摘要
使用序批实验方法,研究熟污泥改性黄土对镉(Cd)的吸附解吸特征。结果表明:Cd初始添加浓度大于20 mg/L,供试改性黄土对Cd的吸附等温线发生显著变化;Freundlich型吸附等温式是描述供试改性黄土对Cd吸附过程的最佳模型。各土样对Cd的解吸量与吸附量的关系可以用幂函数很好地描述。随着土样中熟污泥含量的增加,Cd的吸附固定作用增强。有机质成分是影响供试土样Cd固定能力最大的因素。
Laboratory batch experiments were conducted to study the sorption and desorption of cadmium （Cd） in loess improved by composted sludge. The results showed that there was significant difference in change rules of adsorption isotherm before and after 20 mg/L of the initial Cd concentration. Cd absorption behavior could be described by Freundlich equation and relation between adsorption and desorption of Cd could be described by exponential function. Stable adsorption capacity increased with the concentration of composted sludge in soil samples increased. The organic matter in soil samples has the greatest contribution to the stable ability of Cd.
出处
《土壤》
CAS
CSCD
北大核心
2015年第3期578-582,共5页
Soils
基金
国家自然科学基金项目(NSFC 51178209
NSFC 91025015)
兰州大学中央高校基本科研业务费专项资金项目(lzujbky-2014-279)资助
关键词
熟污泥
黄土
镉
吸附
解吸
Composted sludge
Loess
Cadmium
Sorption
Desorption
