Journal article
Mechanism of C-60 photoreactivity in water: Fate of triplet state and radical anion and production of reactive oxygen species
Environmental science & technology, v 42(9), pp 3459-3464
01 May 2008
PMID: 18522134
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The mechanism involved with (1) energy and electron transfer by C-60 in the aqueous phase during UV irradiation and (2) subsequent production of reactive oxygen species (ROS) such as singlet oxygen and superoxide radical anion was investigated. Electron paramagnetic resonance (EPR) study showed that C-60 embedded in micelles of nonionic surfactant (Triton X 100) or anionic surfactant (sodium dodecylbenzenesulfonate) produced ROS, but aggregated C-60 did not, consistent with our earlier findings made using indicator chemicals. Nanosecond and ferntosecond laser flash photolysis showed that the aggregation of C-60 significantly accelerates the decay of excited triplet state C-60, which is a key intermediate for energy and electron transfer, thus blocking the pathway for ROS production. This finding suggests that C-60 clusters will not contribute to oxidative damage or redox reactions in natural environment and biological systems in the same way molecular C(6)0 in organic phase reportedly does. In contrast, C-60 embedded in surfactant micelles produces ROS and the evidence is presented for the formation Of C-60 radical anion as an intermediate.
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Details
- Title
- Mechanism of C-60 photoreactivity in water: Fate of triplet state and radical anion and production of reactive oxygen species
- Creators
- Jaesang Lee - Georgia Institute of TechnologyYoko Yamakoshi - Georgia Institute of TechnologyJoseph B. Hughes - Georgia Institute of TechnologyJae-Hong Kim - Georgia Institute of Technology
- Publication Details
- Environmental science & technology, v 42(9), pp 3459-3464
- Publisher
- Amer Chemical Soc
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Civil, Architectural, and Environmental Engineering
- Web of Science ID
- WOS:000255444100059
- Scopus ID
- 2-s2.0-52049105659
- Other Identifier
- 991021931902404721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences