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土壤圈(英文版). 2005, (03)

Mechanism for Cu2+ Sorption on PalygorskiteEnglish Full Text

CHEN Tian-Hu1, PENG Shu-Chuan1, XU Hui-Fang2, SHI Xiao-Li1 and HUANG Chuan-Hui1 1 School of Natural Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009 (China). 2 Department of Geology and Geophysics, University of Wisconsin, Madison, WI 53706 (USA)

Abstract: A single-factor experiment of copper ion adsorption on pure palygorskite was carried out to understand the Cu2+ sorption of palygorskite—an important clay mineral in soil and sedimentary rock. In addition, pH of the solution and the surface microstructure of palygorskite were investigated before and after adsorption. The experimental results indicated that efficiency of Cu2+ removal was related to the oscillation rate of the specimen shaker, sorption time, initial pH value and the amount of adsorbent added. Palygorskite induced Cu2+ hydrolysis and interaction between copper hydroxide colloids and palygorskite surfaces, as observed with transmission electron microscopy （TEM）, were the main contributions to palygorskite removal of Cu2+. This mechanism was different from adsorption at the mineral-water interface. It was proposed that surface hydrolysis of palygorskite raised the alkalinity of the palygorskite-water interface and suspension system. Thus, the induced pH of the solution was then high enough for Cu2+ hydrolysis on the mineral surface and in solution.
Keywords：

copper ion; palygorskite; sorption mechanism; transmission electron microscopy （TEM）;

  • Series：

    (D) Agriculture

  • Subject：

    Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S153;

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