Fe^0还原土壤中不同结构甲基和氯代硝基苯

Reduction of Methyl and Chloro Substituted Nitrobenzenes in Soils by Zero-valent Iron

采用零价铁(Fe0)在常温常压下分别还原土壤中邻、间、对三种氯代硝基苯和硝基甲苯。结果表明:相同取代基在苯环上不同取代位置对还原率的影响差别不大。在硝基芳烃化合物浓度约为2.5×10-6mol/g,Fe0加入量为50 mg/g,25℃条件下,经过5天反应,邻、间、对三种硝基甲苯的还原率均在70%左右,三种氯代硝基苯的还原率则在90%以上。结合计算机模拟所得的六种硝基芳烃的质子亲和力和电子亲和力,对Fe0还原这两类硝基芳烃的机理进行了初步探讨。

At ambient temperature and pressure, Zero -valent iron（ZVI）was used to decompose nitrotoluene（NT） and chloronitrobenzene（CNB） in soils. Experimental results showed that neither NT nor CNB has obvious difference among three substituted locations（o - ,m - ,p - ） on nitrobenzenes. It was found that about 70% of NT and 90% of CNB in soils could be reduced after 5 days of reaction with 50 mg/g of ZVI and at the temperature of 25℃. In addition, possible mechanisms of the reduction reaction was proposed and discussed with proton and electron of the chloro and methyl substituted nitrobenzencs calculated by computer.