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不同路域植被类型土壤对Cu2+和Pb2+吸附特性的比较
引用本文:张振斌,王思远,刘宛宜,杨楠,沈力,焦昕倩.不同路域植被类型土壤对Cu2+和Pb2+吸附特性的比较[J].吉林大学学报(理学版),2012,50(6):1264-1268.
作者姓名:张振斌  王思远  刘宛宜  杨楠  沈力  焦昕倩
作者单位:吉林大学 环境与资源学院, 长春 130012
基金项目:国家科技重大专项基金(批准号:2012ZX07207-009)
摘    要:采用振荡平衡法研究Cu2+和Pb2+两种重金属在长春地区一些典型路域植被土壤中的热力学和动力学吸附特性. 结果表明: 这两种重金属在不同土壤中的吸附等温线均符合Langmuir方程和Freundlich方程, 但Langmuir方程的拟合效果更好, 即两种重金属在不同土壤中的吸附过程更接近单分子层吸附模型; 灌木丛植被类型的土壤对Cu2+和Pb2+的饱和吸附量最大, 分别为3 429,5 311 mg/kg; 灌木丛植被类型的土壤对重金属的吸附速率最大, 由Elovich方程可知, 这与该土壤的pH值、 阳离子交换量(CEC)、 有机质含量和黏粒含量较高等理化性质有关, 且Pb2+比Cu2+更易被土壤吸附.

关 键 词:路域土壤            吸附特性  
收稿时间:2012-03-31

A Comparative Study of the Adsorption Characteristics of the Cu2+ and Pb2+ into Soils with Different Vegetation along the Road Area
ZHANG Zhen-bin,WANG Si-yuan,LIU Wan-yi,YANG Nan,SHEN Li,JIAO Xin-qian.A Comparative Study of the Adsorption Characteristics of the Cu2+ and Pb2+ into Soils with Different Vegetation along the Road Area[J].Journal of Jilin University: Sci Ed,2012,50(6):1264-1268.
Authors:ZHANG Zhen-bin  WANG Si-yuan  LIU Wan-yi  YANG Nan  SHEN Li  JIAO Xin-qian
Institution:College of Environment and Resources, Jilin University, Changchun 130012, China
Abstract:In order to understand the migration and transformationof heavy metal pollutants in the soil covered by different road area vegetation in the Changchun area, the thermodynamics and kinetics of the adsorption of Cu2+ and Pb2+ in these soils were studied with the batch equilibration method. The results show that the adsorption isotherms of the two heavy metals in different soil both fit the Langmuir equation and Freundlich equation, but both better fit the Langmuir equation, which shows that the adsorption process was closer to the monolayer adsorption model. For the soil covered with the bush vegetation, the saturation adsorption capacities of the Cu2+ and Pb2+ were the largest, respectively reached 3 429,5 311 mg/kg. Elovich equation can describe the adsorption kinetics processes of the Cu2+ and Pb2+ in these different soil better, the adsorption rate of the heavy metals into the soil covered with bush vegetation was the largest. The adsorption of these metals into the different soil was related to high pH value, CEC, organic matter content, clay content and other physical and chemical
properties. The results show that Pb2+ was easier to be absorbed by the soil than Cu2+, which was related to the physical and chemical properties of the heavy metals.
Keywords:road area soil  copper  lead  adsorption characteristics  
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