Preparation and Characterization of Visible-light Irradiated TiO2/Bi4Ti3O12 Composite Powder
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摘要: 以熔盐法制备的微米级片状Bi4Ti3O12为基体, 采用Ti(SO4)2水解结合后续热处理的方法制备了TiO2/Bi4Ti3O12复合粉, 研究了原料配比对复合粉晶体结构、形貌以及光催化降解脱色效果的影响。结果表明:该复合粉的形貌为微米级片状Bi4Ti3O12表面分布着纳米级的TiO2颗粒; 当原料中铋、钛物质的量比低于1∶6时, 复合粉对亚甲基蓝具有良好的吸附脱色效果, 钛含量过多时会导致水解产物的团聚, 降低复合粉的比表面积, 使其脱色效果变差; 当铋、钛物质的量比为1∶4时, 复合粉的比表面积为13.444 m2·g-1, 可见光光照4 h以内, 对亚甲基蓝的脱色率达到85%, 其光催化降解脱色速率高于Bi4Ti3O12的。
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关键词:
- TiO2/Bi4Ti3O12复合粉 /
- 水解 /
- 可见光 /
- 脱色率
Abstract: With micro-sized Bi4Ti3O12 platelet prepared by molten salt method as the substrate, the TiO2/ Bi4Ti3O12 composite powders were prepared by the hydrolysis of titanium sulfate followed by heat treatment. The effects of raw material ratios on the crystal structure, morphology and photocatalytic degradation/decolorization performance of the composite powders were investigated. The results show that the composite powders showed the morphology of nano-scale TiO2 particles distributing on the surface of micro-scale Bi4Ti3O12 platelets. When the molar ratio of Bi/Ti in raw materials was lower than 1∶6, the adsorption decolorization effect of the composite powder on methylene blue was good. But a relatively high content of Ti could result in the agglomeration of the hydrolysis product and lowered the surface area of the composite powder, leading to the poor decolorization effect. When the molar ratio of Bi/Ti was equal to 1∶4, the BET surface area of the composite powder reached 13.444 m2·g-1, and the methylene blue decolorization rate reached 85% under visible light irradiation in 4 h. The photocatalytic degradation/decolorization rate was higher than that of pure Bi4Ti3O12.-
Keywords:
- TiO2/Bi4Ti3O12 composite powder /
- hydrolysis /
- visible light /
- decolorization rate
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