摘要
以钛酸四丁酯为钛源,硫脲为掺硫前驱物,采用聚乙二醇辛基苯基醚(Triton X-100)/正己醇/环己烷/氨水的微乳液体系合成了掺硫的纳米TiO2粉体;对其结构进行了表征,以甲基橙为目标降解物考察了其光催化性能。烧结温度通过影响TiO2的晶型转变和颗粒尺寸来影响其光催化性能,随着烧结温度的升高,TiO2的光催化性能先是提高,然后迅速降低;在600℃烧结2 h时催化剂的降解性能达到最佳。掺杂硫可提高TiO2的光催化活性,随着掺杂量的增加,催化剂对甲基橙的降解率先快速增加然后缓慢降低,当掺杂量为S/Ti(摩尔比)=0.01∶1时TiO2的光催化降解效果最好。催化剂在用量较小时迅速提高TiO2的光催化降解性能,而后随着用量的增大反而降低,当催化剂用量为1.5 g/L时,对甲基橙的降解效果最好。
Sulfur-doped TiO2（S-TiO2） nanoparticles were synthesized by microemulsion method,using tetrabutyl titanate（Ti（OBu）4） and sulfourea as precursors and water-in-oil（W/O） microemulsions system of Triton X-100,n-hexanol,cyclohexane and ammonia water.The structure of the synthesized TiO2 nanoparticles was characterized.In addition,the photocatalytic property of the nanoparticles under UV-light irradiation was investigated by degradation of methyl orange solution.The results show that the calcination temperature affects greatly the photocatalytic degradation through its influence on the crystallite transformation and particle size of TiO2.The degradation rate increases rapidly with the increase of the calcination temperature,but decrease dramatically when the calcination temperature is too high.When the calcination temperature is 600 ℃ and the calcination time is 2 h,the degradation rate reaches the maximum value.In addition,the doping amount of S can improve the degradation obviously when the S amount is relatively low.The degradation rate decreases slowly when the S amount is too high,and the largest degradation rate can be obtained at a molar ratio of S/Ti=1%.The degradation rate can be dramatically enhanced with the increase of catalyst load but decreases with the further increase of catalyst load.The optimum catalyst load is 1.5 g/L.
出处
《环境工程学报》
CAS
CSCD
北大核心
2011年第5期1003-1007,共5页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(50862001)
教育部留学回国基金资助项目
关键词
纳米二氧化钛
掺硫
微乳法
光催化
甲基橙
TiO2 nanoparticles
sulfur doping
microemulsion method
photocatalysis
methyl orange
