Interaction mechanism between multi-layered MoS2 and H2O2 for self-generation of reactive oxygen species.

Interaction mechanism between multi-layered MoS2 and H2O2 for self-generation of reactive oxygen species. Environ Res. 2020 Sep 17;:110227 Authors: Li Q, Hu B, Yang Q, Cai X, Nie M, Jin Y, Zhou L, Xu Y, Pan Q, Fang L Abstract Elucidating the generation mechanism of reactive oxygen species (ROS) is essential for advanced oxidation processes with respect to environmental and biological sciences. Herein, self-generation of ROS such as hydroxyl radicals (·OH), superoxide radicals (O2•-) and singlet oxygen (1O2) from the interaction between multi-layered flowerlike MoS2 nanosheets and H2O2 is presented. The results demonstrate that H2O2 can exfoliate multi-layered MoS2 into quantum dots and promote a 2H to 1T phase change accompanied by the dissolution of MoS2 to produce H+, MoO42- and SO42-. Electron spin resonance (ESR) spectroscopy confirm the production of ·OH, superoxide radicals O2•- and 1O2 in the MoS2/H2O2 system. The calculation data based on density functional theory (DFT) indicate that the 1T-MoS2 can lower the free energy profiles for stepwise catalytic decomposition of H2O2 to produce ROS as compared to 2H-MoS2. PMID: 32950516 [PubMed - as supplied by publisher]
Source: Environmental Research - Category: Environmental Health Authors: Tags: Environ Res Source Type: research