TY - JOUR
T1 - Self-assembled superhydrophilic MOF-decorated membrane for highly efficient treatment and separation mechanism of multi-component emulsions
AU - He, Xuanting
AU - Liu, Xiaohui
AU - Liu, Jiaxiang
AU - Li, Boyu
AU - Liu, Huachen
AU - Tao, Wenquan
AU - Xu, Xiaoxiang
AU - Li, Zhuo
N1 - Publisher Copyright:
© 2023
PY - 2024/1/1
Y1 - 2024/1/1
N2 - 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.
AB - 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.
KW - Composite membrane
KW - Graphene oxide
KW - Metal-organic frameworks
KW - Molecular dynamics simulation
KW - Oil-water emulsion
UR - http://www.scopus.com/inward/record.url?scp=85173427447&partnerID=8YFLogxK
U2 - 10.1016/j.desal.2023.117047
DO - 10.1016/j.desal.2023.117047
M3 - Article
AN - SCOPUS:85173427447
SN - 0011-9164
VL - 569
JO - Desalination
JF - Desalination
M1 - 117047
ER -