影响废铁屑还原土壤中4-硝基苯胺的因素研究  

Research the Factor Impacting the Reduction of 4-nitroaniline in Soil by Debris Scrap Iron

作　　者：陈宜菲[1] 邱罡[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：《安徽农业科学》2009年第31期15335-15337,15390,共4页Journal of Anhui Agricultural Sciences

基　　金：广东省自然科学基金项目(04106270)

摘　　要：[目的]推动铁屑在治理有机物污染土壤中的实际应用。[方法]利用机械厂废弃铁屑在常温常压下对土壤中的4硝-基苯胺(p-NA)进行还原,并对影响还原反应的各种因素进行研究。[结果]废铁屑可将土壤中的p-NA还原成苯二胺,提高了其生物降解性。在土壤中p-NA的初始浓度为1.3×10-5mol/g、铁屑加入量67 mg/g、加水量0.33 m l/g、土壤初始pH值为6.45条件下,经过4 h反应后,p-NA的还原率可达100%。铁屑的前处理方式对p-NA还原率影响的大小顺序为:酸洗>水洗>碱洗;在一定范围内,增加铁屑用量和土壤含水量能有效提高p-NA的还原率;土壤酸度、有机质含量和反应温度对p-NA还原效率的影响较小。[结论]废铁屑可将土壤中的p-NA还原成苯二胺,提高了其生物可降解性,为铁屑治理有机物污染土壤提供了科学借鉴。[ Objective ] The practical application of the scrap iron in the treatment of organic pollution of soil was promoted. [ Method ] Under normal temperature and pressure,the scrap iron from the mechanical plant was used to do the reduction of 4-nitroaniline（p-NA） in soil and the various factors impacting the reduction reaction was studied. [ Results] The p-NA in soil could be reduced into phenylene diamine with scrap iron and its biodegradability was improved. The reduction rates of p-NA was up to 100% while the reaction was conducted for 4 hours under the condition of the initial concentration of p-NA, 1.3 ×10^-3mol/g; the amount of scrap iron added,67 ms/g; the amount of water-adding,0.33 ml/g and the initial pH value in soil,6.45. The order of the pre-treatment of scrap iron affecting the reduction of p-NA was：acid washing 〉 water washing 〉 alkali washing. Within a certain range,the amount-increasing of scrap iron and moisture in soil could improve the reduction rate of p-NA; and the soil acidity, organic matter content and reaction temperature was with less efficiency on the reduction rate of p-NA. [ Conclusion] The p-NA in soil could be reduced onto phenylene diamine with scrap iron and its biodegradability was improved. The scientific reference for the treatment of iron contaminated soil of organic matter was provided. The scientific reference for the treatment of iron contaminated soil of organic matter was provided.

关 键 词：铁屑 4-硝基苯胺 还原 影响因素 

分 类 号：S156.99[农业科学—土壤学]