Journal article
Transformation of Aggregate C-60 in the Aqueous Phase by UV Irradiation
Environmental science & technology, v 43(13), pp 4878-4883
01 Jul 2009
PMID: 19673279
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
This study demonstrates that water-stable C-60 cluster (nC(60)) undergoes a photochemical transformation(s) when irradiated with monochromatic UV light at 254 nm. Upon UV exposure, characteristic absorption of nC(60) in the visible (ca. 450-550 nm, indicative of a cluster structure) and UV regions,(indicative of underivatized molecular C-60) gradually disappeared. Concurrently, a new product with absorption centered at 210 nm formed. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) analyses confirmed a complete reduction in aggregation and formation of a soluble product. Negligible loss of total organic carbon (TOC) and drastic. retardation in degradation kinetics in the absence of oxygen collectively implied that photochemical transformation was accomplished via oxidative pathway without carbon mineralization. MS (LDI), FTIR, and XPS analyses indicated a 60 carbon cage product, containing various oxygen functional groups such as epoxides and ethers. In addition, this product demonstrated,significantly less antibacterial effects on Escherichia coli when compared to the parent nC(60). The results of this study suggest that accurate assessment of C-60 in environmental life cycles and impact should consider the light-mediated transformation of C-60 in the aqueous phase and resulting water-soluble products,
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Details
- Title
- Transformation of Aggregate C-60 in the Aqueous Phase by UV Irradiation
- Creators
- Jaesang Lee - Rice UniversityMin Cho - Georgia Institute of TechnologyJohn D. Fortner - Rice UniversityJoseph B. Hughes - Georgia Institute of TechnologyJae-Hong Kim - Georgia Institute of Technology
- Publication Details
- Environmental science & technology, v 43(13), pp 4878-4883
- 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:000267435500041
- Scopus ID
- 2-s2.0-67649965229
- Other Identifier
- 991021931768104721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences