零价铁活化过二硫酸盐氧化降解阿特拉津  

Degradation of Atrazine by Peroxydisulfate Activated with Zero-valent Iron

作　　者：蔡涛[1] 张璐吉[1] 胡六江[1] 董华平[1] 李益民[1] 

机构地区：[1]绍兴文理学院化学系绍兴312000

出　　处：《应用化学》2013年第1期114-119,共6页Chinese Journal of Applied Chemistry

基　　金：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

摘　　要：利用零价铁(Fe0)活化过二硫酸钠(PDS)产生硫酸根自由基(SO4-.)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SO4-.和羟基自由基(.OH)。In this paper, SO4-· 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 retool/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 SO4- 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 SO4- and hydroxyl radicals （ ·OH） by employing methanol（MeOH） and ten-butyl alcohol（TBA） as the radical quenching agents.

关 键 词：零价铁 过二硫酸盐 硫酸根自由基 阿特拉津 

分 类 号：O643.4[理学—物理化学] X592[理学—化学]