强酸性阳离子交换纤维吸附铟的热力学

Thermodynamic of adsorption of indium on strong acidic cationic exchange fiber

采用自制强酸性阳离子交换纤维对水溶液中In3＋的吸附特性进行研究，在温度为293-323K和研究的浓度范围内，强酸性阳离子交换纤维对In3＋吸附平衡数据采用Langmuir、Dubini-Radushkevieh（D-R）、Freundlich、Temkin、Redlich-Peterson（R-P）和Koble-Corrigan（K-C）等6种等温吸附模型，对在不同温度下SACEF吸附In计的等温实验数据进行线性和非线性拟合。结果表明：除Langmuir非线性拟合及Dubini—Radushkevieh模型之外，其余模型的线性及非线性拟合结果均较好，可以用于描述强酸性阳离子交换纤维吸附水中In3＋的等温吸附行为，相关系数R2值都在0．9左右。综合考虑相关系数来看，Langmuir模型（线性拟合）最为适合。等量吸附焓表明：强酸性阳离子交换纤维对In3＋吸附是吸热过程，水合In3-离子在强酸性阳离子交换纤维上的吸附焓大于0，是一个吸热、自发和熵增的过程，并对吸附行为进行了合理解释。

Adsorption of In3＋ from aqueous solution by strong acid cationic exchange fiber （SACEF） was studied using batch experiments. Langmuir, Dubinin-Radushkevich （D-R）, Freundlich, Temkin, Redlich-Peterson（R-P）and Koble-Corrigan （K-C） models were applied to analyze the adsorption equilibrium data of In3＋ on SACEF obtained with researching range of concentration at 293-323 K through linear fitting and nonlinear fitting methods. The results show that, except for Langmuir nonlinear fitting and Dubini-Radushkevieh models, the adsorption equilibrium data can be well interpreted by both the linear fitting and nonlinear fitting of the models with the R2 values about 0.9. Out of all the models, Langmuir linear fitting model is the suitable model with highest linear fitting R2 value. The value of isosteric enthalpy indicates that the endothermic nature of the adsorption of In3＋ on SACEF. The adsorption of In3＋ on SACEF is an endothermic, spontaneous and entropy increase process with △H〉0 and reasonable explanation is given to the adsorption behavior.