Ag沉积TiO_2光催化降解腐植酸研究  

Study on Photocatalytic Degradation of Humic Acid by Ag Deposited TiO_2

作　　者：陈德强[1] 张代明[1] 韦昭平[1] 

机构地区：[1]河海大学环境科学与工程学院,江苏南京210098

出　　处：《安徽农业科学》2010年第17期9379-9381,共3页Journal of Anhui Agricultural Sciences

基　　金：河海大学自然科学基金(NO.2008432411);中央高校基本科研业务费专项资金(2009B00914)

摘　　要：[目的]为饮用水中腐植酸的去除提供新思路。[方法]采用光还原法对纳米TiO2进行Ag沉积,研究改性TiO2/UV体系对腐殖酸的光降解效率,并探讨TiO2用量及腐植酸初始浓度对光降解效率的影响。[结果]适量Ag沉积可提高TiO2的光催化活性,Ag沉积量为0.8wt%时TiO2的光催化活性最大;焙烧温度为400℃时TiO2的光催化活性最强;增加TiO2用量可提高腐植酸的光降解反应速率;在试验浓度范围内,随着腐植酸初始浓度的增大,其光降解效率降低,光降解过程符合Langmuir-Hinshelwood动力学模型,反应速率常数k和Langmuir吸附常数K分别为0.173 5 mg/(L.min)和0.421 5 L/mg。[结论]适量的Ag沉积可提高TiO2光催化降解腐植酸的活性。[Objective] The study was to provide a new method for removing humic acids in drinking water.[Method] Nanometer TiO2 was deposited by Ag with photo reduction method.The photodegradation efficiency of modification TiO2/UV system on humic acid was studied and the effects of TiO2 dosage and initial concn.of humic acid on photodegradation efficiencies were explored.[Results] Ag deposition with appropriate amount could improve the photocatalytic activity of TiO2.The photocatalytic activity of TiO2 was the maximum when the deposition amount of Ag was 0.8wt%.The photocatalytic activity of TiO2 was the highest when calcination temperature was 400 ℃.The photodegradation reaction rate of humic acid could be increased by increasing TiO2 dosage.In the experimental concn.,the photodegradation efficiency of humic acid was decreased with the increase of its initial concn..The photodegradation process of humic acid corresponded Langmuir-Hinshelwood kinetics model with reaction rate constant k and Langmuir adsorption constant K of 0.173 5 mg/（L·min） and 0.421 5 L/mg resp.[Conclusion] Ag deposition with appropriate amount could improve the photocatalytic activity of TiO2 in degradation process of humic acid.

关 键 词：TIO2 Ag沉积 腐植酸 光降解 

分 类 号：X703[环境科学与工程—环境工程]