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首页> 外文期刊>Russian Journal of Physical Chemistry >Kinetics of desorption of KCL from polyvinyl alcohol-borate hydrogel in aqueous-alcoholic solvents at different temperatures
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Kinetics of desorption of KCL from polyvinyl alcohol-borate hydrogel in aqueous-alcoholic solvents at different temperatures

机译：KCL在聚乙烯醇硼酸盐水凝胶中在不同温度下的解吸动力学

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摘要

Desorption kinetics of adsorbed KCl from Polyvinyl alcohol borate hydrogel was studied by conductivity method in aqueous system and aqueous binary solvent system using 50% aqueous-methanol, aqueous- ethanol and aqueous-propanol at different temperature ranging from 293 to 313 K. Desorption process follows pseudo first order and intra particle diffusion kinetics was analyzed on the basis of linear regression coefficient R (2) and chi square test chi(2) values. The process of desorption of KCl from hydrogel was favorable in aqueous system, the study reveals the fact that the polarity of solvent influenced the kinetics of desorption, on decrement of polarity of solvent rate, rate constant and intra particle rate constant decreases. Based on intra particle kinetic equation fitting it was concluded that desorption was initiated by removal of ions from surface of hydrogel later on ions interacted inside the cross linked unit was also become free. Temperature enhances the rate, rate constant and intra particle rate constant. Thermodynamic parameters attributed towards the fact that the process of desorption of KCl from hydrogel is non-spontaneous in nature.
机译：通过电导法研究了在50％甲醇，乙醇和丙醇水溶液中温度为293-313 K的水性体系和水性二元溶剂体系中聚乙烯醇硼酸盐水凝胶吸附KCl的解吸动力学。在线性回归系数R（2）和卡方检验chi（2）值的基础上分析了伪一级和内部粒子扩散动力学。在水体系中水凝胶中KCl的解吸过程是有利的，研究揭示了溶剂的极性影响解吸动力学的事实，随着溶剂速率极性的降低，速率常数和颗粒内速率常数的降低。基于粒子内动力学方程拟合，得出的结论是，脱附是通过从水凝胶表面去除离子开始的，随后交联单元内部相互作用的离子也变得游离。温度提高了速率，速率常数和颗粒内速率常数。热力学参数归因于以下事实：KCl从水凝胶中解吸的过程本质上是非自发的。

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