| δ-MnO2/水界面17β-雌二醇的氧化转化 |
| 摘要点击 2231 全文点击 1839 投稿时间：2008-08-26 修订日期：2008-09-16 |
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| 中文关键词 17β-雌二醇 二氧化锰 氧化转化 转化途径 |
| 英文关键词 17β-estradiol manganese dioxide oxidative transformation transformation pathway |
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| 中文摘要 |
| 采用化学合成的新生态水合δ-MnO2为氧化剂，研究其对17β-雌二醇（E2）氧化转化的反应动力学，考察相关因素（如pH、δ-MnO2投加量等）对氧化转化的影响，并通过气相色谱质谱联用仪（GC/MS）分析δ-MnO2氧化转化E2的产物，探讨氧化转化的反应机制.结果表明，E2对新生态水合δ-MnO2的氧化作用具有较强的反应感受性，且在pH值一定和δ-MnO2充分过量的条件下，E2氧化转化的反应动力学并不是简单的准一级反应动力学，而是遵循复合的反应动力学.E2的氧化转化速率与δ-MnO2的投加量呈正相关，在δ-MnO2投加量为c(E2)∶c(MnO2)=1∶100时，反应体系中的δ-MnO2已足够，E2浓度在8h内降低了90%以上.E2的氧化转化速率与pH值的增加呈负相关，pH为4.0时，E2在0.25h内去除率达到95%，而在pH为6.8和9.0时，E2在1h内只去除了80%和75%.另外，在反应过程中检测到了2个主要产物，分别为雌酮（E1）和2-羟雌二醇，并在此基础上结合相关文献提出了氧化转化流程. |
| 英文摘要 |
| The oxidative transformation of 17β-estradiol (E2) by the δ-MnO2 was investigated in batch experiments, and the influence of pH and δ-MnO2 dosage on the reaction process was studied. The results suggested that E2 could be degraded by δ-MnO2, and the oxidation reaction deviated from the pseudo-first-order kinetics at a constant pH and with an enough excess of δ-MnO2. δ-MnO2 dosage had a positive effect on oxidative transformation of E2. When c(E2)∶c(MnO2)=1∶100, the δ-MnO2 dosage was enough for E2 degradation, and the removal rate of E2 was above 90% after 8h reaction. The pH value had a negative effect on E2 degradation. When at pH 4.0, E2 concentration was decreased sharply and removal rate reached 95% after 0.25 h reaction, while E2 was disappeared by 80% at pH 6.8 and by 75% at pH 9.0 even after 1 h reaction. Two products, estrone (E1) and 2-hydroxyestradiol, were detected by gas chromatography coupled with mass spectrometry (GC-MS), and the probable transformation pathway was proposed. |
