文献类型：期刊文献

英文题名：Construction of bimetallic co-doped ordered mesoporous MxCey/(TiO2)z@SiO2 aerogel composite material and its photocatalytic performance under visible light

作者：Zhang, Guifei Tang, Shiyun Tang, Anjiang

第一作者：Zhang, Guifei

机构：[1] College of Chemistry and Chemical Engineering, Guizhou University, Guizhou, Guiyang, 550025, China; [2] Guizhou Institute of Technology, Guizhou, Guiyang, 550003, China

第一机构：College of Chemistry and Chemical Engineering, Guizhou University, Guizhou, Guiyang, 550025, China

年份：2023

卷号：106

期号：1

起止页码：265-280

外文期刊名：Journal of Sol-Gel Science and Technology

收录：EI(收录号：20230313388688);Scopus(收录号：2-s2.0-85146160208)

语种：英文

外文关键词：Adsorption - Atmospheric pressure - Catalyst activity - Degradation - Energy dispersive spectroscopy - Energy gap - Groundwater - Groundwater pollution - Light absorption - Light sources - Mesoporous materials - Metal ions - Organic pollutants - Photocatalytic activity - Rare earths - Scanning electron microscopy - Silica - Sol-gels - Titanium dioxide - Transition metal oxides - Transition metals - X ray photoelectron spectroscopy

摘要：Abstract: Dye (such as Rhodamine B) is an organic pollutant, which has become a serious environmental pollution problem due to its pollution of soil, groundwater, aquatic ecosystem and biological health. In this study, bimetallic co-doped ordered mesoporous MxCey/(TiO2)z@SiO2 aerogel composites were prepared by sol-gel combined with atmospheric pressure drying method. The synthesized catalysts were characterized by scanning electron microscope, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N2 adsorption techniques, fluorescence spectra, transmission electronic microscope and ultraviolet visible diffuse reflectance spectroscopy. Rhodamine B was used as a simulated organic pollutant, and the photocatalytic degradation activity of aerogel catalysts was evaluated under visible light. The results show that all the catalysts have good adsorption capacity, and the adsorption rate is up to 30–50% due to the large specific surface area of SiO2 aerogel carrier. When the metal ion is 5 mol%, the optimum doping concentration of titanium is 60 mol%. The catalysts containing Y and Zn showed the best catalytic performance, and the degradation rate reached about 98% after 180 min of photoreaction. The doping of appropriate amount of rare earth elements and transition metal elements not only contributes to light absorption and matrix adsorption, promotes the formation of hydroxyl radicals, but also reduces the band gap of the catalyst and has high photogenerated carrier transfer efficiency. Therefore, the visible light degradation performance of the catalyst is obviously improved. Graphical abstract: The picture consists of three parts: first, the preparation of the catalysts (various raw materials are stirred continuously and adjusted pH, and then the catalyst is obtained by solvent exchange, drying and roasting); second, the catalytic process (catalysis is carried out in a dark box with a visible light source); third, the possible mechanism of catalysis.[Figure not available: see fulltext.]. ? 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.