| 光电催化氧化法降解藻毒素MCLR |
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| 引用本文： | 梁志霞,梁文艳,汪丽,于建,许佳.光电催化氧化法降解藻毒素MCLR[J].环境工程学报,2012,6(11):3817-3821. |
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| 作者姓名： | 梁志霞 梁文艳 汪丽 于建 许佳 |
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| 作者单位： | 北京林业大学环境科学与工程学院,北京市水体污染控制重点实验室,北京100083 |
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| 基金项目： | 国家自然科学基金资助项目(50678024);国家"水体污染控制与治理"科技重大专项(2008ZX07314-006) |
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| 摘 要： | 使用DSA阳极,对光电催化氧化降解藻毒素MCLR的效能及其影响因素进行了研究。结果表明,电极表面的TiO2在光催化氧化降解MCLR的过程中发挥了明显的光催化作用。在光降解、电催化氧化、光催化氧化和光电催化氧化4个过程中,光电催化氧化对MCLR和TOC的去除率最高,分别可达100%和13%,并且光电催化氧化的去除率大于光催化氧化和电催化氧化之和,表明后两者的耦合过程产生了一定的协同作用。辐照光源和电流密度存在最佳匹配条件,分别为UVC辐照、电流密度10 mA/cm2和UVA辐照、电流密度1.0 mA/cm2,此条件下光电协同作用最显著。在光电催化氧化过程中,随极板间距增大而出现的去除率下降取决于电催化过程,而不是光催化过程;光电催化氧化MCLR的去除率随其初始浓度增加而减小。
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| 关 键 词： | MCLR DSA电极 光电催化氧化 |
| 修稿时间： | 9/5/2011 12:00:00 AM |
Degradation of algal toxin MCLR by photoelectrocatalytic oxidation |
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| Liang Zhixi,Liang Wenyan,Wang Li,Yu Jian and Xu Jia.Degradation of algal toxin MCLR by photoelectrocatalytic oxidation[J].Techniques and Equipment for Environmental Pollution Control,2012,6(11):3817-3821. |
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| Authors: | Liang Zhixi Liang Wenyan Wang Li Yu Jian and Xu Jia |
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| Institution: | College of Environmental Science & Engineering, Beijing Forestry University; Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing 100083,China;College of Environmental Science & Engineering, Beijing Forestry University; Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing 100083,China;College of Environmental Science & Engineering, Beijing Forestry University; Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing 100083,China;College of Environmental Science & Engineering, Beijing Forestry University; Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing 100083,China;College of Environmental Science & Engineering, Beijing Forestry University; Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing 100083,China |
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| Abstract: | The degradation of algal toxin microcystin-LR (MCLR) by photoelectrocatalytic oxidation and the influencing factors were studied. The results showed that TiO2 on the electrode surface present obvious photocatalytic effects in photocatalytic oxidation. Photoelectrocatalytic oxidation was the most effective process among photodegradation, photocataytic oxidation, electrocatalytic oxidation and photoelectrocatalytic oxidation in degrading MCLR and TOC, which achieved the removal efficiency of 100% and 13%, respectively. The degradation efficiency of photoelectrocatalytic oxidation was higher than that of the sum of photocatalytic oxidation and electrocatalytic oxidation, showing a certain synergetic effect. The best synergetic effect was obtained under optimum match condition of irradiation source and current density,which were irradiation UVC,current density of 10 mA/cm2 and irradiation UVA,current density of 1.0 mA/cm2.The removal efficiency in photoelectrocatalytic oxidation decreased along with the increase of the plate distance, which was correlative with electrocatalytic process rather than photocatalytic process. The MCLR removal efficiency decreased with the increase of its initial concentration in photoelectrocatalytic oxidation. |
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| Keywords: | microcystin-LR (MCLR) DSA electrode photoelectrocatalytic oxidation |
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