrays were constructed through a facile and simple hydrothermal process. The structure, morphology, photoelectrochemical properties and H2 evolution activity of this catalyst were investigated systematically. The morphology of the obtained nanorod is a regular hexagonal prism with 100-200 nm in diameter. The calcination temperature and time were optimized carefully to achieve the highest photoelectrochemical performance. The as-fabricated hybrid system achieved a photocurrent density up to 6.5 mA/cm2 and H2 evolution rate of 240 μmol·cm-2·h-1 at 0 V vs. Ag/AgCl, which is about 2-fold higher than that of the bare CdS nanorod arrays. The PEC performance exceeds those previously reported similar systems. A direct z-scheme photocatalytic mechanism was proposed based on the structure and photoelectrochemical performance characterization results, which can well explain the high separation efficiency of photoinduced carriers and the excellent redox ability.

关键词： direct z-scheme CdO-CdS One-Dimensional nanorod arrays PEC performance H2 evolution rate

Defect-assisted surface modification enhances the visible light photocatalytic performance of g-C_3N_4@C-TiO_2 direct z-scheme heterojunctions

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Chinese Journal of Catalysis 2019年第3期40卷 424-433页

作者： Xibao Li Jie Xiong Ying Xu zhijun Feng Juntong Huang School of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 Jiangxi China School of Physics and Electronic Science Hunan University of Science and Technology Xiangtan 411201 Hunan China

To increase the number of active sites and defects in TiO2 and promote rapid and efficient transfer of photogenerated charges, a g-C3N4@C-TiO2 composite photocatalyst was prepared via in situ deposition of g-C3N4 on a carbon-doped anatase TiO2 surface. The effects of carbon doping state and surface modification of g-C3N4 on the performance of g-C3N4@C-TiO2 composite photocatalysts were studied by X-ray diffraction, X-ray photoelectron spectroscopy, UV-visible diffuse-reflectance spectroscopy, transmission electron microscopy, electrochemical impedance spectroscopy, photoluminescence, and electron paramagnetic resonance. With increasing carbon doping content, the carbon doping state in TiO2 gradually changed from gap to substitution doping. Although the number of oxygen vacancies gradually increased, the degradation efficiency of g-C3N4@C-TiO2 for RhB (phenol) initially increased and subsequently decreased with increasing carbon content. The g-C3N4@10C-TiO2 sample exhibited the highest apparent reaction rate constant of 0.036 min儃1 (0.039 min儃1) for RhB (phenol) degradation, which was 150 (139), 6.4 (6.8), 2.3 (3), and 1.7 (2.1) times higher than that of pure TiO2, 10C-TiO2, g-C3N4, and g-C3N4@TiO2, respectively. g-C3N4 was grown in situ on the surface of C-TiO2 by surface carbon hybridization and bonding. The resultant novel g-C3N4@C-TiO2 photocatalyst exhibited direct z-scheme heterojunctions with non-local impurity levels. The high photocatalytic activity can be attributed to the synergistic effects of the improved visible light response ability, higher photogenerated electron transfer efficiency, and redox ability arising from z-type heterojunctions.

关键词： Photocatalyst Heterojunction direct z-scheme Doping Modification

Room-temperature solid phase surface engineering of BiOI sheets stacking g-C_(3)N_(4) boosts photocatalytic reduction of Cr(Ⅵ)

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Green Energy & Environment 2022年第1期7卷 66-74页

作者： Xin zhang Weiwei Yang Manyi Gao Hu Liu Kefei Li Yongsheng Yu MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinHeilongjiang150001China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbinHeilongjiang150090China

Cr(Ⅵ)-based compounds pollution have attracted global concern due to serious harm to humans and ***,it is crucial to exploit an effective technique to eliminate Cr(Ⅵ)in ***,we in-situ grown BiOI on graphitic carbon nitride to prepare the BiOI/g-C_(3)N_(4)(BCN)direct z-scheme heterojunction by solid phase engineering method at room *** result shown the photocatalytic activity of pure BiOI were obviously enhanced by constructing z-scheme BCN heterostructure,and BCN-3 heterostructure exhibited the optimal photocatalytic degradation of RhB with 98%yield for 2.5 h and reduction of Cr(Ⅵ)with more than 99%yield for 1.5 h at pH=*** test shows BCN-3 still kept more than 98%reduction efficiency after 6 *** addition,we also studied the reduction mechanism that shown the.O_(2)^(-)radicals essentially helped to reduce the Cr(Ⅵ)in aqueous solution under illumination,verified the direct z-scheme charge transfer path by X-ray photoelectron spectroscopy(XPS)and the free radical trapping *** work open a new way for rationally designing photocatalyst heterostructure to reduce Cr(Ⅵ)to Cr(Ⅲ).

关键词： BiOI/g-C_(3)N_(4) Photocatalytic reduction Solid phase direct z-scheme Cr(Ⅵ)reduction