title: Photoreactivity of unfunctionalized single-wall carbon nanotubes involving hydroxyl radical: chiral dependency and surface coating effect.
abstract: Single-wall carbon nanotubes (SWCNTs) have a variety of potential and demonstrated applications, and their production rates are increasing rapidly. This increase in production has motivated research on their transport and potential transformation and their toxicity in the environment. In this work, we examined the direct and indirect photoreactivity of SWCNTs under sunlight conditions. We found that the direct photoreactivity of pristine SWCNTs is generally low; however, indirect photoreaction involving ·OH may be significant in natural aquatic environments. Environmental photochemical reactions generating ·OH lead to distinct changes in SWCNT fluorescence efficiency in the near-infrared (NIR) region, Raman spectra, and light attenuation spectra in the UV, visible, and NIR regions, indicating that covalent functionalization of SWCNTs occurs. The reactivity of SWCNTs to ·OH is dependent on the specific chiral structure of the SWCNTs and the surfactant associated with it. An operationally defined second-order rate constant (based on the decrease in NIR fluorescence signals) for all SWCNT chiral species reacting with ·OH was estimated to be (2.91 ± 1.30) × 10(10) M(-1 )s(-1). Our work suggests that photochemical reactions may be a significant transformation pathway of SWCNTs in aquatic systems.
authors.affiliation: National Exposure Research Laboratory, Ecosystems Research Division, U.S. Environmental Protection Agency , Athens, Georgia 30605, United States.
authors.forename: Wen-Che
authors.initials: WC
authors.lastname: Hou
authors.forename: Somayeh
authors.initials: S
authors.lastname: Beigzadehmilani
authors.forename: Chad T
authors.initials: CT
authors.lastname: Jafvert
authors.forename: Richard G
authors.initials: RG
authors.lastname: Zepp
mesh_terms: D004777:Environment; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000737:chemistry*; D008027:Light; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000528:radiation effects*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D019265:Spectroscopy, Near-Infrared; D013499:Surface Properties; D013997:Time Factors
chemical_list: D037742:Nanotubes, Carbon; D017665:Hydroxyl Radical