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Effect of Porous and Nonporous Nanostructures on the Permeance of Positively Charged Nanofilm Composite Membranes
Author(s) -
Sarkar Pulak,
Modak Solagna,
Karan Santanu
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202000251
Subject(s) - permeance , nanofiltration , materials science , membrane , polyamide , interfacial polymerization , chemical engineering , thin film composite membrane , nanocomposite , layer (electronics) , composite number , carbon nanotube , graphene , nanotechnology , composite material , permeation , polymer , reverse osmosis , monomer , chemistry , biochemistry , engineering
Abstract The role of the nanostructured materials incorporated in the separation layer of thin‐film composite membranes is not properly understood yet, as it requires stringent salt rejection values, proper imaging of the separation layer to realize the presence of nanostructured materials, and to know the thickness of the separation layer. Here, the scalable fabrication of high flux positively charged “polyamide composite nanofiltration” membranes with an ultrathin nanofilm separation layer of ≈14 nm produced via interfacial polymerization of polyethyleneimine and trimesoyl chloride is presented. “Polyamide nanocomposite nanofiltration” membranes are fabricated with the incorporation of different porous and nonporous nanostructures (e.g., ZIF‐8, TiO 2, and Fe 2 O 3 nanoparticles, graphene oxide, multi‐walled carbon nanotube, etc.) within the nanofilm separation layer. High water permeance of 15.4 L m −2 h −1 bar −1 (an increase of 33.9% compared to the pure nanofilm) is achieved with high rejection of MgCl 2 (97.6%). Such membranes with enhanced water permeance surpass the upper bound of the permeance‐rejection of the state‐of‐the‐art positively charged nanofiltration membranes applicable for ionic and molecular separation.