Synthesis and Characterization of Rectorite/ZnO/TiO2 Composites and Their Properties of Adsorption and Photocatalysis for the Removal of Methylene Blue Dye  

作　　者：王欢欢 周培疆 WANG Jia WANG Yifei WEI Junchong ZHAN Hongju GUO Rui ZHANG Yali 

机构地区：[1]School of Resource and Environmental Science, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Eco-environment Technology R&D and Service Center, Wuhan University, Wuhan 430079, China [2]School of Materials Science and Engineering, Wuhan University of Technllogy [3]Jingchu University of Technology, Jingmen 448000, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第3期729-735,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National High Technology Research and Development Program of China(No.2007AA06Z418);the National Natural Science Foundation of China(Nos.20577036,20777058,20977070);the National Natural Science Foundation of Hubei Province,China(No.2015CFA137);the Open Fund of Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory(Wuhan University);the Fund of Eco-environment Technology R&D and Service Center(Wuhan University)

摘　　要：As efficient water treatment agents, a novel series of rectorite-based ZnO and TiO2 hybrid composites（REC/ZnO/TiO2） were synthesized and characterized in this study. Effects of experimental parameters including TiO2 mass ratio, solution p H and catalyst dosage on the removal of methyl blue（MB） were also conducted. The presence of a little mass ratio（2%-6%） of TiO2 highly promoted the photoactivity of REC/ZnO/TiO2 in removal of MB dye from aqueous solution, in which ZnO and REC played a role of photocatalyst and adsorbent. The promotion effects of TiO2 may result from the accelerated separation of electron-hole on ZnO. The observed kinetic constant for the degradation of MB over REC/ZnO and REC/ZnO/TiO2 were 0.015 and 0.038 min^（-1）, respectively. The degradation kinetics of MB dye, which followed the Langmuir–Hinshelwood model, had a reaction constant of 0.17 mg/（L min）. The decrease of removal ratio of MB after five repetitive experiments was small, indicating REC/ZnO/TiO2 has great potential as an effective and stable catalyst.As efficient water treatment agents, a novel series of rectorite-based ZnO and TiO2 hybrid composites（REC/ZnO/TiO2） were synthesized and characterized in this study. Effects of experimental parameters including TiO2 mass ratio, solution p H and catalyst dosage on the removal of methyl blue（MB） were also conducted. The presence of a little mass ratio（2%-6%） of TiO2 highly promoted the photoactivity of REC/ZnO/TiO2 in removal of MB dye from aqueous solution, in which ZnO and REC played a role of photocatalyst and adsorbent. The promotion effects of TiO2 may result from the accelerated separation of electron-hole on ZnO. The observed kinetic constant for the degradation of MB over REC/ZnO and REC/ZnO/TiO2 were 0.015 and 0.038 min^（-1）, respectively. The degradation kinetics of MB dye, which followed the Langmuir–Hinshelwood model, had a reaction constant of 0.17 mg/（L min）. The decrease of removal ratio of MB after five repetitive experiments was small, indicating REC/ZnO/TiO2 has great potential as an effective and stable catalyst.

关 键 词：TiO2 ZnO methylene blue photocatalysis rectorite 

分 类 号：O643.36[理学—物理化学] O647.33[理学—化学]