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采用UV活化过硫酸钾的方式产生具有强氧化性的硫酸根自由基,以罗丹明为目标污染物,考察了硫酸根自由基对罗丹明B的氧化降解行为。研究了K2S2O8浓度、罗丹明B初始浓度、光照时间、溶液p H值和不同的无机离子对降解罗丹明B的影响。实验结果表明:在罗丹明B初始浓度为4mg/L,K2S2O8用量为0.4g/L,p H值为2,紫外光降解40min的条件下,罗丹明B的脱色率最大可达98.71%,TOC去除率达73.78%。同时不同的无机离子对反应体系有一定的抑制作用。
UV-activated potassium persulfate was used to produce sulfate radical with strong oxidizing activity. Rhodamine was used as the target pollutant. The oxidative degradation of rhodamine B by sulfate radical was investigated. The effects of K2S2O8 concentration, initial concentration of rhodamine B, illumination time, pH value of solution and different inorganic ions on the degradation of rhodamine B were studied. The experimental results showed that the decolorization rate of Rhodamine B was up to 98.71% under the conditions of initial concentration of rhodamine B 4mg / L, K2S2O8 0.4g / L, p H value 2 and UV degradation 40min, and TOC Removal rate of 73.78%. At the same time, different inorganic ions have a certain inhibitory effect on the reaction system.