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...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.展开更多
用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密...用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密的氧化铝膜,产物经充分分散后在有机介质中或水中的稳定时间分别由改性前的2 m in和5 m in提高到2 h和1 d,紫外线透过率由改性前的大于8.5%降低到小于7%。展开更多
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)+2 种基金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)
文摘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.
文摘用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密的氧化铝膜,产物经充分分散后在有机介质中或水中的稳定时间分别由改性前的2 m in和5 m in提高到2 h和1 d,紫外线透过率由改性前的大于8.5%降低到小于7%。
