Enhanced desalination using carboxylated carbon nanotube immobilized membranes

Madhuleena Bhadra, Sagar Roy, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

In carbon nanotube immobilized membrane (CNIM), the nanotubes serve as a sorbent that provides additional pathways for solute transport. In this paper we present that carboxylated nanotubes which are significantly more polar and can increase interactions with the water vapor in CNIM to improve desalination efficiency in membrane distillation (MD). The encapsulation of the nanotubes in PVDF prevented the carboxylated nanotubes from making the overall membrane more hydrophilic and thus retain its performance. Overall, desalination was consistently better with carboxylated nanotubes than with unfunctionalized ones with flux reaching as high as 19.2 kg/m2 h in a sweep gas membrane distillation mode.

Original languageEnglish (US)
Pages (from-to)373-377
Number of pages5
JournalSeparation and Purification Technology
Volume120
DOIs
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Filtration and Separation

Keywords

  • Carbon nanotubes
  • Desalination
  • Membrane distillation
  • Membranes

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