| 紫外光协助下DSA电极对1,4-苯醌的强化开环作用研究 |
| 摘要点击 2751 全文点击 1461 投稿时间：2008-08-12 修订日期：2008-11-21 |
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| 中文关键词 DSA电极 紫外光 1,4-苯醌 开环作用 |
| 英文关键词 DSA electrode ultraviolet 1,4-Benzoquinone aromatic ring opening |
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| 中文摘要 |
| 以商品化DSA电极为光电极，以1,4-苯醌为模型污染物进行了光电催化降解，考察了外加电解质、外加电场强度和初始pH条件等因素的影响.结果表明，光电催化氧化过程的TOC去除率是单独光催化氧化和电催化氧化过程之和的1.25倍，光电催化降解过程具有更高的降解效率，证明光催化氧化和电催化氧化过程的耦合产生了一定的协同作用.外加电解质和外加电场均能在一定浓度和强度范围内有效提高光电催化降解效率.酸性和中性pH条件利于1,4-苯醌的开环矿化.探讨了光电催化氧化机制，指出以电化学氧化作用为主导的光助电催化氧化过程能够高效产生羟基自由基，降解效率可调，在水处理中更具实用价值. |
| 英文摘要 |
| Commercial DSA electrode was employed for photoelectrochemical degradation of a model pollutant 1,4-benzoquinone. The effect of electrolyte, electrical field intensity and solution pH conditions were investigated. The results proved that the TOC removal by photoelectrochemical oxidation was 1.25 times that of photocatalytic oxidation and electrocatalytic oxidation alone, indicating a synergetic effect. Addition of electrolyte and application of external electrical field have effectively enhanced the photoelectrochemical oxidation efficiency within a certain range of concentration and intensity. Acidic and neutral pH conditions are favorable for ring opening of 1,4-Benzoquinone. The photoelectrochemical oxidation mechanism is also discussed. It suggests that the efficiency of electrochemically assisted photoelectrochemical oxidation process can be manipulated, accompanied by the generation of hydroxyl radicals, which will be more adaptable for water and wastewater treatment. |
