膜
化学工程
聚偏氟乙烯
乳状液
水溶液中的金属离子
超亲水性
膜污染
材料科学
膜技术
化学
结垢
色谱法
金属
有机化学
工程类
润湿
生物化学
作者
Xuanting He,Xiaohui Liu,Jiaxiang Liu,Boyu Li,Huachen Liu,Wen‐Quan Tao,Xiaoxiang Xu,Zhuo Li
出处
期刊:Desalination
[Elsevier]
日期:2023-10-10
卷期号:569: 117047-117047
被引量:18
标识
DOI:10.1016/j.desal.2023.117047
摘要
Complex multi-component pollutant-oil-water emulsions have caused serious environmental problems and increased the difficulty of purification treatment in the last few decades. The membrane based on two-dimensional (2D) materials can rationally control the interlayer distance, thus improved the separation performance of the membrane for complex wastewater. We herein reported a composite membrane, in which 2D metal-organic frameworks (MOFs) Co-CAT-1 with super-hydrophilicity cross-linked by polyethylene imine (PEI) was integrated into graphene oxide (GO) and then coated on polyvinylidene fluoride (PVDF) membrane (CPG membrane). The CPG membrane exhibited highly efficient in separating oil-water (including crude oil) emulsions, achieving a flux of 219 L∙m−2∙h−1∙bar−1 and a separation efficiency of 99.2 %. Moreover, the separation efficiency for complex emulsions after several cycles was maintained >99 % for dyes and 76 % for heavy metal ions (Ni2+, Pb2+, Zn2+). The remarkable fouling resistance and reusability of CPG membrane in purifying complex oil-in-water emulsions can be attributed to their internal cross-linking, electrostatic interactions, hydrogen bonding attraction, and π-π stacking. Molecular dynamics simulations were employed for in-depth studies on the separation processes of dye- and heavy metal ions-emulsions, revealing the mechanisms of mass transfer within the membrane. This work aims to construct stable and multifunctional membranes for separating pollutant-oil-water emulsions with multi-component.
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