生态环境学报2012，Vol.21Issue(1)：101-106,6.
不同来源太湖沉积物粒径分布及其对Cu的吸附特征
Grain size distribution and adsorption characteristics of Cu on Taihu Lake sediments from different sources
摘要
Abstract
Sediments from different sources were sampled from Taihu Lake located Huzhou area in Zhejiang Province. Particle size test, particle-size grading and the copper content in different particle-size sediment were measured by Mastersizer 2000 laser particle size analyzer to study the absorption capacity of copper. The adsorption kinetics of Cu2+ on the sediment samples of Taihu Lake and the equilibrium adsorption of the different size sediment samples were studied by isothermal adsorption experiment. The adsorption mechanism was discussed by the particle size grading and the kinetic. The results showed that the size of Taihu Lake was ranged from 2 to 100 μm, and the sediments consisted of sand and clay-based powder. The copper content and the absorption capacity of Cu2+ were different in the different particle size sediment samples. Sediments with small size had strong adsorption ability. The copper content in particle-size which was less than 0.01mm was the highest in our study. The particle-size of 0.1 ~ lmm had the strongest copper adsorption capacity. The adsorption reaction could be divided into fast reaction stage and slow reaction stage and the adsorption process followed by surface adsorption. The adsorption kinetics followed a pseudo-second-order model (R2>0.999). The adsorption date fitted well into the Freundlich adsorption isotherm (R2>0.99). The maximum adsorption capacity of Cu2+ were 232, 278, 287 mg·kg-1 and the parameter 1/n was not suitable for the description of bonding capacity of heavy metal and sediments.关键词
沉积物/粒度/铜/吸附/吸附动力学Key words
Sediment/grain size/copper/adsorption dynamics分类
资源环境引用本文复制引用
刘玉真,成杰民,鲁成秀..不同来源太湖沉积物粒径分布及其对Cu的吸附特征[J].生态环境学报,2012,21(1):101-106,6.基金项目
国家重点基础研究发展计划项目(2008CB418200) （2008CB418200）
