Premium
Design and Performance Evaluation of Hybrid Nanofiltration Membranes Based on Multiwalled Carbon Nanotubes and Polyelectrolyte Multilayers for Larger Ion Rejection and Separation
Author(s) -
Irigoyen Joseba,
Laakso Timo,
Politakos Nikolaos,
Dahne Lars,
Pihlajamäki Artho,
Mänttäri Mika,
Moya Sergio Enrique
Publication year - 2016
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201500433
Subject(s) - polyelectrolyte , nanofiltration , membrane , chemical engineering , materials science , allylamine , layer by layer , carbon nanotube , polysulfone , polymer chemistry , layer (electronics) , nanotechnology , chemistry , composite material , polymer , biochemistry , engineering
A polyelectrolyte multilayer (PEM) membrane of poly(diallyldimethylammonium chloride) (PDADMAC) and poly(sodium 4‐styrenesulfonate) (PSS) is deposited on top of a thick‐layer micrometer range of multiwalled carbon nanotubes (MWCNTs) assembled on a porous silicon carbide (SiC) tubular membrane support. MWCNTs are assembled “layer‐by‐layer” alternating oxidized CNTs and poly(allylamine hydrochloride)‐modified CNTs. The MWCNTs layer is crosslinked by annealing after the assembly. The MWCNT layer acts as a spacer between the PDADMAC/PSS PEM and the SiC support. The MWCNT support increases water permeability in 42% compared with the PEMs deposited without MWCNTs. Hybrid MWCNT–PEM membranes show high rejection for divalent ions, which increases directly with flux. A rejection up to 92% is measured for MgSO 4 and there is up to a 60% rejection difference between MgCl 2 and NaCl, making the hybrid MWCNT–PEMs highly appealing for nanofiltration and monovalent and divalent ion separations