Reactivity of graphene oxide with reactive oxygen species (hydroxyl radical, singlet oxygen, and superoxide anion).

ABSTRACT: Increases in the production and applications of graphene oxide (GO), coupled with reports of its toxic effects, are raising concerns about its health and ecological risks. To better understand GO's fate and transport in aquatic environments, we investigated its reactivity with three major reactive oxygen species (ROS): HO˙, ¹O₂, and O₂˙^-. Second-order degradation rate constants were calculated on the loss of dissolved organic carbon (DOC) and steady-state concentration of individual ROS species. Absolute second-order rate constants were determined by competition kinetics to be 6.24 × 10⁴, 8.65 × 10², and 0.108 mg-C^-1 L s^-1 for HO˙, ¹O₂, and O₂˙^-, respectively.

SUBMITTER: Hsieh HS 

PROVIDER: S-EPMC7098813 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature