Diffusion mechanism and ion exchange equilibria of some heavy metal ions on cerium(IV) antimonate as cation exchanger

被引：18
|
作者：
El-Naggar, IM [1 ]
Zakaria, ES [1 ]
Shady, SA [1 ]
Aly, HF [1 ]
机构：
[1] Atom Energy Author, Hot Labs Ctr, Cairo, Egypt
来源：
SOLID STATE IONICS | 1999年 / 122卷 / 1-4期
关键词：
D O I：
10.1016/S0167-2738(98)00548-7
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The kinetics and mechanism of diffusion of Zn2+, Sr2+, Co2+ and Eu3+ in the H+-form of cerium(IV) antimonate (CeSb) have been studied as a function of particle sizes, reaction temperatures and solution concentrations of the exchanging ions. The exchange rate was controlled by particle diffusion mechanism as a limited batch technique. The physical thermodynamic parameters such as, activation energies and entropies of activation have been evaluated. The mobility of these ions inside the particles of the exchanger decrease in the order: Zn2+ > Sr2+ > Co2+ > Eu3+ (C) 1999 Elsevier Science B.V. All rights reserved.
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页码：65 / 70
页数：6
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