Photoassisted electrochemical degradation of organic pollutants on a DSA type oxide electrode: process test for a phenol synthetic solution and its application for the E1 bleach Kraft mill effluent.
Photoassisted electrochemical degradation of organic pollutants on a DSA type oxide electrode: process test for a phenol synthetic solution and its application for the E1 bleach Kraft mill effluent.
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DOI：
10.1021/es001784j
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发表时间：
2001-07
影响因子：
11.4
通讯作者：
R. Pelegrini;Renato S. Freire;Nelson Durán;R. Bertazzoli
中科院分区：
文献类型：
--
作者：
R. Pelegrini;Renato S. Freire;Nelson Durán;R. Bertazzoli
在本文中，研究了光辅助电解过程降解有机污染物的性能。这项工作获得的结果表明，热制备的涂有 70TiO2/30RuO2 的钛阳极表现出光活性，可用于废水处理。对合成苯酚水溶液和真实的造纸工业废水进行了处理。动力学分析表明，电解和光催化具有协同效应，降解率比单独使用这两种过程所达到的结果总和大一个数量级。使用 125 W 汞灯和 20 mA cm-2，苯酚浓度在 90 分钟内衰减了 85%，TOC 降低了 70%。在E1漂白牛皮纸厂废水降解处理工艺的应用中，总酚在短时间内几乎被消除，并且通常耐生物处理的颜色从吸光度测量的初始值降低到10%。 AOX、COD 和 BOD 分别减少了 25%、30% 和 35%。
In this paper, the performance of a photoassisted electrolysis process, for the degradation of organic pollutants, is investigated. Results obtained in this work have shown that the thermally prepared anode of titanium, coated with 70TiO2/30RuO2, exhibits photoactivity and may be used for the treatment of effluents. A synthetic phenol aqueous solution and a real paper mill industry effluent were treated. Kinetic analysis showed a synergetic effect of electrolysis and photocatalysis and degradation rates are an order of magnitude greater than the sum of the results reached by using both processes individually. Using a 125 W mercury bulb and 20 mA cm-2, the phenol concentration decayed 85% in 90 min and 70% reduction of TOC was obtained. In the application of the treatment process for the degradation of the E1 bleach Kraft mill effluent, total phenols were practically eliminated in a short period of processing time, and color, usually resistant to biological treatment, was reduced to 10% from its initial value measured in terms of absorbance. Reductions of AOX, COD, and BOD by 25%, 30%, and 35%, respectively, were also observed.