不同前处理方式对铁屑还原降解土壤中对硝基苯酚的影响  

Effect of different pre-processing methods on reductive degradation of p-nitrophenol in soils by iron chips

作　　者：邱罡[1] 陈宜菲[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,潮州521041

出　　处：《环境工程学报》2010年第3期654-658,共5页Chinese Journal of Environmental Engineering

基　　金：广东省自然科学基金资助项目(04106270)

摘　　要：为推动铁屑在治理受硝基酚类化合物污染土壤中的实际应用,常温(25±1℃)常压下,利用不同前处理方式处理的铁屑、还原铁粉对土壤中的对硝基苯酚(p-NP)进行了还原降解研究;分析了土壤部分理化性质对p-NP还原效果的影响;并对反应时间、铁屑用量和土壤含水量3个人工易控因素作了最优化选择。结果表明:铁屑和铁粉对p-NP还原降解效果影响的大小顺序为:酸洗铁屑>还原铁粉>水洗铁屑>碱洗铁屑;适中的土壤含水量、偏酸性的土壤初始pH值及较高的土壤有机质含量均可显著提高铁屑对p-NP的还原率;正交实验结果显示反应时间对p-NP还原效果影响最大,铁屑用量次之,土壤含水量最小;处理1.5 g p-NP浓度约为1.3×10-5mol/g的模拟污染土壤的反应最优化条件为:酸洗铁屑用量26 mg,土壤含水量0.35 mL,反应时间130 m in,还原率可达到96.4%。To promote the practical applications of iron chips in the treatment of contaminated soils by nitro-phenolic compounds,the remediation of p-nitrophenol（p-NP）-contaminated soils with different pre-processing iron chips or zero-valent iron（ZVI,Fe0） at ambient temperature（25±1℃） and pressure was studied.The influences of some physicochemical properties of soils on reduction efficiency of p-NP were tested.And by optimizing the parameters such as the reaction time,the application rate of iron chips and the content of soil moisture,the optimum conditions were obtained.The experimental results indicated that,the effects of iron chips and ZVI in the reductive degradation of p-NP give the following subsequence（from great to little）： iron chips with acid treatment,ZVI,iron chips with water treatment,iron chips with alkali treatment.In addition,results showed that moderate moisture content,a lower acidity and a higher organic matter content of the soil may significantly increase the reduction rate.Orthogonal experiment results showed that the factors which could be controlled in practice were especially useful in the reduction reaction,the reaction time was the greatest one,and then was the application rate of iron chips,the soil moisture content was the smallest one.Under the optimum conditions,1.5 g contaminated soil samples with 1.3×10-5mol/g p-NP and 26 mg iron chips with acid treatment and 0.35 mL distilled water,after 130 min of reaction,the reduction rate of p-NP was 96.4%.

关 键 词：铁屑 对硝基苯酚 土壤 还原降解 

分 类 号：X53[环境科学与工程—环境工程]