基质聚合物功能化碳纳米管在渗透蒸发脱盐聚合物膜上的水渗透途径的建立

IF 4.9 Q1 ENGINEERING, CHEMICAL
Cheng Tseng, Ying-Ling Liu
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引用次数: 6

摘要

膜渗透蒸发脱盐是一种有效的淡水资源化和废盐水处理技术。膜法脱盐既要考虑渗透通量,又要考虑排盐率。在本研究中,利用基质聚合物功能化碳纳米管在渗透蒸发脱盐膜中建立水渗透通道,有效地提高了渗透蒸发脱盐膜的水渗透通量。以聚乙烯醇(PVA)为基质聚合物制备膜时,少量PVA功能化CNTs (0.06 wt%)可有效地将PVA膜的水通量从1,630 gm−2h−1提高到6,140 gm−2h−1(进料溶液:3.5 wt% NaCl(aq), 25°C),而不牺牲盐的析出,相当于水通量增加了3.77倍。该膜也适用于浓盐水溶液(15 wt% NaCl(aq))。该方法具有应用于其他聚合物膜渗透汽化分离的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Creation of water-permeation pathways with matrix-polymer functionalized carbon nanotubes in polymeric membranes for pervaporation desalination

Membrane-based pervaporation desalination is an effective process for freshwater resource and treatments on waste brines. Both water permeation fluxes and salt rejection are concerned for the membrane-based desalination. In this work an effective approach to increase the water permeation fluxes of the pervaporation desalination membranes has been demonstrated through utilization of matrix-polymer functionalized carbon nanotubes in creation of water permeation pathways in the membranes. With poly(vinyl alcohol) (PVA) as the matrix polymer for membrane fabrication, a small amount of PVA-functionalized CNTs (0.06 wt%) effectively increases the water permeation fluxes of the PVA membranes from 1,630 to 6,140 gm−2h−1 (feeding solution: 3.5 wt% NaCl(aq) at 25 °C) without sacrifice of salt rejection, corresponding to a 3.77-times of increase in water permeation flux. The membrane is also workable on concentrated salt aqueous solution (15 wt% NaCl(aq)). The approach has the potential to be employed to other polymer membranes for pervaporation separation.

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