文献类型：期刊文献

英文题名：One-Pot Synthesis of W-TiO2/SiO2 Catalysts for the Photodegradation of p-Nitrophenol

作者：Arellano Sanchez, Ulises[1];Chen, Lifang[2];Wang, Jin An[2,3];Enrique Norena, Luis[3];Asomoza, Maximiliano[1];Solis, Silvia[1];Zhou, Xiaolong[4];Song, Yueqin[4];Liu, Jing[4]

机构：[1]Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Av San Rafael Atlixco 186, Mexico City, DF, Mexico;[2]Inst Politecn Nacl, ESIQIE, Av Inst Politecn Nacl S-N, Mexico City 07738, DF, Mexico;[3]Univ Autonoma Metropolitana Azcapotzalco, Dept Ciencias Basicas, Av San Pablo 180, Mexico City 02200, DF, Mexico;[4]East China Univ Sci & Technol, Inst Chem Engn, Int Joint Res Ctr Green Energy & Chem Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：2019

外文期刊名：INTERNATIONAL JOURNAL OF PHOTOENERGY

收录：;EI(收录号：20224112887237);WOS:【SCI-EXPANDED(收录号:WOS:000481910400001)】；

基金：We would like to thank the financial support from the projects of Instituto Politecnico Nacional (SIP-20181280 and SIP-20180199) and an international scientific collaboration between the International Joint Research Centre of Clean Energy and Chemical Engineering at the East China University of Science and Technology and the Instituto Politecnico Nacional in Mexico. J.A. Wang thanks the Departamento de Ciencias Basicas, Universidad Autonoma Metropolitana-Azcapotzalco for supporting his investigation during his Sabbatical year.

语种：英文

外文关键词：Catalyst activity - Energy gap - Irradiation - Phenols - Photocatalytic activity - Silica - Sol-gel process - Sol-gels - Tungsten compounds

摘要：Double modifications of TiO2 by doping with WO3 and by dispersing on a SiO2 support were made by the one-pot sol-gel method. Doping with W shifts the TiO2 band gap energy from 3.2 eV to around 3.06 eV. The surface area of the supported W-TiO2/SiO2 material was significantly increased, by approximately 3 times, in comparison to the bare TiO2. The photocatalytic activities of the catalysts were evaluated in the degradation reaction of p-nitrophenol in aqueous solution and basic medium. After 240 min of photodegradation, more than approximately 99% p-nitrophenol could be mineralized with the most active W-TiO2/SiO2 catalyst. Under UV irradiation, p-nitrophenol was initially photodegraded into hydroquinone and benzosemiquinone intermediates, which were further degraded into smaller fragments such as organic carboxylic acids and finally completely mineralized. A proposed photoreaction mechanism was presented based on the key roles of the surface hydroxyl species and superoxide radicals such as O-2(-) and (OH)-O-center dot, together with W6+/W5+ couples and e(-)/h(+) pairs in the catalysts in the p-nitrophenol photodegradation. The one-pot sol-gel synthesis method was proven to be effective to obtain W-TiO2/SiO2 catalyst with large surface area and high photocatalytic activity, and it can be also used for the preparation of other heterogeneous catalysts.