摘要
抗坏血酸-过硫酸盐联合降解阿特拉津的研究对环境有机污染物的修复具有重要意义。为了解过硫酸盐在抗坏血酸活化下对阿特拉津的降解能力,考察了阿特拉津在不同过硫酸盐浓度、抗坏血酸浓度和pH值条件下的降解效果,同时对降解动力学进行了探讨。结果表明,抗坏血酸可以有效活化过硫酸盐来降解阿特拉津,酸性条件下的活化效果优于中性和碱性。当体系中(pH值=3)过硫酸盐浓度为5 mmol/L,抗坏血酸浓度为0.5 mmol/L时,阿特拉津降解率可达到99.4%,反应速率常数为0.2401 d^(-1)。动力学分析表明,各条件下阿特拉津的降解均符合准一级动力学。研究表明,抗坏血酸能够用于活化过硫酸盐,可以有效提升阿特拉津的降解效果。
Understanding the combined degradation of atrazine by ascorbic acid and persulfate is of great significance for the remediation of environmental organic pollutants.In order to analyze and evaluate the ability of persulfate activation by ascorbic acid to degrade atrazine,the effects of different concentrations of persulfate,ascorbic acid and pH on the degradation of atrazine were investigated,and the degradation kinetics was also discussed.Results show that atrazine can be effectively degraded by ascorbic acid activated persulfate.The activation effect of acidic conditions was better than that of neutral and alkaline condition.When the concentration of persulfate and ascorbic acid were 5 and 0.5 mmol/L,respectively(pH=3),the degradation ratio of atrazine peaked 99.4%and the degradation rate constant was 0.2401 d^(-1).Kinetic analysis show that the degradation of atrazine fitted to quasi first-order kinetics under all conditions.The results revealed that ascorbic acid can be used to activate persulfate,which can effectively improve the degradation effect of atrazine.
作者
韩昌序
于海艳
马利民
HAN Chang-xu;YU Hai-yan;MA Li-min(College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)
出处
《环境科技》
2021年第2期33-37,共5页
Environmental Science and Technology
