Issue 1, 2022

High-permeability vacuum membrane distillation utilizing mechanically compressed carbon nanotube membranes

Abstract

Membranes for membrane distillation (MD) are mostly made of polymeric and ceramic materials. We demonstrate here that the laterally-compressed, vertically-aligned CNTs (VACNT) obtainable from a CNT forest are an excellent membrane material for vacuum membrane distillation (VMD). The VACNT structure provides interstices between CNTs for extracting vaporized water molecules, while efficiently filtering the impurity salts. The VACNT membrane is shown to deliver excellent performance when tested for the desalination of 3.5 wt% NaCl water solution, as exemplified by the permeability of 68 LMH (liter per square meter per hour) achieved at the salt rejection of over 99.8% at 65 °C. We also demonstrate that the VACNT membrane performance can be maintained with time with the aid of a simple cleaning procedure, which bodes well for a long lifetime of the membrane for VMD application.

Graphical abstract: High-permeability vacuum membrane distillation utilizing mechanically compressed carbon nanotube membranes

Supplementary files

Article information

Article type
Paper
Submitted
02 Nov 2021
Accepted
10 Dec 2021
First published
20 Dec 2021
This article is Open Access
Creative Commons BY license

RSC Adv., 2022,12, 201-206

High-permeability vacuum membrane distillation utilizing mechanically compressed carbon nanotube membranes

W. Jung, Y. Choe, T. Kim, J. G. Ok, H. H. Lee and Y. H. Kim, RSC Adv., 2022, 12, 201 DOI: 10.1039/D1RA08042C

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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