摘要
研究了Cu^2+、Pb^2+在2种土壤上的竞争吸附动力学过程.结果表明,Cu^2+、Pb^2+在乌栅土上的吸附量均高于在红壤上的吸附量,Pb^2+又较Cu^2+在土壤上的吸附量大.分别用一级、二级动力学方程、抛物线方程、Elovich方程和幂函数方程对该吸附动力学过程进行了拟合,其中幂函数方程拟合结果最好.Cu^2+、Pb^2+在乌栅土上的吸附主要是通过与土壤中的Ca^2+、Mg^2+进行交换,其累积吸附量与Ca^2+、Mg^2+的累积解吸量线性关系显著(R^2为0.990~1);在红壤上是通过与土壤中的H^+进行离子交换而吸附,Pb^2+对Ca^2+和Mg^2+的交换能力比Cu^2+强,其存在显著降低了Cu^2+在2种土壤上的吸附量;Cu^2+的存在略降低Pb^2+在土壤上的吸附量。
Competitive adsorption kinetics process of Cu^2+ and Pb^2+ in two kinds of soil was studied. The adsorption quantities of Cu^2+ and Pb^2+ on Wushan soil were all higher than those of red soil. The adsorption quantity of Pb^2+ was larger than that of Cu^2+ in soil; these adsorption kinetic processes were fitted with the equations of first-order, second-order, parabola, Elovich and power function, respectively, in which the power function equation fitting results was the best, The adsorption of Cu^2+ and Pb^2+ on Wushan soil was mainly through exchange of Ca^2+ and Mg^2+ in soil, with marked linear relation between accumulative adsorption quantities and accumulated desorb-quantities of Ca^2+ and Mg^2+ (R^2 was 0.990-1), the adsorption on red soil was through ion exchange of H^+ in soil, The exchange capacity of Pb^2+ on Ca^2+ and Mg^2+ was stronger than Cu^2+, its existence lowered markedly the Cu^2+ adsorption quantities on 2 kinds of soil; the existence of Cu^2+ lowered a little the adsorption quantity of Pb^2+ in soil.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2006年第5期555-559,共5页
China Environmental Science
基金
国家"973"项目(2002CB410808)
中国科学院创新团队国际合作伙伴计划项目(CXTD-Z2005-4-1).