纳米TiO_2对甲基橙的吸附及光催化降解  

Adsorption and photocatalytic degradation of methyl orange by TiO_2 nanoparticales

作　　者：赵晓兰[1] 张鹏[1] 徐瑞芬[1] 胡伟康[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2003年第6期10-13,共4页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：北京市纳米粉体及应用技术研究项目资助(H0 10 4 10 0 70 112 )

摘　　要：采用新型氯化法制备纳米TiO2 ,研究了纳米TiO2 悬浆体系对甲基橙溶液的降解脱色情况。研究表明 ,自制纳米TiO2 对甲基橙具有良好的吸附性 ,避光暗处也能够对甲基橙得到部分降解作用。考察了避光及不同光源照射下纳米TiO2 对甲基橙的脱色情况 ,并在 16 0W汞灯照射下 ,对甲基橙溶液初始浓度、催化剂投加量、反应时间和反应温度对甲基橙溶液的降解脱色速率的影响情况进行了研究。结果表明 ,光源对甲基橙的降解脱色速率影响不大 ;纳米TiO2 投加量为 5 0～ 13 0g/L时 ,对 10 0～ 4 0 0mg/L的甲基橙溶液可达到良好的脱色效果 ;常温情况下纳米TiO2 投加量为 13g/L时 ,与 10 0mg/L的甲基橙溶液反应 30min ,在 16 0W汞灯照射下甲基橙脱色率可达91 1% ,避光暗处脱色率可达 86 9%。TiO 2 nanoparticales were prepared by a novel chlorination technology, and the decolorization of methyl orange (MO) in nano TiO 2 aqueous slurries was studied. The research indicates that the nano TiO 2 has a good adsorbability for MO, and in the dark it presents some effects on the degradation of MO. The effects of the light source, catalyst amount, initial concentration of solution, reaction time and the solution temperature on the degradation rate of methyl orange were investigated in detail. The results indicate that when the mass concentration of nano TiO 2 is between 5 0?g/L and 13 0?g/L, methyl orange (100～400?mg/L) can be degraded effectively, and the light source shows little influence on the decolorization rate at normal temperature. When the initial concentration of MO is 100?mg/L, the solution color removal achieved 91 1% in 30 minutes of irradiation,and in the dark after 30 min reaction the solution color removal achieved 86 9%.

关 键 词：光催化 纳米TIO2 甲基橙 

分 类 号：O643.32[理学—物理化学]