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• W3018182040 endingPage "138335" @default.
• W3018182040 startingPage "138335" @default.
• W3018182040 abstract "In this study, the photochemistry of ZnO NPs and their effect on phototransformation of coexisting pollutants (sulfamethazine, SMZ) were systematically investigated under UV illumination. SMZ (40 μM) degradation was accelerated by ZnO NPs, as the observed reaction rate constant (kobs) increased from 0.0809 h−1 to 0.7982 h−1 at the concentration of 5–50 mg/L ZnO NPs. Free radical quenching and quantification experiments indicated the reactive oxygen species, especially the hydroxyl radicals (OH) and singlet oxygen (1O2), made great contributions to SMZ degradation. Moreover, SMZ was prone to be degraded at high pH with kobs reaching upto 0.5734 h−1 at pH 12.0. The presence of Cl− (1000 mM) reduced the SMZ decomposition greatly by 2.4-fold while the effects of SO42− (30 mM) were very limited. Natural organic matter including humic acid and tannic acid both inhibited the degradation of SMZ with kobs decreasing by 35.4-fold and 132-fold, respectively. During the photoreaction process, ZnO NPs fragmented into relative small size pieces obviously along with the release of Zn2+. Finally, the possible cotransformation pathways of ZnO NPs and SMZ were proposed based on SMZ degradation intermediates and the above results. These findings of the present study suggested that the photoreactions of ZnO NPs greatly influenced the transformation of contaminants and ZnO NPs themselves in aquatic environment, which may have significant implications for the fate assessment of NPs and environmental pollutants." @default.
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• W3018182040 date "2020-08-01" @default.
• W3018182040 modified "2023-10-02" @default.
• W3018182040 title "Phototransformation of zinc oxide nanoparticles and coexisting pollutant: Role of reactive oxygen species" @default.
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• W3018182040 doi "https://doi.org/10.1016/j.scitotenv.2020.138335" @default.
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