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    Cu-MOF-Polydopamine-Incorporated Functionalized Nanofiltration Membranes for Water Treatment: Effect of Surficial Adhesive Modification Techniques

    Year: 2021

    Journal: ACS ES&T Wat., Volume 1, FEB 12, page 430–439

    Authors: Parkerson, Zane Joseph; Le, Tin; Das, Parnab; Mahmoodi, S. Nima; Esfahani, Milad Rabbani

    Keywords: nanoporous polymer membrane; fabrication method; metal-organic framework; molecular dynamics; nanofiltration

    Nanofiltration (NF) membranes have been used for different applications in water treatment. In this work, we studied two facile surficial adhesive functionalization processes using polydopamine (pDA) and a metal-organic framework (MOFs) and investigated their individual and synergistic effects on membrane rejection, permeability, and antifouling properties. The copper MOF nanoparticles (Cu-MOF) were synthesized and incorporated with the pDA for surface coating of NF membranes using two different static (dip-coating) and dynamic (filtration-assisted) fabrication processes. All of the functionalized membranes were characterized completely, and the effects of pDA and Cu-MOF separately and together on the membrane physicochemical properties were identified. The results showed that the surface functionalization by only pDA enhanced the dye rejection from 22% (blank) to 98% (pDA-functionalized membrane). The dip-coating approach resulted in uniform polymerization of pDA on the membrane surface, while the filtration-assisted technique generated a deficient pDA layer. The incorporation of Cu-MOF into the pDA layer improved the permeability of the pDA-functionalized membrane by increasing the hydrophilicity of membranes and providing more water pathways due to the porous structure of MOFs. In addition, the molecular dynamics (MD) investigation of MOF-functionalized membranes revealed the role of embedded Cu-MOF charge repulsion mechanisms in the rejection of anionic and cationic dyes.
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