掺铜TiO_2薄膜光催化降解碱性品红的研究  

Cu-doping TiO_2 thin film and its photocatalytic degradation of alkaline fuchsin

作　　者：齐帅[1] 刘义新[1] 孟丽华[1] 王阿楠[1] 

机构地区：[1]中国科学技术大学地球和空间科学系,安徽合肥230026

出　　处：《工业水处理》2009年第5期50-53,共4页Industrial Water Treatment

摘　　要：采用溶胶-凝胶法在硅胶载体颗粒的表面制得Cu掺杂TiO2薄膜,通过扫描电镜(SEM)观察了TiO2纳米颗粒在载体表面的负载情况,显示二氧化钛纳米颗粒在载体表面是均匀分布的。研究了在自然光照条件下,碱性品红在TiO2薄膜上的光催化降解与溶液初始浓度、催化剂用量之间的关系,并比较了掺铜和未掺铜催化剂光催化的效率。结果表明,随着光催化剂投加量的增加,光降解效率增大,但当光催化剂投加量达到一定程度,继续增加其用量,光降解效率增加不多;随着初始浓度的增加,光催化效率在降低。考虑到经济性和光催化效率,选取催化剂的投加量为30.0g/L、品红溶液初始质量浓度为10mg/L时,5d光催化降解率为83.61%。掺铜的TiO2薄膜比不掺铜的TiO2薄膜光催化活性高。催化剂重复使用3次的实验结果表明,其具有很好的稳定性。The evenly distributed Cu-doping TiO2 thin films deposited on carrier silicagel have been prepared by sol-gel processing. The loading conditions of TiO2 nano particles on carrier are observed on scanning electron microscope（SEM）. The results show that TiO2 nano particles are homogenized on carrier. Under natural the relationship of photocatalytic degradatio of the solution and the dosage of catalyst sunlight, n of alkaline fuchsin on TiO2 thin films with the initial concentration is studied. The efficiency of photocatalysis of Cu-doping catalyst is compared with non-Cu-doping catalyst. The resuhs show that the efficiency of photocatalytic degradation increases with the increase of catalyst dosage, but when catalyst dosage reaches a certain amount, the efficiency of photocatalytic degradation increases less. The efficiency of photocatalytic degradation reduces with the increase of initial alkaline fuchsin concentration. Considering degradation, when the catalyst dosage is 30.0 g/L and economic efficiency and efficiency of photocatalytic initial alkaline fuchsin concentration is 10 mg/L, the rate of photocatalytic degradation reaches 83.61% in 5 d. The Cu-doping TiO2 film has higher photocatalytic activity than non-Cu-doping TiO2 film. After using the catalyst three times, its stability is assured.

关 键 词：碱性品红 溶胶-凝胶法 Cu掺杂TiO2薄膜 光催化 

分 类 号：X703.1[环境科学与工程—环境工程]