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零价铁活化过二硫酸盐氧化降解阿特拉津

蔡涛,张璐吉,胡六江,董华平*,李益民   

  1. (绍兴文理学院化学系 绍兴 312000)
  • 收稿日期:2012-01-16 修回日期:2012-03-30 出版日期:2013-01-10 发布日期:2013-01-10
  • 通讯作者: 董华平，博士; Tel:0575-88342592; Fax:0575-88341521; E-mail:olive180@163.com; 研究方向：生物与环境工程，环境化学
  • 基金资助:
    浙江省科技厅科技计划分析测试基金（2011C37012）浙江省大学生科技创新(2010R426026) 资助项目

Degradation of Atrazine by Peroxydisulfate Activate with Zero-valent Iron

CAI Tao, ZHANG Luji, HU Liujiang, DONG Huaping*, LI Yimin   

  1. (Department of Chemistry,Shaoxing College of Arts and Sciences,Shaoxing 312000,China)
  • Received:2012-01-16 Revised:2012-03-30 Published:2013-01-10 Online:2013-01-10

PDF

2030

被引次数

42 | 5

摘要： 利用零价铁(Fe0)活化过二硫酸钠（PDS）产生硫酸根自由基(SO-4·)降解环境中的阿特拉津。 初步探讨了介质初始pH值、PDS初始浓度、Fe0加入量对阿特拉津降解率的影响，并比较了铁量相同的Fe0/PDS、Fe2+/PDS和Fe3+/PDS 3种体系对阿特拉津的降解能力。 结果表明，在初始pH=6.5、1 mL初始浓度为2.0 mmol/L PDS、Fe0加入量为28 mg的条件下，反应60 min后，Fe0/PDS体系对100 mL浓度为0.10 mmol/L阿特拉津的降解率达到99.0%，远高于Fe0、PDS、Fe2+/PDS和Fe3+/PDS 4种体系对阿特拉津的降解率。 另外，酸性介质、增加Fe0或PDS的投入量均有利于提高阿特拉津的降解率。 同时，通过采用甲醇和叔丁醇作为分子探针鉴定了Fe0/PDS体系中产生的活性中间体SO-4·和羟基自由基（·OH）。

关键词: 零价铁, 过二硫酸盐, 硫酸根自由基, 阿特拉津

Abstract: In this paper, SO-4· was activated by peroxydisulfate(PDS) with zero-valent iron(Fe0) in aqueous, and its activity was tested by removing atrazine. Influencing factors including the initial pH, initial concentration of PDS and dosage of Fe0 were tested. The results indicated that removal efficiencies of atrazine(100 mL 0.10 mmol/L) by Fe0/PDS reached 99.0% within 60 min at pH=6.5, 1 mL PDS initial concertration 2.0 mmol/L, 28 mg Fe0, which was much higher than that when Fe0 or PDS was used alone, and superior to the Fe2+/PDS or Fe3+/PDS with the same amount of iron. Results also showed that the oxidation process of atrazine by SO-4· was facilitated by lowering pH, and the removal efficiency increased with raising the initial concentration of PDS or iron dosage. In addition, the reactive intermediates were identified as SO-4· and hydroxyl radicals(·OH) by employing methanol(MeOH) and tert-butyl alcohol(TBA) as the radical quenching agents.

Key words: zero-valent iron, peroxydisulfate, sulfate radicals, atrazine

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