TiO_2/AC光催化剂对卡马西平的降解特性  

Photocatalytic Degradation Characteristics of Carbamazepine over Activated Carbon Supported TiO_2

作　　者：陈卫[1] 赵磊[1] 许航[1] 杨金虎[1] 

机构地区：[1]河海大学环境学院,南京210098

出　　处：《土木建筑与环境工程》2012年第5期126-131,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：江苏省环境科学与工程重点实验室开放课题(zd101203)

摘　　要：以椰壳粉末活性炭(PAC)为载体,钛酸丁酯和乙醇为原料,采用溶胶凝胶浸渍法制备负载型光催化剂(TiO2/AC),并研究其降解模拟废水中微量污染物卡马西平的效果。结果表明:TiO2/AC对卡马西平的处理效果明显优于粉末二氧化钛(TiO2)和活性炭,TiO2/AC对卡马西平的去除率是TiO2的1.7倍。当卡马西平初始浓度为10mg/L时,TiO2/AC的投加量为500mg/L、TiO2的负载量为11.2%、反应pH值为7时,卡马西平去除率达到90.6%。TiO2/AC对不同初始浓度卡马西平溶液的降解过程符合准二级反应动力学,二级反应常数与浓度成反比。利用Langmuir-Hinshelwood(L-H)模型可得出表观吸附平衡常数Ka=9.215×103 L/mol,表面反应速率常数Kr=3.678×10-6 mol/(L·min),微波辐照是实现催化剂再生的最佳方法。Taking a coconut shell powder activated carbon（PAC） as the carrier and butyl acetate titanate with ethanol as raw materials,TiO2/AC（activated carbon） photocatalyst was prepared through sol-gel and impregnation method,and batch experiments were carried out to investigate its performances of removing Carbamazepine from artificial water.The results indicate that TiO2/AC has a better removal of carbamazepine than powder TiO2 and PAC.In the same condition,the removal of carbamazepine in TiO2/AC system is 1.7 times than that in TiO2.When the initial concentration of Carbamazepine is 10 mg/L,and the dosage of TiO2/AC is 500 mg/L,in which the load capacity of TiO2 is 11.2%,the removal rate reaches at 91.5% while the PH is 1.0.The reaction of photocatalytic degradation process can be accorded with two-step dynamics kinetics with different concentrations.The constant of secondary reaction is inversely proportional to concentration.Using Langmuir-Hinshelwood（L-H） model,it concludes that the apparent adsorption equilibrium constant Ka is 9.215×10^3 L/mol,and the surface reaction rate constant Kr is 3.678×10^-6 mol/（L·min）.Thus,microwave irradiation is the best way for catalyst regeneration.

关 键 词：负载型TIO2 光催化 卡马西平 活性炭 

分 类 号：X703.1[环境科学与工程—环境工程]