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Homogeneous nitrogen-doped(111)-type layered Sr5Nb4O15-xNx as a visible-light-responsive photocatalyst for water oxidation

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Nano Research 2022年第12期15卷 9976-9984页

作者： Shiwen Du Hai Zou Yunfeng Bao Yu Qi Xueshang Xin Shuowen Wang Zhaochi Feng Fuxiang Zhang State Key Laboratory of Catalysis Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing100049China

The development of visible-light-responsive photocatalysts for promoting solar-driven oxygen(O2)production from water splitting is a potentially attractive but still a challenging *** the present work,a(111)-type layered perovskite oxynitride,Sr5Nb4O15-xNx,was synthesized via the nitridation treatment of the disk-like oxide precursor under the ammonia flow,which was fabricated using a flux *** homogeneous dispersion of nitrogen(N)dopant in N-doped Sr5Nb4O15 was ascertained by energy-dispersive X-ray spectroscopy characterization,and the Sr5Nb4O15-xNx was found to be a direct semiconductor with a light absorption edge of approximately 640 *** functional theory investigation implies that the hybridization between the outmost N 2p orbitals and O 2p orbitals upshifts the original valence band maximum of Sr5Nb4O15 and endows its visible-light-responsive *** with cobalt oxide(CoOx)as cocatalyst,the as-prepared Sr5Nb4O15-xNx exhibited an enhanced photocatalytic O2 evolution activity from water splitting under visible-light illumination(λ>420 nm).Moreover,another homogeneous N-doped layered perovskite-type niobium(Nb)-based oxynitride,Ba5Nb4O15-xNx,was also developed and investigated for the visible-light-actuated O2 production,highlighting the versatility of the present approach for exploring novel visible-light-responsive photocatalysts.

关键词： nitrogen-doped visible-light-responsive layered perovskite oxygen(O2)evolution water splitting

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Synthesis, characterization and photocatalytic application of H_3PW_(12)O_(40)/BiVO_4 composite photocatalyst

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Science China Chemistry 2013年第9期56卷 1285-1292页

作者： ZHANG Jin LI Chuang WANG Bing CUI Hao ZHAI JianPing LI Qin State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing University School of Biochemical and Environmental Engineering Nanjing Xiaozhuang University

A series of H3PW12O40/BiVO4 composite with different H3PW12O40 loadings were prepared using a hydrothermal and impregnation method. The prepared composites were characterized by XRD, Raman, SEM, XPS, and DRS techniques. The bandgap of the composite was narrower compared with the as-prepared pure BiVO4 . As a novel photocatalytic material, the photocatalytic performance of the H3PW12O40/BiVO4 composite was investigated by the degradation of methylene blue (MB) dye solution under visible light irradiation and compared with that of pure BiVO4 . The results revealed that the introduction of H3PW12O40 could improve the photocatalytic performance and different concentrations of H3PW12O40 resulted in different photocatalytic activities. The highest activity was obtained by the sample with a loading HPW concentration of 10 wt%. The reason for the enhanced photocatalytic activities of H3PW12O40/BiVO4 samples was also discussed in this paper. Moreover, the H3PW12O40/BiVO4 composites retained the catalytic activity after four repeated experiments.

关键词： bismuth vanadate (BiVO 4 ) heteropoly acid (HPA) photocatalysis visible-light-responsive composite materials

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0D/1D AgI/MoO_(3)Z-scheme heterojunction photocatalyst:Highly efficient visible-light-driven photocatalyst for sulfamethoxazole degradation

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Chinese Chemical Letters 2021年第10期32卷 3226-3230页

作者： Jing Xu Juan Chen Yanhui Ao Peifang Wang Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education College of EnvironmentHohai UniversityNanjing 210098China

Low dimension nano photocatalysts show great potential in the field of treating contaminated water for their large surface area and size *** this study,a 0 D/1 D AgI/MoO_(3)Z-scheme photocatalyst with striking photocatalytic performance was constructed *** one-dimensional MoO_(3)nanobelts were prepared by a simple hydrothermal method,and then it was modified by AgI nanoparticles in a handy deposition *** choosing sulfamethoxazole(SMZ)as the target contaminant,the rate constant value of the optimal 0 D/1 D AgI/MoO_(3)composite could hit up to 0.13 min^(-1),which is nearly 22.4 times and 32.5 times as that of pure MoO_(3)(0.0058 min^(-1))and AgI(0.0040 min^(-1)),respectively.A series of detailed characterizations give evidences that the charge transfer in the composite followed Z scheme ***,efficient separation/transfer and the remained high redox activity of photogenerated carriers played a vital role in the sharply enhanced photocatalytic *** possible degradation pathways of SMZ were proposed based on the intermediates detected by high-performance liquid chromatography-mass spectrometry(HPLC-MS).Meanwhile,the magnificent cyclic stability makes the material a promising material in the practical application.

关键词： MoO_(3)-based-photocatalyst 0D/1D Z-scheme Sulfamethoxazole visible-light-responsive

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