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UVA/Fe3O4活化过硫酸盐降解阿特拉津
安继斌,夏春秋,陈红宇,胡代鹏,等
作者单位E-mail
安继斌 重庆文理学院 环境材料与修复技术重庆市重点实验室 anjibin99@126.com 
夏春秋 重庆文理学院 环境材料与修复技术重庆市重点实验室  
陈红宇 重庆文理学院 环境材料与修复技术重庆市重点实验室  
胡代鹏 重庆文理学院 环境材料与修复技术重庆市重点实验室  
摘要:
为了解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。
关键词:  阿拉特津  四氧化三铁  硫酸根自由基  活性物种
DOI:
分类号:X592
基金项目:国家自然科学(21507007),重庆市教委科学技术研究项目(KJ1501110),重庆文理学院引进人才项目(R2015CH09)
Activation of persulfate by irradiated magnetite: Implications for abatement of Atrazine in aqueous solution
AN Jibin,CHEN Hongyu,XIA Chunqiu,HU Daipeng,et al
Abstract:
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 results of scavengers tests reveal that SO4-. is responsible for the major degradation of atrazine, and its contribution is about 96%, while the HO. play 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.
Key words:  Atrazine  magnetite  sulfate radical  Reactive Oxygen Species