Fe^0对土壤中对氯硝基苯和对硝基甲苯的还原  

Reduction of p-chloronitrobenzene and p-nitrotoluene by Fe^0 in soils

作　　者：邱罡[1] 谢凝子[1] 陈少瑾[1] 吴双桃[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：《生态环境》2008年第4期1509-1513,共5页Ecology and Environmnet

基　　金：广东省自然科学基金项目(04106270)

摘　　要：采用零价铁(Fe0)还原技术,在25℃和常压下修复受对氯硝基苯(PCNB)和对硝基甲苯(PNT)混合污染的土壤,研究不同反应条件对还原反应的影响及产物在反应历程中的变化。实验结果表明:零价铁能够有效地将土壤中PCNB和PNT还原为其对应的苯胺化合物。在PCNB和PNT的初始含量约为2.5×10-6mol·g-1,Fe0加入量为25mg·g-1,土壤水分含量为0.75mL·g-1,土壤初始pH值为6.8,于25℃下反应5h,PCNB和PNT的还原率都可达93%以上。Fe0用量、土壤初始pH值、温度和土壤含水量均对Fe0还原硝基苯类化合物有较明显影响,偏酸性的土壤、较高的温度、增加Fe0用量和饱和的土壤含水量能显著提高还原率。Zero-valent iron （ZVI or Fe^0） reduction technique was utilized for the remediation of soils contaminated with mixed p-chloronitrobenzene （PCNB） and p-nitrotoluene（PNT） at 25 ℃ and ambient pressure. The effects of several reaction conditions on the reduction as well as the change in reduction products were investigated. The experimental results indicated that Fe^0 was effective in reducing the PCNB and PNT to their corresponding amines. When Fe^0 at a dosage of 25 mg·g^-1 was introduced to a soil containing 2.5×10^-6mol·g^-1 of mixed PCNB and PNT, the rate of reduction at 5 h for both PCNB and PNT was more than 93% under these conditions： temperature 25 ℃, initial soil pH 6.8, soil water contents 0.75 mL·g^-1. The dosage of Fe^0, the initial soil pH, the reaction temperature and the soil water contents all had obvious impacts on the reduction. A higher dosage of Fe^0, an acidic soil pH, a higher temperature and near saturation water contents seemed to significantly promote the rate of reduction.

关 键 词：对氯硝基苯 对硝基甲苯 零价铁 还原 土壤 

分 类 号：X131.3[环境科学与工程—环境科学]