Water-soluble ozonated lignin as a hydrophilic modifier for poly(vinyl alcohol) membranes for pervaporation desalination

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Pub Date : 2023-11-05 DOI:10.1016/j.memsci.2023.121959

Chia-Yu Lai , Yi-Ming Sun , Ying-Ling Liu

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Abstract

Poly (vinyl alcohol) (PVA)-based membranes are widely applied to pervaporation desalination. Further modification of the PVA-based membranes with suitable additives is attractive for increasing the water permeation fluxes. In this work, water-soluble ozonated lignin (W_s-OL) was prepared and used as an additive for preparation of W_s-OL-modified PVA membranes, which showed relatively high surface hydrophilicity, reduced crystallinity, and small crystallite sizes compared to the neat PVA membrane. The W_s-OL modification brought a 2.1 times of water permeation flux to the PVA membrane in pervaporation desalination on a 3.5 wt% NaCl_(aq) solution at 25 °C. Under an optimum condition, the modified PVA membrane possessing 50 wt% W_s-OL and being crosslinked with 4-sulfophthalic acid (SPTA) exhibited a water permeation flux and a salt rejection of 78,630 g m^-2 h^-1 and 99.91%, respectively. The high efficiency of W_s-OL in modifying hydrophilic membranes is noteworthy and could be potentially applied to other membranes for pervaporation separation and oil-water separations.

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水溶性臭氧化木质素作为渗透蒸发脱盐用聚乙烯醇膜亲水性改性剂

聚乙烯醇(PVA)基膜广泛应用于渗透蒸发脱盐。用合适的添加剂对聚乙烯醇基膜进行进一步改性，对于提高水渗透通量是有吸引力的。本文制备了水溶性臭氧化木质素(Ws-OL)，并将其作为添加剂用于制备Ws-OL修饰的PVA膜，与纯PVA膜相比，该膜具有较高的表面亲水性，结晶度降低，晶粒尺寸小。Ws-OL改性后的PVA膜在3.5 wt% NaCl(aq)溶液中，在25°C下进行渗透蒸发脱盐，其渗透通量提高了2.1倍。在最佳条件下，Ws-OL含量为50%的改性PVA膜与4-磺化邻苯二甲酸(SPTA)交联后，膜的渗透通量为78,630 g m-2 h-1，除盐率为99.91%。Ws-OL对亲水性膜的高效改性是值得关注的，并有可能应用于其他膜的渗透蒸发分离和油水分离。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Membrane Science 工程技术-高分子科学

CiteScore

17.10

自引率

17.90%

发文量

1031

审稿时长

2.5 months

期刊介绍： The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.