Selective oxidative degradation of organic pollutants by singlet oxygen-mediated photosensitization: Tin porphyrin versus C60 aminofullerene systems

Heechan Kim, Wooyul Kim, Yuri MacKeyev, Gi Seon Lee, Hee Joon Kim, Takashi Tachikawa, Seokwon Hong, Sang-Hyup Lee, Jungbae Kim, Lon J. Wilson, Tetsuro Majima, Pedro J J Alvarez, Wonyong Choi, Jaesang Lee

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

This study evaluates the potential application of tin porphyrin- and C 60 aminofullerene-derivatized silica (SnP/silica and aminoC 60/silica) as 1O2 generating systems for photochemical degradation of organic pollutants. Photosensitized 1O2 production with SnP/silica, which was faster than with aminoC60/silica, effectively oxidized a variety of pharmaceuticals. Significant degradation of pharmaceuticals in the presence of the 400-nm UV cutoff filter corroborated visible light activation of both photosensitizers. Whereas the efficacy of aminoC60/silica for 1O2 production drastically decreased under irradiation with λ > 550 nm, Q-band absorption caused negligible loss of the photosensitizing activity of SnP/silica in the long wavelength region. Faster destruction of phenolates by SnP/silica and aminoC60/silica under alkaline pH conditions further implicated 1O2 involvement in the oxidative degradation. Direct charge transfer mediated by SnP, which was inferred from nanosecond laser flash photolysis, induced significant degradation of neutral phenols under high power light irradiation. Self-sensitized destruction caused gradual activity loss of SnP/silica in reuse tests unlike aminoC60/silica. The kinetic comparison of SnP/silica and TiO2 photocatalyst in real wastewater effluents showed that photosensitized singlet oxygenation of pharmaceuticals was still efficiently achieved in the presence of background organic matters, while significant interference was observed for photocatalyzed oxidation involving non-selective OH radical.

Original languageEnglish
Pages (from-to)9606-9613
Number of pages8
JournalEnvironmental Science and Technology
Volume46
Issue number17
DOIs
Publication statusPublished - 2012 Sep 4

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Fingerprint Dive into the research topics of 'Selective oxidative degradation of organic pollutants by singlet oxygen-mediated photosensitization: Tin porphyrin versus C<sub>60</sub> aminofullerene systems'. Together they form a unique fingerprint.

  • Cite this

    Kim, H., Kim, W., MacKeyev, Y., Lee, G. S., Kim, H. J., Tachikawa, T., Hong, S., Lee, S-H., Kim, J., Wilson, L. J., Majima, T., Alvarez, P. J. J., Choi, W., & Lee, J. (2012). Selective oxidative degradation of organic pollutants by singlet oxygen-mediated photosensitization: Tin porphyrin versus C60 aminofullerene systems. Environmental Science and Technology, 46(17), 9606-9613. https://doi.org/10.1021/es301775k