污染控制技术及原理
陈宜菲,陈少瑾.利用零价铁还原土壤中硝基苯类化合物的研究[J].环境科学学报,2007,27(2):241-246
利用零价铁还原土壤中硝基苯类化合物的研究
- Reduction of nitrobenzenes in soils by zero-valent iron
- 基金项目：广东省自然科学基金项目(No.04106270)
- 作者
- 单位
- 陈宜菲
- 韩山师范学院环境化学应用技术研究所, 潮州 521041
- 陈少瑾
- 韩山师范学院环境化学应用技术研究所, 潮州 521041
- 摘要：利用零价铁(ZVI,Fe0)还原技术,对受2-硝基甲苯(OMNB)和2-氯硝基苯(OCNB)这2种硝基苯类化合物污染土壤的修复进行了研究.实验结果表明,在常温常压下,ZVI可有效地将土壤中的OMNB和OCNB还原成相应的苯胺类化合物,当2种硝基苯化合物在土壤中的含量均约为2.5×10-6mol·g-1,ZVI加入量为25mg·g-1,于25℃下反应6h,OMNB的还原率可达到97%,OCNB的还原率则高达100%;ZVI对OCNB的还原效率比OMNB稍高;这2种硝基苯类化合物的还原率均随反应时间的延长、ZVI用量的增加、温度的升高而升高,特别是当土壤初始pH值控制在偏酸性时更有利于还原反应的进行.此外,根据实验结果和相关的理论计算对ZVI还原硝基苯类化合物的反应机理进行了初步探讨.
- Abstract：In this paper, the zero-valent iron (ZVI,Fe0) reduction technique was adopted to investigate the remediation of a soil contaminated by 2-methyl-nitrobenzene (OMNB) and 2-chloro-nitrobenzene (OCNB). The experimental results indicated that ZVIwas effective in reducing the OMNBand OCNBin soils to their respective anilines. At ambient temperature (25℃) and pressure, and after 6 hours of reaction, the reduction rate for OMNBwas 97% and the rate for OCNBreached as high as 100% when the individual soil concentrations of these two nitrobenzens were about 2.5×10-6mol·g-1 and the dose of ZVIwas 25mg·g-1 . The reduction efficiency by ZVIfor OCNBwas slightly higher than OMNB. Laboratory data also showed that a longer reaction time and a higher dosage of ZVIas well as a higher temperature of reaction seemed to promote the rates of reduction. An acidic initial soil pHwas especially useful in facilitating the reduction reaction. In addition, a preliminary elucidation of the likely mechanisms of the reductive reactions of nitrobenzenes by ZVIin soils was given based on the experimental results and some theoretical calculations.
- Key words：2-chloro-nitrobenzene (OCNB) 2-methyl-nitrobenzene (OMNB) zero-valent iron (ZVI) soil reduction
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