施污黄土对Cu的吸附解吸特征  

Sorption and desorption of Cu in loess amended with sewage sludge

作　　者：刘铮[1] 白英[1] 南忠仁[1] 

机构地区：[1]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2016年第1期56-61,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(51178209)

摘　　要：以施加了城市污泥的黄土(施污黄土)为研究对象,通过室内试验研究了施污黄土对Cu的吸附解吸特征,并分析了其对Cu的固定能力及其影响因素.结果表明:随着初始添加质量分数的增加,供试土样对Cu的吸附量增加;随着污泥含量的增加,供试土样对Cu的吸附量大幅增加,解吸量和解吸率呈减小趋势;随着吸附量的增加,供试土样对Cu的解吸量呈增加趋势.在Cu的低初始添加质量分数下,供试土样对Cu的解吸率较低;随着添加质量分数的增加,供试土样对Cu的解吸率呈增加趋势.Langmuir型吸附等温式是描述供试土样对Cu的吸附行为的最佳模型.供试土样对Cu的固定能力主要受有机质和pH的影响.Loess amended with sewage sludge was selected as the research object.Laboratory experiments were conducted to study the sorption and desorption of Cu in loess amended with sewage sludge,and the stable ability of Cu in soil samples was also explored.The results showed that with the increase of the initial Cu concentration,Cu absorption increased;with the increase of sewage sludge,Cu absorption in the soil samples greatly increased while the amount and percentage of Cu desorption decreased;with the increase of Cu absorption,Cu desorption increased.In the lower initial Cu concentration,Cu desorption percentage became lower.With the increase of initial Cu concentration,Cu desorption increased.The Langmuir model well described the equilibrium isotherms of Cu sorption.Organic matter and pH might have a major influence on the maximum fixed Cu in soil.

关 键 词：城市污泥 黄土 铜 吸附解吸 

分 类 号：X131.3[环境科学与工程—环境科学]