β-环糊精强化紫外光降解2，2-双(4-羟基-3-甲基苯)丙烷

β-Cyclodextrin Enhanced Photodegradation of 2,2-Bis(4-hydroxy-3-methylphenyl)propane by UV Irradiation

用稳态荧光光谱法研究了2,2-双(4-羟基-3-甲基苯)丙烷(双酚C)与β-环糊精形成1:1稳定的包结物,其生成常数为4.94×103L/mol;研究了β-环糊精存在下双酚C的紫外光(λmax=254nm)降解行为,结果表明,β-环糊精可促进水溶液中双酚C的紫外光降解,光降解反应符合假一级反应动力学规律。10mg/L双酚C经60min紫外光照射,β-环糊精可使双酚C的紫外光降解效率从36%提高至86%,在pH值2～8范围内,pH值对双酚C的光降解没有明显的影响;当pH>8时,双酚C的光降解反应明显加快,随着β-CD浓度的增加双酚C的光降解反应速率也逐渐增加,当β-CD的浓度超过8.0×10-5mol/L时,双酚C的光降解反应速率不再明显增加。β-环糊精对双酚C的包结作用引起双酚C分子键能的削弱,导致双酚C光降解作用的增强。

Inclusion complex of 2,2-bis （ 4-hydroxy-3-methylphenyl ） propane （ BPC ） with β-cyclodextrin （β- CD） was studied by using steady-state fluorescence spectroscopy. A 1：1 inclusion complex can be concluded with the formation constant of 4. 94 × 10^3 L/mol. The photodegradation behavior of BPC in aqueous solutions with β-CD was investigated under UV irradiation（λmax = 254 nm）. The results show that β-CD can enhance the photodegradation of bisphenol C in aqueous solution. The photodegradation of BPC in aqueous solution was found to follow pseudo-first order kinetics law. After 60 min of UV irradiation, β-CD could increase the photodegradation efficiency from 36% to 86% for 10 mg/L BPC. There was no obvious variation for the photodegradation rate of BPC in a pH range from 2 to 8. However, there was obvious increase above pH 8. The photodegradation rate of BPC increased with increasing concentration of β-CD, and there was no further increase in the photodegradation rate when concentration of β-CD exceeded 8.0 × 10^-5 mol/L. The enhancement of photodegradation of BPC is mainly resulted from the lower bonding energy between some atoms in the BPC molecule after inclusion interaction with β-CD.