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Photoinduced superwetting single-walled carbon nanotube/TiO(2) ultrathin network films for ultrafast separation of oil-in-water emulsions.

Authors
  • Gao, Shou Jian
  • Shi, Zhun
  • Zhang, Wen Bin
  • Zhang, Feng
  • Jin, Jian
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
Jun 24, 2014
Volume
8
Issue
6
Pages
6344–6352
Identifiers
DOI: 10.1021/nn501851a
PMID: 24869793
Source
Medline
License
Unknown

Abstract

A SWCNT/TiO2 nanocomposite ultrathin film that has superhydrophilic and underwater superoleophobic properties after UV-light irradiation is successfully prepared by coating TiO2 via the sol-gel process onto an SWCNT ultrathin network film. The robust and flexible SWCNT/TiO2 nanocomposite films with a thickness and pore size of tens of nanometers can separate both surfactant-free and surfactant-stabilized oil-in-water emulsions in an ultrafast manner with fluxes up to 30 000 L m(-2) h(-1) bar(-1), which is 2 orders of magnitude higher than commercial filtration membranes with similar separation performance, and with high separation efficiency. Most importantly, the films exhibit excellent antifouling and self-cleaning performance during multiple cycles with the aid of the photocatalytic property of TiO2 nanoparticles. This work provides a route for designing ultrathin and superwetting films for effective separation of oil-in-water emulsions. The SWCNT/TiO2 ultrathin film is potentially useful in treating emulsified wastewater produced in industry and daily life and for purification of crude oil and fuel.

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