High-performance reverse osmosis CNT/polyamide nanocomposite membrane by controlled interfacial interactions

Hee Joong Kim, Kwonyong Choi, Youngbin Baek, Dong Gyun Kim, Jimin Shim, Jeyong Yoon, Jong Chan Lee

Research output: Contribution to journalArticlepeer-review

176 Scopus citations

Abstract

Polyamide reverse osmosis (RO) membranes with carbon nanotubes (CNTs) are prepared by interfacial polymerization using trimesoyl chloride (TMC) solutions in n-hexane and aqueous solutions of m-phenylenediamine (MPD) containing functionalized CNTs. The functionalized CNTs are prepared by the reactions of pristine CNTs with acid mixture (sulfuric acid and nitric acid of 3:1 volume ratio) by varying amounts of acid, reaction temperature, and reaction time. CNTs prepared by an optimized reaction condition are found to be well-dispersed in the polyamide layer, which is confirmed from atomic force microscopy, scanning electron microscopy, and Raman spectroscopy studies. The polyamide RO membranes containing well-dispersed CNTs exhibit larger water flux values than polyamide membrane prepared without any CNTs, although the salt rejection values of these membranes are close. Furthermore, the durability and chemical resistance against NaCl solutions of the membranes containing CNTs are found to be improved compared with those of the membrane without CNTs. The high membrane performance (high water flux and salt rejection) and the improved stability of the polyamide membranes containing CNTs are ascribed to the hydrophobic nanochannels of CNTs and well-dispersed states in the polyamide layers formed through the interactions between CNTs and polyamide in the active layers.

Original languageEnglish (US)
Pages (from-to)2819-2829
Number of pages11
JournalACS Applied Materials and Interfaces
Volume6
Issue number4
DOIs
StatePublished - Feb 26 2014

Keywords

  • carbon nanotubes
  • high water flux
  • interfacial interactions
  • membranes
  • water purification

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