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Acta Physico-Chimica Sinica  2010, Vol. 26 Issue (03): 552-560    DOI: 10.3866/PKU.WHXB20100310
CHEMICAL KINETICS AND MOLECULE DYNAMICS     
Comparison Study between Mg2+-K+ and Ca2+-K+ Exchange Kinetics under Electric Fields at the Solid-Liquid Interface of Soil
LI Rui, LI Hang
College of Resources and Environment, Southwest University, Chongqing 400716, P. R. China
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Abstract  

Comparison study between Mg2+ and Ca2+ adsorption kinetics, as influenced by different particle surface potentials, was investigated by the miscible displacement technique. In this study, important new features of ion adsorption were discovered. (1) The initial stage of experiment the adsorption process had zero-order kinetics because of strong adsorption. First-order kinetics then resulted because of weak adsorption and the transition point from zero-order to first-order kinetics was very sharp for each system. (2) At equivalent supporting electrolyte concentrations, the adsorption rate of Ca2+ is obviously faster than that of Mg2+,and the equilibrium adsorption capacity of Ca2+ is more than that of Mg2+. The coverage of Ca2+ on the solid soil particle's surface is also higher than that of Mg2+. (3) The differences between the relative effective charge coefficient and the surface electrochemical properties are the reason why the Ca2+, Mg2+ adsorption kinetics are different. (4) We also determined some important properties of the adsorbed ions such as the rate coefficients, the adsorption quantities, the surface coverage of the adsorbed ions and the distributed space in the fixed liquid film of the adsorbed ions. These parameters allow a future quantitative evaluation of the effects of different colloid surface potentials on the ion diffusion/adsorption kinetics.



Key wordsSolid-liquid interface      Surface electric field      Relative effective charge coefficient      Ion adsorption      Kinetics     
Received: 30 September 2009      Published: 19 January 2010
MSC2000:  O648  
Corresponding Authors: LI Hang     E-mail: hli22002@yahoo.com.cn
Cite this article:

LI Rui, LI Hang. Comparison Study between Mg2+-K+ and Ca2+-K+ Exchange Kinetics under Electric Fields at the Solid-Liquid Interface of Soil. Acta Physico-Chimica Sinica, 2010, 26(03): 552-560.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20100310     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2010/V26/I03/552

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