| 环糊精对Fe(Ⅲ)引发双酚A光降解的影响 |
| 摘要点击 2274 全文点击 1551 投稿时间：2007-04-01 修订日期：2007-06-28 |
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| 中文关键词 双酚A 环糊精 Fe(Ⅲ)-OH配合物 光降解 PM3 |
| 英文关键词 bisphenol A (BPA) cyclodextrin Fe (Ⅲ)-hydroxyl complexes photodegradation PM3 |
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| 中文摘要 |
| 环糊精α-CD、β-CD和γ-CD能分别与双酚A形成1∶1主-客体包结物.在250W金属卤化物灯(λ≥365 nm)光照下，研究了在Fe(Ⅲ)-OH配合物体系中，不同环糊精对双酚A光降解的影响.结果表明，β-CD能较大地促进双酚A的光降解，α-CD次之，而γ-CD对双酚A的光降解存在一定的抑制；并且CDs浓度的变化对双酚A光降解的初始速率有明显的影响.双酚A光降解的初始速率随着β-CD和α-CD浓度增大而增加，当β-CD=60 μmol/Ｌ时达到最大，然后随着浓度增大而降低，而BPA的光降解初始速率随γ-CD浓度的增加总的趋势是减小的.通过计算机软件Gaussian98，采用PM3方法模拟了环糊精与双酚A的包结行为，进一步说明3种环糊精与双酚A形成主-客体包结物对光降解的影响. |
| 英文摘要 |
| Cyclodextrins (CDs) can form a host/guest inclusion complex with bisphenol A(BPA). Under a 250 W metal halide lamp (λ≥ 365 nm), the effects of different cyclodextrins to oxidation of endocrine disrupter BPA in the Fe(Ⅲ)-hydroxyl complexes system were investigated. In the presence of α-cyclodextrin or β-cyclodextrin (α-CD or β-CD), the photodegradation efficiency of BPA can be enhanced, but γ-cyclodextrin (γ-CD) showed inhibitive effect on the photodegradation efficiency. The initial degradation rate of BPA firstly increased with increasing concentration of β-CD and α-CD from 0 to 60 μmol·L-1, and the maximum rate was reached at the β-CD concentration of 60 μmol·L-1, and then decreased. But the initial degradation rate of BPA decreased with increasing concentration of γ-CD. Furthermore, the structures of BPA, CDs and BPA/CDs were optimized used the PM3 method in Gaussian98 software package. The results showed that BPA partly entered the cavity of CDs, which formed different super-molecular host-guest complexes, and resulted in the different photodegradation rates of BPA under UV-vis irradiation. |
