β-环糊精修饰二氧化钛光催化降解甲基橙
首发时间:2012-11-01
摘要:以β环糊精和二氧化钛等为原料,制备出经β环糊精修饰的二氧化钛:P25-S1-CD。将P25-S1-CD与未经β环糊精修饰的P25对比,考察其在254nm紫外光下对甲基橙光降解的效果以及P25-S1-CD投加量、初始pH、甲基橙初始浓度及温度对甲基橙光降解的影响。还对体系进行了光解动力学研究和光降解原因的探讨。结果表明,与未改性的P25相比,P25-S1-CD可有效提高甲基橙溶液的光催化降解率。在甲基橙初始浓度为10~50umol/L范围内,对甲基橙的降解按照Langmuir-Hinshelwood动力学模式进行拟合,表明在P25-S1-CD体系的光催化降解表现为一级反应。通过考察添加叔丁醇对P25-S1-CD光降解甲基橙的影响,表明oOH在甲基橙光降解中起到重要的作用。
For information in English, please click here
Degradation of methyl orange in aqueous solutions in the presence of titanium dioxide modified by β-cyclodextrin
Abstract:In this paper,β-cyclodextrin and TiO2 were taken as raw materials, were then synthesized into titanium dioxide modified by β-cyclodextrin (P25-S1-CD). Compared with P25, the degradation rate of methyl orange by P25-S1-CD under the 254nm UV light was tested. Dosage of P25-S1-CD, initial pH, initial concentraion of methyl orange and temperature were investigated under the irradiation of 254nm UV light. The photolysis kinetics and photodegradation reason were also discussed. The results showed that compared with P25, P25-S1-CD could effectively improve the photocatalytic degradation rate of methyl orange solution. When methyl orange's initial concentration was within 10~50umol/L, degradation of methyl orange were fitted by the Langmuir-Hinshelwood kinetics model, it turned out that the photocatalytic degradation of P25-S1-CD system fitted the first order reaction. Through the research of adding t-BuOH into P25-S1-CD system, it showed oOH played an important role in the process of methyl orange's degradation.
Keywords: β-cyclodextrin Modified TiO2 Photocatalytic Methyl Orangekey
论文图表:
引用
No.****
同行评议
共计0人参与
勘误表
β-环糊精修饰二氧化钛光催化降解甲基橙
评论
全部评论0/1000