Synthesis and Characterization of Rectorite/ZnO/TiO2 Composites and Their Properties of Adsorption and Photocatalysis for the Removal of Methylene Blue Dye
来源期刊:Journal Of Wuhan University Of Technology Materials Science Edition2018年第3期
论文作者:王欢欢 周培疆 WANG Jia WANG Yifei WEI Junchong ZHAN Hongju GUO Rui ZHANG Yali
文章页码:729 - 735
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.
王欢欢1,周培疆1,WANG Jia1,WANG Yifei1,WEI Junchong2,ZHAN Hongju3,GUO Rui1,ZHANG Yali1
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 University2. School of Materials Science and Engineering, Wuhan University of Technllogy3. Jingchu University of Technology
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.
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