黑土和黑钙土对Cu^(2+)的吸附作用及影响因素  

Cu^(2+) Adsorption of Black Soil and Chernozem and Its Influencing Factors

作　　者：吉凡[1] 王帅[2] 王开爽[1] 王莉[1] 张晋京[1] 

机构地区：[1]吉林农业大学资源与环境学院,长春130118 [2]吉林农业科技学院植物科学学院,吉林132101

出　　处：《吉林农业大学学报》2014年第4期447-453,共7页Journal of Jilin Agricultural University

基　　金：国家科技支撑计划项目(2013BAD07B02;2013BAC09B01);农业部公益性行业(农业)科研专项(201103003);吉林省博士后项目(01912)

摘　　要：以黑土和黑钙土为供试土壤,采用批量平衡法,研究了pH、离子强度、温度和反应时间对土壤吸附Cu2+的影响。结果表明:随着pH增加,两类土壤对Cu2+的吸附量均增大,pH>7时吸附量达到饱和,黑钙土对Cu2+的吸附量高于黑土;随着反应体系离子强度的增大,两类土壤对Cu2+的吸附率均有所降低,其中在硝酸钠浓度为0~0.2 mol/L时降幅较大;随着温度和溶液中初始Cu2+浓度的升高,两类土壤对Cu2+的吸附量亦有所增加,黑土和黑钙土对Cu2+的吸附等温线分别用Freundlich方程和Langmuir方程描述较为精确,表观热力学参数的计算结果表明两类土壤对Cu2+的吸附均为自发、吸热和熵增加的过程;在描述黑土和黑钙土吸附Cu2+的动力学过程中,Elovich方程和抛物线扩散方程的拟合效果最佳。Using black soil and chernozem as tested soil, the effects of pH value, ionic strength, temperature and reaction time on adsorption behaviors of Cu2＋ were studied by the batch equilibrium method, which provides basic data for Cu2＋ application and pollution prevention on the two types of soil. The results showed that Cu2＋ adsorption of the two types of soil increased with the increase of pH. When the pH was higher than 7, their adsorption amount was saturated. The amount of Cu2＋ adsorbed by chernozem was higher than that of black soil. However, Cu2＋ adsorption decreased with the increase of ionic strength. The absorption ratio decreased significantly in the NaNO3 solution with the concentration between 0--0. 2 mol/L. With temperature and initial Cu2＋ concentration increasing in the solution, the absorption ratio of Cu2＋ increased in both samples. The best way to describe the relationship between absorption ratio and temperature was Freundlich and Langmuir equations. Apparent thermodynamic parameters showed that Cu2＋absorption of the two types of soil was spontaneous,during which heat was absorbed and entropy was accumulated. For the Cu2＋ adsorption kinetics process, Elovich Equation and Parabolic Diffusion Equation were more available to black soil and chernozem analysis.

关 键 词：黑土 黑钙土 铜 吸附量 离子强度 

分 类 号：S153[农业科学—土壤学]