摘要
应用简单土壤体系———沙粒,分别在不同时间、初始pH、土水比及粒径条件下进行试验,模拟Ni2+污染土壤的过程,并拟合出其吸附动力学方程。对污染沙粒进行洗脱,供试的6种淋洗剂对Ni2+的洗脱量随其浓度的增加而上升,能显著地降低沙粒中Ni2+残余量,其作用大小顺序为:二乙三胺五乙酸>乙二胺四乙酸>腐殖酸>盐酸>柠檬酸>环糊精。各种淋洗剂对镍去除率受其pH、洗脱时间及淋洗液浓度的影响。腐殖酸洗脱率较大,且洗脱速率较快,洗脱速率常数为27.5×10-3min-1,腐殖酸洗脱Ni2+污染土壤的动力学模型以动力学一级方程拟合为最好。
Soil contamination by heavy metals was discussed based on their characteristics of contamination,formation and transition on sand grain.The adsorption and flushing characteristics of nickel ions on sand grain was studied.The adsorption condition was studied at different pH,time,ratio of sand grain to water,grain size.Effects of concentration,pH,shaking time on the extraction efficiency of nickel was studied.The results showed that flushing agents remarkably inhibited the adsorption of polluted sand grain for nickel,with a magnitude sequence of diethylene triamine pentaacetic acid>ethylene diamine tetraacetic acid>humic acid>hydrochloric acid>citric acid>cyclodextrin.Humic acid desorption constant is 27.5×10^(-3) min^(-1).At the present the flushing kinetics of pollution soil for nickel was best fit by one-level kinetic equation.
出处
《现代化工》
CAS
CSCD
北大核心
2006年第z2期132-135,137,共5页
Modern Chemical Industry
基金
国家留学基金委资助(22307S05)
东华理工学院博士基金(DHB0504)
东华理工学院核资源与环境工程技术中心开放测试基金
关键词
土壤修复
沙粒
镍
吸附
淋洗
腐殖酸
soil remedy
sand grain
nickel
adsorption
flushing
humic acid
