Theoretical and Experimental Investigation on the Moisture Sorption Kinetics of a PVA/LiCl Composite Membrane in a Dynamic Humidity Environment

Langmuir : the ACS Journal of Surfaces and Colloids
Kai Xu, Hong Ye

Abstract

The PVA/LiCl composite membrane is an important material with a selective permeation to moisture. In this study, the sorption kinetics characteristics of the PVA/LiCl composite membrane are investigated in a dynamic humidity environment. The sorption kinetics curves of the PVA/LiCl composite membranes with different LiCl contents were measured in the range from 10 to 90% relative humidity, and the kinetics characteristics of the sorption components of the total moisture uptake were analyzed with a triple-mode sorption model. The results show that the process of pooling adsorption occurs only when the amount of Henry absorption exceeds a threshold. With the increase in LiCl content, the threshold gradually decreases, indicating that introducing LiCl in the membrane mainly affects the process of pooling adsorption. In the desorption part of the kinetics curve, the amounts of Henry absorption and pooling adsorption gradually decrease, while the moisture adsorbed by the hydrophilic hydroxyls, i.e., the amount of Langmuir adsorption, is still largely retained in the membrane, resulting in the water-retaining performance in a low-humidity environment. It is noteworthy that in a high-humidity environment, the amounts of Henry absorpti...Continue Reading

References

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May 14, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Stephen J HarleyRobert S Maxwell
Aug 15, 2015·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yunwei SunElizabeth A Glascoe
Jun 9, 2017·Scientific Reports·Hom N SharmaElizabeth A Glascoe
Nov 18, 2018·Scientific Reports·Hom N SharmaElizabeth A Glascoe
Aug 1, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Tsukasa MiyazakiKeiji Tanaka
Mar 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Tsukasa MiyazakiKeiji Tanaka

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