A carbon nanotube wall membrane for water treatment

Byeongho Lee, Youngbin Baek, Minwoo Lee, Dae Hong Jeong, Hong H. Lee (), Jeyong Yoon () and Yong Hyup Kim ()
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Byeongho Lee: School of Mechanical and Aerospace Engineering, Seoul National University
Youngbin Baek: School of Chemical and Biological Engineering, Seoul National University, Institute of Chemical Processes (ICP)
Minwoo Lee: Seoul National University
Dae Hong Jeong: Seoul National University
Hong H. Lee: School of Chemical and Biological Engineering, Seoul National University, Institute of Chemical Processes (ICP)
Jeyong Yoon: School of Chemical and Biological Engineering, Seoul National University, Institute of Chemical Processes (ICP)
Yong Hyup Kim: School of Mechanical and Aerospace Engineering, Seoul National University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Various forms of carbon nanotubes have been utilized in water treatment applications. The unique characteristics of carbon nanotubes, however, have not been fully exploited for such applications. Here we exploit the characteristics and corresponding attributes of carbon nanotubes to develop a millimetre-thick ultrafiltration membrane that can provide a water permeability that approaches 30,000 l m−2 h−1 bar−1, compared with the best water permeability of 2,400 l m−2 h−1 bar−1 reported for carbon nanotube membranes. The developed membrane consists only of vertically aligned carbon nanotube walls that provide 6-nm-wide inner pores and 7-nm-wide outer pores that form between the walls of the carbon nanotubes when the carbon nanotube forest is densified. The experimental results reveal that the permeance increases as the pore size decreases. The carbon nanotube walls of the membrane are observed to impede bacterial adhesion and resist biofilm formation.

Date: 2015
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DOI: 10.1038/ncomms8109

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