铂修饰TiO_2柱撑膨润土光催化还原含Cr(Ⅵ)废水的研究  

Photocatalytic reduction of wastewater containing Cr(Ⅵ) by photocatalyst Pt modified TiO_2 pillared bentonite

作　　者：余晓鹏[1] 张付宝[1] 

机构地区：[1]四川理工学院材料与化学工程系,四川自贡643000

出　　处：《应用化工》2009年第3期398-401,共4页Applied Chemical Industry

摘　　要：采用光沉积法制备了铂修饰TiO2柱撑膨润土光催化剂,并将其应用于含Cr(Ⅵ)废水降解还原的光催化反应。研究了废水的pH值、Cr(Ⅵ)的初始浓度、有机物等因素对含铬废水中Cr(Ⅵ)的去除率的影响。结果表明,Pt-TiO2-bentonite用量为6 g/L,废水初始pH为3.0,初始浓度为0.48 mmol/L的Cr(Ⅵ)离子,经12 W紫外灯照射反应75 min,即能达到国家排放标准,Cr(Ⅵ)的光催化还原符合L-H动力学规律,并且该复合光催化剂具有良好的沉降性能和较好的重复使用性能。The Pt modified TiO2 pillared catalyst prepared through photodeposition method was applied to the photocatalytic reduction of Cr （ Ⅵ ） containing in wastewater. The effects of pH value, various initial concentrations of Cr（Ⅵ） ,organic chemicals on the removal rate of Cr（Ⅵ） have been investigated. The result indicated that the dosage of Pt modified TiO2 pillared bentonite is 6 g/L, the pH value is 3.0, Cr（ VI ） with 0.48 mmol/L initial concentration, using the irradiation of 12 W ultraviolet lamp for 75 min, Cr（ Ⅵ） in wastewater can reach the national discharge standard. The photocatalytic reduction of Cr（ Ⅵ ） follows L-H kinetic equation. The composite catalyst has good sedimentation ability and preferable reuse performance.

关 键 词：Cr(Ⅵ) TiO2柱撑膨润土 光催化 

分 类 号：O643.3[理学—物理化学]