摘要
以熔盐法制备的微米级片状TiO_2/Bi_4Ti_3O_(12)为基体,采用Ti(SO4)2水解结合后续热处理的方法制备了TiO2/TiO_2/Bi_4Ti_3O_(12)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TiO_2/Bi_4Ti_3O_(12)表面分布着纳米级的TiO_2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 m^2·g^(-1),可见光光照4h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TiO_2/Bi_4Ti_3O_(12)的。
With micro-sized TiO2/Bi4Ti3O（12） platelet prepared by molten salt method as the substrate,the TiO2/TiO2/Bi4Ti3O（12） 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 TiO2/Bi4Ti3O（12） 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 13.444m2·g（-1）,and the methylene blue decolorization rate reached 85% under visible light irradiation in 4h.The photocatalytic degradation/decolorization rate was higher than that of pure TiO2/Bi4Ti3O（12）.
出处
《机械工程材料》
CAS
CSCD
北大核心
2016年第6期51-54,110,共5页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51202156)
