文献类型：期刊文献

英文题名：Z-scheme CdS-Au-BiVO4 with enhanced photocatalytic activity for organic contaminant decomposition

作者：Bao, Shenyuan[1,2];Wu, Qiangfang[1,2];Chang, Shunzhou[3];Tian, Baozhu[1,2];Zhang, Jinlong[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Mei Long Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, 130 Mei Long Rd, Shanghai 200237, Peoples R China;[3]Res Inst Phys & Chem Engn Nucl Ind, 168 JinTang Highroad, Tianjin 300180, Peoples R China

年份：2017

卷号：7

期号：1

起止页码：124

外文期刊名：CATALYSIS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20173304047457);WOS:【SCI-EXPANDED(收录号:WOS:000392399900011)】；

基金：This work has been supported by the National Natural Science Foundation of China (21277046, 21573069), the Shanghai Committee of Science and Technology (13NM1401000), and the National Basic Research Program of China (973 Program, 2013CB632403). We also thank the TEM Lab of Research Center of Analysis and Test of East China University of Science and Technology for kindly providing the TEM analysis.

语种：英文

外文关键词：Enamels - Gold compounds - High resolution transmission electron microscopy - II-VI semiconductors - X ray photoelectron spectroscopy - Photocatalysis - Electrons - Gold deposits - Scanning electron microscopy - Gold nanoparticles - Cadmium sulfide - Optical properties - X ray diffraction - Photocatalysts - Precipitation (chemical) - Field emission microscopes

摘要：A Z-scheme heterogeneous photocatalyst CdS-Au-BiVO4 was synthesized for the first time by photoreduction and deposition-precipitation methods. The microstructures and optical properties of the as-prepared samples were investigated by means of scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-vis diffuse reflectance spectroscopy (DRS). Due to the oriented accumulation of electrons on the {010} facets of BiVO4 crystals, Au nanoparticles were successfully anchored on the {010} facets of BiVO4 crystals via the photo-reduction process. CdS was further selectively deposited on the surface of Au nanoparticles, benefitting from the strong S-Au interaction. Photocatalytic degradations of tetracycline and Rhodamine B indicated that CdS-Au-BiVO4 exhibits much higher photocatalytic activity than BiVO4, Au-BiVO4, and CdS-BiVO4. Radical trapping experiments confirmed that in the case of CdS-Au-BiVO4, the main reactive species responsible for organic contaminant degradation are h(+), (OH)-O-center dot, and O-center dot(2-), while only h(+) can be produced in the case of CdS-BiVO4. Based on the photoelectrochemical analysis and radical trapping experiments, it can be deduced that the Z-scheme structure of CdS-Au-BiVO4 not only decreases the recombination rate of photo-generated carriers but also makes the holes and electrons keep a higher redox ability.