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

Title
Selective oxidative degradation of organic pollutants by singlet oxygen-mediated photosensitization: Tin porphyrin versus C60 aminofullerene system
Authors
김희찬김우열Yuri Mackeyev이지선김희준Takashi Tachikawa홍석원이상협김중배Lon J. WilsonTetsuro MajimaPedro J. J. Alvarez최원용이재상
Keywords
photosensitizing agents; singlet oxygenation; direct charge tranfer; visible light activity; target specificity
Issue Date
2012-09
Publisher
Environmental science & technology
Citation
VOL 46, NO 17, 9606-9613
Abstract
This study evaluates the potential application of tin porphyrin- and C60 aminofullerene-derivatized silica (SnP/silica and aminoC60/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.
URI
http://pubs.kist.re.kr/handle/201004/42890
ISSN
0013936X
Appears in Collections:
KIST Publication > Article
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