文献类型：期刊文献

英文题名：Tailored preparation of titania with controllable phases of anatase and brookite by an alkalescent hydrothermal route

作者：Shen, Xiaojun;Tian, Baozhu;Zhang, Jinlong[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：201

期号：1

起止页码：151

外文期刊名：CATALYSIS TODAY

收录：;EI(收录号：20125015803300);WOS:【SCI-EXPANDED(收录号:WOS:000311939200024)】；

基金：This work has been supported by National Nature Science Foundation of China (Nos. 21007016 and 20977030), the Project of International Cooperation of the Ministry of Science and Technology of China (No. 2011DFA50530), Science and Technology Commission of Shanghai Municipality (Nos. 10520709900 and 10JC1403900) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Anatase; Brookite; Photocatalytic activity; NaCl

摘要：Titanium dioxide (TiO2) with different ratio of anatase to brookite has been selectively synthesized by an alkalescent hydrothermal treatment of TiCl3 in the presence of different concentration of NaCl. The resulting powders have been characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) analysis, UV-vis diffuse reflectance spectra (DRS), and Brunauer-Emmett-Teller (BET) analysis. The contents of anatase and brookite have been successfully controlled by adjusting the NaCl concentration and NH4OH/H2O volume ratio. The photocatalytic activity of TiO2 has been assessed by the degradation of Rhodamine B in aqueous solution. The mixed-phase TiO2 exhibits higher activity than pure phase TiO2, and the product containing 53.4% brookite and 46.6% anatase shows the highest photocatalytic activity. This behavior is explained by the mixed-phase effect between anatase and brookite. A proposed formation process is discussed to interpret the evolution of the phases based on the effects of different NaCl concentration and NH4OH/H2O volume ratio. (C) 2012 Elsevier B. V. All rights reserved.