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利用等压法对308.15 K下NiCl2-NH4Cl-H2O体系的热力学研究及离子相互作用模型

发表时间:2016-07-15  浏览量:5387  下载量:2757
全部作者: 江冰川,刘士军,丁治英,张维丽
作者单位: 中南大学化学化工学院
摘 要: 采用等压法测定308.15 K时,浓度范围为0.045 3~4.948 8 mol•kg−1的NiCl2-H2O体系和离子强度为0.216 6~6.316 9 mol•kg−1的NiCl2-NH4Cl-H2O体系的等压平衡浓度,通过热力学计算得到了不同浓度下溶液体系的渗透系数、水活度以及渗透系数随离子强度的变化规律。采用Pitzer离子相互作用模型对实验结果进行参数化研究,拟合获得了NiCl2-NH4Cl-H2O体系及其子体系NiCl2-H2O的离子相互作用参数,计算了NiCl2在该溶液体系中的平均活度系数;拟合得到了NiCl2-H2O溶液的纯盐参数β(0)、β(1)和Сφ分别为0.386 0、1.269 2、 −0.054 2. NiCl2-NH4Cl-H2O体系的混盐参数θNiNH4、ψNiNH4Cl分别为−0.026 0、−0.023 1. Pitzer模型拟合得 到的渗透系数与实验所得结果相吻合。
关 键 词: 物理化学;等压法;Pitzer模型;渗透系数;活度系数
Title: Isopiestic investigation and ion-interaction model of system NiCl2-NH4Cl-H2O at 308.15 K
Author: JIANG Bingchuan, LIU Shijun, DING Zhiying, ZHANG Weili
Organization: College of Chemistry and Chemical Engineering, Central South University
Abstract: The isopiestic equilibrium molalities of NiCl2-H2O system, the concentration of which ranges from 0.045 3-4.948 8 mol•kg−1, and the NiCl2-NH4Cl-H2O system, the ion strength of which ranges from 0.216 6-6.316 9 mol•kg−1 were determined by isopiestic at 308.15 K. The osmotic coefficient, water activity and the rule of the osmotic coefficient varying with ionic strength were obtained through thermodynamic calculation of solution systems at different concentrations. The experiment results were parametrically studied by the Pitzer ion-interaction model. The ion-interaction parameters of the NiCl2-NH4Cl-H2O system and the NiCl2-H2O system were obtained by multiple nonlinear regression. The average activity coefficients of NiCl2 were calculated in the system. The pure salt parameters β(0), β(1) and Сφ of NiCl2-H2O system were 0.386 0, 1.269 2 and −0.054 2. The parameters of the mixed salt θNiNH4, ψNiNH4Cl were −0.026 0, −0.023 1. The osmotic coefficients which obtained by fitting Pitzer model agreed well with the experiment results.
Key words: physical chemistry; isopiestic measurement; Pitzer model; osmotic coefficient; activity coefficient
发表期数: 2016年7月第13期
引用格式: 江冰川,刘士军,丁治英,等. 利用等压法对308.15 K下NiCl2-NH4Cl-H2O体系的热力学研究及离子相互作用模型[J]. 中国科技论文在线精品论文,2016,9(13):1345-1351.
 
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