零价铁对土壤中间氯硝基苯和间硝基甲苯的还原研究  

Reduction of m-Chloronitrobenzene and m-Nitrotoluene in Soils With Zero-Valent Iron(ZVI)

作　　者：邱罡[1] 谢凝子[1] 吴双桃[1] 陈少瑾[1] 

机构地区：[1]韩山师范学院环境化学应用技术研究所,广东潮州521041

出　　处：《生态与农村环境学报》2009年第2期84-87,共4页Journal of Ecology and Rural Environment

基　　金：广东省自然科学基金(04106270)

摘　　要：常温常压下,利用零价铁(ZVI)对土壤中间氯硝基苯(MCNB)和间硝基甲苯(MNT)2类污染物进行了修复研究。结果表明:ZVI能有效将MCNB和MNT还原为相应的苯胺类化合物,无进一步脱氯或脱甲基反应发生。反应时间、土壤含水量、土壤初始pH值、ZVI用量和反应温度均对还原效果有较明显的影响,当土壤中2种污染物各自浓度约为2.5×10-6mol.g-1,ZVI加入量为25mg·g-1,土壤含水量为0.75mL.g-1,初始pH值为6.8时,(25±1)℃条件下反应5h后,2种化合物的还原率均达到80%以上,较长的反应时间、偏酸性的土壤、较高的温度、ZVI用量的增加以及饱和的土壤含水量均能显著提高还原率。Remediation of m-chloronitrobenzene （MCNB）- or m-nitrotoluene （MNT）-contaminated soils with zero-valent iron （ZVI） at ambient temperature and pressure was studied. Results show that ZVI efficiently reduced MCNB and MNT in soils into their respective anilines, without triggering any further dechlorination reaction or further demethylase reaction. The efficiency of reduction was significantly affected by reaction time, soil moisture content, initial soil pH, ZVI dosage and reaction temperature. When in the soil the concentration of the two pollutants were about 2.5 × 10^-6 mol·g^-1, the moisture content 0.75 mL·g^-1, the initial pH 6.8 and the application rate of ZVI 25 mg·g^-1 soil, incubation at temperature （25±1） ℃ for 5 hours, over 80% of both pollutants were reduced. Laboratory data also show that a longer reaction time, a lower acidity, a higher dosage of ZVI and a relatively higher temperature of reaction as well as a saturated moisture content may significantly increase the reduction rate.

关 键 词：间氯硝基苯 间硝基甲苯 零价铁 土壤 还原 

分 类 号：X131.3[环境科学与工程—环境科学] X53