基于Ti/SnO2阳极氧化法的典型染料废水电化学氧化规律

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。

Electrochemical oxidation rule of representative dye wastewater with Ti/SnO2 as anode

Ti/SnO2 was employed as anode to electrolyze simulated dye wastewater containing Direct Dark Brown M （DDB-M） and Reactive Brilliant Blue KNR （RBB-KNR） by the method of indirect anode oxidation. The influences of the type of electrolytes, pH value, voltage, NaC1 dosage, and electrolysis time on the degrada- tion performance were explored. Under the optimal condition, degradation rule of the two dyes was analyzed by investigating the existance form of nitrogen and UV-Vis spectra. After being electrolyzed for 30 min （at the pH value of 3, the voltage of 20 V, the concentration of NaC1 2.5 g/L）, the decolourization of DDB-M and RBB- KNR reached 80% and 95% , respectively; 60 min later, the COD removal of DDB-M and RBB-KNR achieved 75% and 90% , respectively. The azo double bond of DDB-M was completely broken, the benzene ring and naphthalene ring were gradually broken during electrolytic oxidation process. As the electrolysis process contin- ued, the anthraquinone conjugated structure of RBB-KNR began to be gradually broken at 2 min, and then the dye was degraded step by step.