β-环糊精修饰二氧化钛光催化降解橙黄II的研究
首发时间:2013-12-16
摘要:利用二氧化钛和β-环糊精制作P25-S1-CD,在254nm紫外光照下,对橙黄Ⅱ进行了光催化降解反应。考察P25-S1-CD投加量,pH值和橙黄Ⅱ初始浓度对于橙黄Ⅱ去除率的影响,并分析了原因,最后还对橙黄Ⅱ进行了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相比于未改性的二氧化钛对橙黄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10~50μmol/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。
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Study on photodegradation of orange Ⅱ by titanium dioxide synthesized β-cyclodextrin
Abstract:β-cyclodextrin and TiO2 were taken as raw materials, then synthesized into titanium dioxide modified by β-cyclodextrin (P25-S1-CD). Compared with P25,the degradation rate of orange II by P25-S1-CD was tested under 254nm UV light. The enhancement effect was influenced by the dosage of P25-S1-CD, initial pH, 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 P25 in photocatalytic degrading orange II. The increase of P25-S1-CD dosage and pH 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 10~50μmol/L, the photodegradation removal rate of orange II fitted the first order reaction kinetics.
Keywords: β-cyclodextrins TiO2 orange II photocatalytic degradation
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β-环糊精修饰二氧化钛光催化降解橙黄II的研究
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