| EDTA催化Fe3+/H2O2降解水中孔雀石绿 |
| 摘要点击 1898 全文点击 1428 投稿时间：2007-06-20 修订日期：2007-08-15 |
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| 中文关键词 EDTA 催化 类芬顿体系 孔雀石绿 降解 中间价态铁 |
| 英文关键词 EDTA catalyzed Fenton-like malachite green degradation iron-oxo species |
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| 中文摘要 |
| 以孔雀石绿（malachite green,MG）为目标物，在pH=7的中性条件下，考察EDTA对Fe３＋/H2O2降解水中孔雀石绿的影响，发现EDTA很大程度地促进了Fe３＋/H2O2对孔雀石绿的降解.EDTA的加入可以使MG的脱色率由43%升至98.3%.在本实验条件下，EDTA的投加量增加5倍时，MG的脱色率上升40%.随着H2O2投量的增加，MG的脱色率显著上升.随着温度的升高，MG的脱色率显著上升.叔丁醇的加入抑制了EDTA 对Fe３＋/H2O2降解孔雀石绿的催化效果.总量相同H2O2的多次投加并未获得明显优于一次投加的去除效果.EDTA催化Fe３＋/H2O2降解水中孔雀石绿并不遵循简单的羟基自由基机理，同时存在的中间价态铁的物种起着主要的氧化作用.随着反应的进行，EDTA被部分降解. |
| 英文摘要 |
| This study found that the discolorization of malachite green solutions (0.01 mmol/L) was improved by Fe３＋/H2O2 catalyzed with EDTA, at pH 7. Oxidation was carried out in presence of various hydrogen peroxide concentrations, in a wide range of temperature and EDTA concentration. It was found that oxidation with EDTA promoted the discolorization of MG from 43% to 98.3% as compared with the cases without EDTA. The discolorization of MG increased by 40% with the increase of EDTA concentration by 5 fold. The H2O2 concentration and temperature are higher, the discolorization of MG better. t-BuOH inhibited the improvement from EDTA. With the same total dosage of applied H2O2, the multiple steps addition did not show a much higher removal efficiency than that obtained by one step. OH free radical or an iron-oxo species may be the highly reactive oxidizing species, the latter may be the major oxidant. With the time, EDTA was a little oxidized. |
