首先在氟掺杂的氧化锡导电玻璃(FTO)上水热生长一层TiO2纳米棒阵列薄膜,然后通过旋涂法旋涂ZnO籽晶层后水热法生长ZnO纳米棒得到TiO2/ZnO纳米棒阵列薄膜。通过XRD、SEM、PL、UV-Vis和电化学工作站等对单层TiO2纳米棒和TiO2/ZnO纳米棒的...首先在氟掺杂的氧化锡导电玻璃(FTO)上水热生长一层TiO2纳米棒阵列薄膜,然后通过旋涂法旋涂ZnO籽晶层后水热法生长ZnO纳米棒得到TiO2/ZnO纳米棒阵列薄膜。通过XRD、SEM、PL、UV-Vis和电化学工作站等对单层TiO2纳米棒和TiO2/ZnO纳米棒的结构、表面形貌、荧光性能、光吸收强度以及光电化学性质进行表征。结果表明,随着水热生长ZnO时间的增长,ZnO纳米棒密度增加;ZnO纳米棒的生长时间不同使其荧光强度不同,TiO2/Zn O纳米棒的荧光强度与单层TiO2纳米棒相比有着微小的减弱,没有明显的衍射峰;TiO2/ZnO纳米棒复合材料比单层TiO2的光吸收强度高,提高其光学性能,但是吸光区域都在紫外光区域;在标准模拟太阳光照射下,TiO2/Zn O纳米棒的光电流为0. 002 m A,单层TiO2纳米棒的光电流为0. 006 m A,复合薄膜的电流有着明显的变化。展开更多
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
文摘首先在氟掺杂的氧化锡导电玻璃(FTO)上水热生长一层TiO2纳米棒阵列薄膜,然后通过旋涂法旋涂ZnO籽晶层后水热法生长ZnO纳米棒得到TiO2/ZnO纳米棒阵列薄膜。通过XRD、SEM、PL、UV-Vis和电化学工作站等对单层TiO2纳米棒和TiO2/ZnO纳米棒的结构、表面形貌、荧光性能、光吸收强度以及光电化学性质进行表征。结果表明,随着水热生长ZnO时间的增长,ZnO纳米棒密度增加;ZnO纳米棒的生长时间不同使其荧光强度不同,TiO2/Zn O纳米棒的荧光强度与单层TiO2纳米棒相比有着微小的减弱,没有明显的衍射峰;TiO2/ZnO纳米棒复合材料比单层TiO2的光吸收强度高,提高其光学性能,但是吸光区域都在紫外光区域;在标准模拟太阳光照射下,TiO2/Zn O纳米棒的光电流为0. 002 m A,单层TiO2纳米棒的光电流为0. 006 m A,复合薄膜的电流有着明显的变化。
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.
