Adsorption Equilibrium Equation of Carboxylic Acids on Anion-Exchange Resins in Water.
Adsorption Equilibrium Equation of Carboxylic Acids on Anion-Exchange Resins in Water.
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水中阴离子交换树脂上羧酸的吸附平衡方程。
DOI：
10.1006/jcis.2001.7511
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发表时间：
2001
影响因子：
9.9
通讯作者：
Y. Urushigawa
中科院分区：
文献类型：
--
作者：
N. Kanazawa;K. Urano;Naohiro Kokado;Y. Urushigawa
分析了丙酸和苯甲酸在阴离子交换树脂上的吸附行为，提出了羧酸的吸附平衡方程。认为羧酸在阴离子交换树脂上的吸附是分子的物理吸附和离子的离子交换吸附的总和，两者相互独立。羧酸的物理吸附符合Freundlich方程。对于羧酸根离子的离子交换吸附，平衡方程对应的浓度和pH值的宽范围内的实验结果。该方程包含一个选择性系数S（A）（Cl）的氯离子与羧酸根离子，这被认为是基本上是一个常数。从空气中的二氧化碳的碳酸氢根离子的流入也可以表示为额外的平衡方程与氯离子对碳酸氢根离子的选择性系数S（HCO（3））（Cl）。因此，吸附平衡方程可以估计平衡吸附量。即使是共存的碳酸氢根离子的影响是无关紧要的，当Freundlich等温方程的参数和羧酸根离子和碳酸氢根离子在每种树脂中的选择性系数是预先确定的。版权所有2001学术出版社。
The adsorption of propionic acid and benzoic acid on anion-exchange resins was analyzed, and an adsorption equilibrium equation of carboxylic acids was proposed. The adsorption of carboxylic acids on the anion-exchange resins was considered to be the sum of the physical adsorption of the molecule and the ion-exchange adsorption of the ion, which were independent of each other. For the physical adsorption of carboxylic acids, it was conformed to the Freundlich equation. For the ion-exchange adsorption of carboxylate ions, the equilibrium equation corresponded well with the experimental results for wide ranges of concentration and pH. The equation contains a selectivity coefficient S(A)(Cl) for the chloride ion versus the carboxylate ion, which was considered essentially a constant. The influent of the bicarbonate ion from carbon dioxide in air could also be expressed by the additional equilibrium equation with the selectivity coefficient S(HCO(3))(Cl) for the chloride ion versus the bicarbonate ion. Consequently, an adsorption equilibrium equation can estimate the equilibrium adsorption amounts. Even the effect of a coexisting bicarbonate ion is inconsequential when the parameters of the Freundlich isotherm equation and the selectivity coefficients of the carboxylate ion and the bicarbonate ion in each resin are determined in advance. Copyright 2001 Academic Press.