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基于Ti/SnO2阳极氧化法的典型染料废水电化学氧化规律

Keywords: 模拟废水,染料,间接阳极氧化,脱色,降解规律

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Abstract:

采用Ti/SnO2电极间接阳极氧化法处理直接深棕M和活性艳蓝KNR模拟染料废水,研究电解质种类、pH、电压、NaCl投加量及电解时间对其降解效果的影响;在最佳组合条件下,通过分析UV-Vis光谱以及降解过程中氮元素的存在形式,研究上述2种染料的降解规律。结果表明,在pH为3,电压20V,NaCl投加量为2.5g/L的条件下,电解30min后,直接深棕M和活性艳蓝KNR的脱色率分别达到80%和95%,60min后直接深棕M的COD去除率可达75%,活性艳蓝KNR的COD去除率达到90%;电解60min后,直接深棕M的偶氮双键完全破坏,萘环和苯环结构被逐步降解,活性艳蓝KNR溶液电解2min,其分子结构中的蒽醌共轭体系被破坏,随反应的进行,蒽醌结构逐渐被破坏,染料逐步降解。

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