Rapid Communication in Photoscience

Korean Society of Photoscience (한국광과학회)
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Visible light-induced reduction of Cr(VI) in cationic micelle solution

  • Kyung, Hyunsook (School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Cho, Young-Jin (School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH)) ;
  • Choi, Wonyong (School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH))
  • Received : 2015.09.12
  • Accepted : 2015.09.20
  • Published : 2015.09.30
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Abstract

Cr(VI) reduction was successfully achieved in the presence of cationic micelles (CMs) under visible light illumination. Micelle formation of cationic surfactants seems to be critical in Cr(VI) reduction. Cr(VI) was reduced very fast above the critical micelle concentration (cmc) of CTAB solutions, but was not reduced at all either below or around the cmc of CTAB. The reduction rate of Cr(VI) was enhanced in the absence of dissolved oxygen, supporting that the removal of Cr(VI) should be achieved via a reductive pathway. When CTAB was substituted by Brij 35 or SDS, the reduction of Cr(VI) was negligible. This indicates that the electrostatic interaction between Cr(VI) and headgroups of surfactants is important in the visible light-induced Cr(VI) reduction in micellar solutions.

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References

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