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以新烟碱类杀虫剂呋虫胺为目标污染物,以过硫酸钾为氧化剂,研究不同热活化条件下过硫酸钾对呋虫胺降解率的影响。实验结果表明:呋虫胺的降解率与溶液中过硫酸钾的浓度成正比;随着温度的升高,呋虫胺的降解率也逐渐升高;虽然中性时呋虫胺的降解率稍高于酸性和碱性时的降解率,但pH的变化对呋虫胺的降解率影响不大;Cl~-和HCO-3对反应的影响比较复杂,当溶液中的Cl~-和HCO_3~-的浓度低于5 mmol/L时,均促进呋虫胺的降解,而浓度升高时则抑制呋虫胺的降解;通过添加自由基捕获剂发现,该反应体系中同时存在·SO_4~-和·OH,但起主要作用的是·SO_4~-。
Taking neonicotinoid insecticide dinotefuran as the target pollutant and potassium persulfate as oxidant, the effects of potassium persulfate on the degradation rate of dinotefuran were studied under different heat activation conditions. The experimental results show that the degradation rate of dinotefuran is proportional to the concentration of potassium persulfate in solution, and the degradation rate of dinotefuran is also gradually increased with the increase of temperature. Although the degradation rate of dinotefuran is slightly The degradation rate of dinotefuran was not affected by the change of pH. The effect of Cl ~ - and HCO-3 on the reaction was rather complicated. When the contents of Cl ~ - and HCO_3 ~ - was lower than 5 mmol / L, both of them promoted the degradation of dinotefuran. However, the degradation of dinotefuran was inhibited when the concentration was increased. By addition of free radical scavenger, it was found that SO_4 ~ And · OH, but played a major role is · SO_4 ~ -.