A TiO2/AC composite photocatalyst with high activity and easy separation prepared by a hydrothermal method
A TiO2/AC composite photocatalyst with high activity and easy separation prepared by a hydrothermal method
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DOI：
10.1016/j.jhazmat.2006.09.026
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发表时间：
2007-05-08
影响因子：
13.6
通讯作者：
Chen, X.
中科院分区：
文献类型：
--
作者：
Liu, S. X.;Chen, X. Y.;Chen, X.
本工作采用水热法制备了高活性、易分离的二氧化钛/活性炭光催化剂。以苯酚、甲基橙(MO)和铬(VI)为目标污染物，测定其活性和降解能力。用扫描电子显微镜、X射线衍射仪、傅立叶变换红外光谱、漫反射光谱(UV/DRS)和N-2吸附等温线对其晶体结构和电子结构进行了表征。结果表明，AC复合材料对TiO2光催化活性有显著影响。在合适的AC含量下，制备的TiO2xAc催化剂具有较高的催化活性。Ti02/5Ac催化剂具有易分离、多次循环失活少、对pH变化不敏感等特点。UV/DRS结果表明，AC的加入对二氧化钛的电子带隙没有影响。扫描电子显微镜和X射线衍射仪的结果表明，当AC含量达到最佳时，可以得到较好的二氧化钛分布。AC块体与二氧化钛之间形成了Ti-O-C键，并出现了轻微的偶联效应。所制得的TiO2/5Ac催化剂的优点显示了其在废水处理中的巨大应用潜力。(C)2006爱思唯尔B.V.保留所有权利。
In the present work, a TiO2/activated carbon (AC) photocatalyst with high activity and easy separation was prepared using a hydrothermal method. Phenol, methyl orange (MO) and Cr(VI) were used as target pollutants to test the activity and decantability. SEM, XRD, FTIR, diffuse reflectance spectra (UV/DRS) and N-2 adsorption isotherms were used to characterize the crystalline and electronic structure. Results show that the AC composite has a significant effect on the TiO2 activity. With suitable AC content, the TiO2/xAC catalysts prepared were much more active. The TiO2/5AC catalyst exhibited easy separation and less deactivation after several runs, and was less sensitive to pH changes. UV/DRS revealed that no electronic bandgap changes in TiO2 occurred on addition of the AC. SEM and XRD results suggest that better TiO2 distribution can be achieved when an optimal AC content is used. A Ti-O-C bond was formed and a slight conjugation effect appeared between the AC bulk and TiO2. The advantages of the obtained TiO2/5AC catalyst revealed its great practical potential in wastewater treatment. (C) 2006 Elsevier B.V. All rights reserved.