钛基二氧化铅电极对酸性红G的电催化降解

发布时间：2018-01-03 04:35

  本文关键词：钛基二氧化铅电极对酸性红G的电催化降解　出处：《环境工程学报》2016年11期 　论文类型：期刊论文

  更多相关文章： 二氧化铅 酸性红G 电催化 羟基自由基 能耗

【摘要】：采用二氧化铅电极对酸性红G溶液进行电催化降解,主要研究酸性红G的紫外-可见谱变化及其可能降解机制,考察不同因素对降解效果的影响。结果表明,酸性红G在电极表面是以间接氧化机制被羟基自由基氧化。电解过程中,偶氮键断键速率显著高于苯环及萘环,酸性红G去除率显著高于TOC去除率。电解时间延长有利于有机物去除,但会提高能耗值,且单位TOC去除能耗远高于单位酸性红G去除能耗。电流密度提高会促进酸性红G降解与TOC去除,却使单位能耗显著增加,且高电流密度会导致矿化电流效率下降。染料浓度增加使得酸性红G与TOC去除效率降低,但单位能耗随之降低,表明高有机物浓度有利于降低单位能耗值。温度升高有利于有机物降解去除。
[Abstract]:The electrocatalytic degradation of acid red G solution was carried out by using lead dioxide electrode. The UV-Vis spectrum of acid red G and its possible degradation mechanism were studied. The effects of different factors on the degradation efficiency were investigated. Acid red G was oxidized by hydroxyl radical on the electrode surface by indirect oxidation mechanism. In the electrolysis process, the bond breaking rate of azo bond was significantly higher than that of benzene ring and naphthalene ring. The removal rate of acid red G is significantly higher than that of TOC. The prolongation of electrolysis time is beneficial to the removal of organic matter, but it will increase the energy consumption. The energy consumption per unit TOC removal is much higher than that per unit acid red G. the increase of current density will promote the degradation of acid red G and the removal of TOC, but the unit energy consumption will increase significantly. The higher the current density, the lower the mineralization current efficiency. The higher the dye concentration, the lower the removal efficiency of acid red G and TOC, but the lower the unit energy consumption. The results show that high concentration of organic matter is beneficial to decrease unit energy consumption, and temperature rise is favorable to organic matter degradation and removal.
【作者单位】： 西安交通大学环境科学与工程系;西安创业水务有限公司;
【基金】：国家自然科学基金资助项目(21307098) 中国博士后科学基金资助项目(2013M532053)
【分类号】：X791
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