Idarraga-Mora Jaime A, Lemelin Michael A, Weinman Steven T, Husson Scott M
Department of Chemical and Biomolecular Engineering, Clemson University, 127 Earle Hall, Clemson, SC 29634, USA.
Department of Chemical and Biological Engineering, The University of Alabama, Box 870203, Tuscaloosa, AL 35487, USA.
Membranes (Basel). 2019 Jul 26;9(8):92. doi: 10.3390/membranes9080092.
In this paper, we discuss the effect of alcohol contact on the transport properties of thin-film composite reverse osmosis membranes. Five commercial membranes were studied to quantify the changes in water permeance and sodium chloride rejection from contact with five C1-C4 monohydric, linear alcohols. Water permeance generally increased without decreasing rejection after short-term contact. The extent of these changes depends on the membrane and alcohol used. Young's modulus measurements showed decreased stiffness of the active layer after contacting the membranes with alcohol, suggesting plasticization. Data analysis using a dual-mode sorption model identified positive correlations of the initial water permeance, as well as the change in free energy of mixing between water and the alcohols, with the increase in water permeance after alcohol contact. We suggest that the mixing of water with the alcohols facilitates alcohol penetration into the active layer, likely by disrupting inter-chain hydrogen bonds, thus increasing the free volume for water permeation. Our studies provide a modeling framework to estimate the changes in transport properties after short-term contact with C1-C4 alcohols.
在本文中，我们讨论了酒精接触对复合薄膜反渗透膜传输性能的影响。研究了五种商用膜，以量化与五种C1 - C4一元线性醇接触后水通量和氯化钠截留率的变化。短期接触后，水通量通常会增加，而截留率不会降低。这些变化的程度取决于所使用的膜和醇类。杨氏模量测量表明，膜与醇接触后活性层的刚度降低，表明发生了塑化。使用双模吸附模型进行的数据分析表明，初始水通量以及水与醇类混合自由能的变化与醇接触后水通量的增加呈正相关。我们认为，水与醇类的混合促进了醇类渗透到活性层中，可能是通过破坏链间氢键，从而增加了水渗透的自由体积。我们的研究提供了一个建模框架，以估计与C1 - C4醇类短期接触后传输性能的变化。
