UVA/Fe3O4活化过硫酸盐降解阿特拉津

为了解SO₄-·（硫酸根自由基）对阿特拉津的降解能力，以Fe₃O₄为K₂S₂O₈活化试剂，以阿特拉津为研究目标污染物，运用UVA/Fe₃O₄/K₂S₂O₈体系系统探讨阿特拉津在不同环境因素下的降解过程，并对催化剂的稳定性和重复利用进行了考察.结果表明:UVA/Fe₃O₄可以有效活化K₂S₂O₈来降解阿特拉津，最佳c（K₂S₂O₈）为1 mmol/L，反应6 h阿特拉津降解率可达到90%.淬灭试验表明，SO₄-·是该体系中的主要活性物种，贡献率约为96%；HO·的作用比较弱.初始pH为3时，阿特拉津6 h的降解率为98%，总铁的溶出量达到0.9 mg/L；而初始pH为7时，体系对阿特拉津的降解率达到85%，基本没有总铁的溶出，表现出了一定的稳定性.在腐殖酸存在的条件下，UVA/Fe₃O₄/K₂S₂O₈体系对阿特拉津的降解效果优于UVA/Fe₃O₄/H₂O₂体系.对Fe₃O₄催化剂进行3次循环测试，阿特拉津的降解率分别为90%、89%和86%.研究显示，UVA/Fe₃O₄能用于活化K₂S₂O₈的高级氧化体系中，可有效降解除草剂阿特拉津. 

Activation of Persulfate by Irradiated Magnetite: Implications for Abatement of Atrazine in Aqueous Solution

Chlorotriazine Pesticides in aquatic environments raise an emerging environmental risk, providing a new challenge to sewage and drinking water treatment systems. In order to study the degradation of typical herbicides by sulfate radicals, magnetite activated persulfate was applied to abetment of atrazine under UVA irradiation. The effects of various parameters such as concentration of persulfate and pH value on degradation kinetics were studied. The stability and recyclability of catalyst were also investigated. The results indicated that atrazine can be effectively degraded by magnetite in presence of persulfate under UVA irradiation. After 6 h reaction, the degradation efficiency of atrazine was 90% at the optimal c(K₂S₂O₈) of 1 mmol/L. The test results of scavengers reveal that SO₄^-· is responsible for the major degradation of atrazine, and its contribution is about 96%, while HO· provides a minor contribution to the degradation. For pH 3 the degradation efficiency of atrazine was 98%, and the release of dissolved total Fe was 0.9 mg/L, while at pH 7 the degradation efficiency of atrazine was 85% and without release of iron during the activate tests. The UVA/Fe₃O₄/K₂S₂O₈ system was superior to the corresponding UVA/Fe₃O₄/H₂O₂ in the presence of natural organic matter. In three cycles runs, the degradation efficiency of atrazine was 90%, 89% and 86%, respectively. Therefore, the UVA/Fe₃O₄ was successfully applied for the activate of K₂S₂O₈, which can effectively remove atrazine.