PCTFE Microporous Membrane with High Corrosion-resistance and Ultra-fast Oil/water Separation Performances

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Lu He, Jingxian Qin, Wanli Zhang, Weiwei Zhu, Jiang Li, Shaoyun Guo, Jiabin Shen
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Abstract

Membrane separation technology is a promising choice for treating oily water from industrial and domestic sewage. The elaborate design of pore structure can realize a good trade-off between separation flux and efficiency, thus taking the full advantages of membrane separation. Herein, polychlorotrifluoroethylene (PCTFE) microporous membrane with tunable pore structure was fabricated via a sacrificial template method. Fluoroelastomer (FR), serving as sacrificial template, was incorporated into PCTFE via a solvent-assisted method, forming PCTFE/FR blending films. After removing FR via solvent-dissolving, porous PCTFE membrane was obtained. More important, the gradual increment of FR loading made the morphology of PCTFE/FR blending films realize the transformation from “sea-island” to bicontinuous structure, thus endowing the membranes with tunable pore structure, surface wettability, as well as mechanical properties. Among the candidates, 50FR membranes possessed good flexibility, twist-resistance, as well as excellent creep-resistance and can efficiently separate oil from various water/oil mixtures. The oil (dichloromethane) permeability, separation efficiency, and filtrated oil purity were high up ∼10000 L/(m2⋅h), ∼99%, and ∼99.92 wt%, respectively. Additionally, although undergoing 25 separation cycles or being immersed into various highly-corrosive liquid (including 1M HCl, 1M NaOH, DMF, ethanediamine, and concentrated HNO3) for 7 days, the properties of the membrane changed little. These features suggested a great potential for preparing PCTFE membranes used for oil/water separation in various harsh environment.

Abstract Image

具有高耐腐蚀性和超快油水分离性能的 PCTFE 微孔膜
膜分离技术是处理工业和生活污水中含油水的一种很有前途的选择。对孔隙结构的精心设计可以在分离通量和分离效率之间实现良好的权衡,从而充分发挥膜分离的优势。本文通过牺牲模板法制备了孔结构可调的聚三氟氯乙烯(PCTFE)微孔膜。作为牺牲模板的氟橡胶(FR)通过溶剂辅助法与 PCTFE 结合,形成 PCTFE/FR 混合膜。通过溶剂溶解去除 FR 后,得到多孔 PCTFE 膜。更重要的是,随着 FR 负载的逐渐增加,PCTFE/FR 混合膜的形态实现了从 "海岛 "到双连续结构的转变,从而使膜具有可调的孔隙结构、表面润湿性和机械性能。其中,50FR 膜具有良好的柔韧性、抗扭曲性和优异的抗蠕变性,可从各种水/油混合物中有效分离油。油(二氯甲烷)渗透率、分离效率和滤油纯度分别高达 ∼10000 L/(m2-h)、∼99% 和 ∼99.92 wt%。此外,尽管经历了 25 次分离循环或在各种高腐蚀性液体(包括 1M HCl、1M NaOH、DMF、乙二胺和浓 HNO3)中浸泡 7 天,膜的性能变化不大。这些特点表明,制备在各种恶劣环境中用于油/水分离的 PCTFE 膜具有很大的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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