纳米TiO2对甲基橙的吸附及光催化降解

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 160W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100～400mg/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100mg/L的甲基橙溶液反应30min，在160W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%。

Adsorption and photocatalytic degradation of methyl orange by TiO2 nanoparticales

TiO₂ nanoparticales were prepared by a novel chlorination technology, and the decolorization of methyl orange (MO) in nano-TiO₂ aqueous slurries was studied. The research indicates that the nano-TiO₂ 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-TiO₂ is between 5.0g/ L, and 13.0g/ 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%.