摘要
研究了对羟基苯甲酸存在下TiO2光催化还原Cr(Ⅵ)过程中不同对羟基苯甲酸浓度、Cr(Ⅵ)初始浓度及溶液初始pH值对Cr(Ⅵ)光降解速率的影响,认为TiO2悬浮体系能有效地光催化还原水溶液中的Cr(Ⅵ)离子,并得出TiO2光催化还原Cr(Ⅵ)过程符合L H动力学模型。反应体系中的Cr(Ⅵ)初始浓度及初始pH值对TiO2光催化还原Cr(Ⅵ)过程的速率有较大的影响。酸性条件有利于Cr(Ⅵ)的光催化还原。对羟基苯甲酸具有芳香族化合物的特殊结构,对TiO2光催化还原Cr(Ⅵ)过程有显著的促进作用。
The effects of different initial Cr(Ⅵ)concentration, varies solution pH values and p-hydroxybenzoic acid concentration on photoreduction rate of Cr(Ⅵ) in TiO_2 dispersion were investigated. The results indicate that Cr(Ⅵ) can be reduced remarkably with TiO_2 dispersion. Photocatalytic reduction of Cr(Ⅵ) in TiO_2 dispersion is in accorcl with L-H kinetic equation. Initial Cr(Ⅵ) concentration and solution pH values exhibit rather great effects on photoreduction rate of Cr(Ⅵ). The acidic solutions were favorable for photoreduction of Cr(Ⅵ). The p-hydroxybenzoic acid assumes special construction of aromatic compounds, and exhibits promotion effect on Cr(Ⅵ) reduction.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2005年第3期261-264,共4页
Chinese Journal of Rare Metals
基金
国家自然科学基金资助项目(20304019)
