Combined measurement of surface properties of particles and equilibrium parameters of cation exchange from a single kinetic experiment
Combined measurement of surface properties of particles and equilibrium parameters of cation exchange from a single kinetic experiment
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DOI：
10.1039/c4ra02407a
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发表时间：
2014-06
期刊：
影响因子：
3.9
通讯作者：
Rui Li;Hang Li;Xinmin Liu;R. Tian;Hualin Zhu;Hailing Xiong
中科院分区：
文献类型：
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作者：
Rui Li;Hang Li;Xinmin Liu;R. Tian;Hualin Zhu;Hailing Xiong
对于阳离子交换中的库仑力吸附，平衡参数与水溶液中颗粒的表面性质密切相关。通过引入修饰系数来描述阳离子的相对有效电荷，考虑到参与交换的两种阳离子的极化差异，提出了估计交换平衡参数和粒子表面性质的新方法。我们的理论表明，仅依靠一阶阳离子吸附速率方程的斜率和截距两个参数，就可以很容易地得到以下平衡参数和粒子的重要表面性质：(1)表面电位，(2)比表面积，(3)电荷密度，(4)表面静电场强度，(5)选择性系数，(6)吸附相中阳离子的活度系数，(7)强弱吸附力平衡下各阳离子的吸附量。首次通过粒子的选择性系数和表面电位与极化率和电荷之间的定量关系，建立了阳离子的种类数。结果表明，参与交换的两种阳离子的极化率差异对阳离子交换平衡和粒子表面性质有很大影响。
For the Coulombic force adsorption in cation exchange, equilibrium parameters were closely related to the surface properties of particles in aqueous solution. Taking into account the difference in the polarization of two cation species involved in the exchange by introducing a modification coefficient for describing the relatively effective charges of the cation species, the new approaches for estimating exchange equilibrium parameters and surface properties of particles have been developed. Our theory indicates that, just relying on two parameters, the slope and intercept of the first-order rate equation of cation adsorption, the following equilibrium parameters and important surface properties of particles can be obtained easily: (1) surface potential, (2) specific surface area, (3) charge density, (4) electrostatic field strength at the surface, (5) selectivity coefficient, (6) activity coefficients of cation species in the adsorption phase, (7) adsorption quantity of each cation species at equilibrium with strong and weak force adsorption. For the first time, by the quantitative relationship between the selectivity coefficient and surface potential of particles together with polarizability and charge, the number of cation species is established. The results show the difference in the polarizability between two cation species involved in the exchange strongly influences the cation exchange equilibrium and surface properties of particles.