β-Cyclodextrin-enhanced photodegradation of bis(4-hydroxyphenyl)ethane under UV irradiation

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• 作者：Guanghui Wang ; Xiaofei Xue ; Haifeng Li ; Feng Wu ; Nansheng Deng
• 关键词：Bis(4-hydroxyphenyl)ethane ; β ; -CD ; Photodegradation ; Enhancement ; UV irradiation
• 刊名：Journal of Molecular Catalysis A ; Chemical
• 出版年：2007
• 期刊代码：57_13811169
• 类别：ch
• 出版时间：17 October 2007
• 卷：276
• 期：1-2
• 页码：143-149
• 文件大小：701 K

摘要

β-Cyclodextrin (β-CD) reacts with bis(4-hydroxyphenyl)ethane (BPE) forming a 1:1 inclusion complex, the formation constant of which is 7.81 × 10³ l mol⁻¹. In the present study, the enhanced photodegradation behavior of BPE in the presence of β-CD was investigated under a 30 W UV lamp (λ_max = 254 nm). As a result, the photodegradation rate constant of BPE in aqueous solution with β-CD showed a 5.37-fold increase. After 60 min UV irradiation, addition of β-CD increased the photodegradation efficiency of 10.0 mg l⁻¹ BPE by about 54.4%, simultaneously enhancing the mineralization of BPE. The effect of β-CD concentration, the presence/absence of organic solvent and pH on the photodegradation of BPE were also studied. The predominant photodegradation products were p-hydroxybenzoic acid, m-hydroxylated BPE and o-hydroxylated BPE. The enhancement of photodegradation of BPE was mainly shown to be the result of an increase in the frontier electron density of BPE after inclusion of β-CD and the moderate inclusion depth of BPE molecules in the β-CD cavity.