Competitive Adsorption of Metal Ions onto Hydrophilic Silicon Surfaces from Aqueous Solution

吸附 金属 水溶液 化学 无机化学 硝酸 电化学 水溶液中的金属离子 朗缪尔 沉积(地质) 物理化学 电极 有机化学 古生物学 生物 沉积物
作者
Lee M. Loewenstein,Florence Charpin,Paul Mertens
出处
期刊:Journal of The Electrochemical Society [Institute of Physics]
卷期号:146 (2): 719-727 被引量:28
标识
DOI:10.1149/1.1391670
摘要

Si surfaces prepared using the IMEC‐clean were exposed to a dilute solution of ten metals, Ba, Ca, Co, Cr, Cu, Fe, K, Ni, Sr, and Zn, in dilute nitric acid solution. The metal deposition onto hydrophilic silicon surfaces was found to be dependent on the metal concentration, pH, and adsorption time, the power‐dependence of metal surface concentrations, as expressed in , ranged from 0.27 for to 0.73 for , with an average value of 0.54. The power dependence of metal surface concentrations, as , ranged from −0.07 for K to −0.56 for Sr, with an average value of −0.30. We interpret these results to be consequences of all cations, in solution, including , competing for a limited number of adsorption sites. Using the Langmuir assumptions for adsorption behavior, we derive mathematical relationships for such behavior, with the key result being is the surface concentration of the metal, the solution concentration of the metal cation, and is the equilibrium constant governing its attachment to the surface, for the ith species. σ is the areal density of adsorption sites on the surface. Summation proceeds over all cations, including , in solution. Consequences of this relationship include the observed fractional power dependencies of and the metal cations, and the reduced adsorption onto the surface of any given metal cation when in the presence of other cations, including . © 1999 The Electrochemical Society. All rights reserved.
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