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β-环糊精修饰TiO2光催化降解橙黄Ⅱ的研究

发表时间:2014-12-31  浏览量:1567  下载量:471
全部作者: 史锦程,侍亮亮,邓琳
作者单位: 东南大学土木工程学院
摘 要: 利用TiO2和β-环糊精制备出β-环糊精修饰的TiO2(P25-S1-CD),并进行相关表征,证明β-环糊精已经固载到TiO2表面。在254 nm紫外光照下,对橙黄Ⅱ进行光催化降解反应。考察P25-S1-CD投加量、pH值和橙黄Ⅱ初始浓度对橙黄Ⅱ去除率的影响,并分析原因。最后对橙黄Ⅱ进行光解动力学研究和光降解原因的探讨。实验结果表明:P25-S1-CD相比于未改性的TiO2(P25)对橙黄Ⅱ有更好的光催化降解效率,其光催化去除率随P25-S1-CD 投加量的增加、pH值的增加而增大,随橙黄Ⅱ初始浓度的增加而降低。当橙黄Ⅱ初始浓度在10~50 μmol/L时,P25-S1-CD光催化橙黄Ⅱ的去除效率曲线符合准一级反应动力学。
关 键 词: 环境化学;β-环糊精;TiO2;橙黄Ⅱ;光降解
Title: Study on photodegradation of orange Ⅱ by TiO2 synthesized β-cyclodextrin
Author: SHI Jincheng, SHI Liangliang, DENG Lin
Organization: School of Civil Engineering, Southeast University
Abstract: β-cyclodextrin and TiO2 were taken as raw materials and synthesized TiO2 modified by β-cyclodextrin (P25-S1-CD). The modified nanoparticles were characterized, which proved that the β-cyclodextrin modified TiO2 composites nanoparticle had been successfully synthesized through cross-linking. The degradation rate of orange II by P25-S1-CD was tested under 254 nm ultraviolet light. The enhancement effect was influenced by the dosage of P25-S1-CD, initial pH value and initial orange II concentration. The photolysis kinetics and photodegradation reason were also discussed. The results showed that P25-S1-CD had higher photocatalytic degradation removal efficiency than unmodified TiO2(P25) in photocatalytic degrading orange II. The increase of P25-S1-CD dosage and pH value could lead to the higher degradation removal efficiency of orange II. The increase of initial orange II concentration could lead to the lower photodegradation removal efficiency of orange II. When the initial concentration of orange II was within 10-50 μmol/L, the photodegradation removal rate of orange II fitted the pseudo first order reaction kinetics.
Key words: environmental chemistry; β-cyclodextrins; TiO2; orange II; photocatalytic degradation
发表期数: 2014年12月第24期
引用格式: 史锦程,侍亮亮,邓琳. β-环糊精修饰TiO2光催化降解橙黄Ⅱ的研究[J]. 中国科技论文在线精品论文,2014,7(24):2434-2440.
 
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