The contribution of indirect photolysis to the degradation of graphene oxide in sunlight

Wen Che Hou, W. Matthew Henderson, Indranil Chowdhury, David G. Goodwin, Xiaojun Chang, Sharon Martin, D. Howard Fairbrother, Dermont Bouchard, Richard G. Zepp

研究成果: Article同行評審

28 引文 斯高帕斯(Scopus)

摘要

This paper probes the role of hydroxyl radicals (·OH) generated by H2O2 photolysis on graphene oxide (GO) phototransformation, under simulated sunlight. It focuses on comparing the photoreaction of GO with (indirect) and without (direct) added H2O2 under simulated sunlight conditions. The biomarker responses of fish epithelial cells in in vitro assays of parent GO and GO photoreacted with H2O2 and their interaction with model biomembranes are also compared. GO was found to be far more extensively photodecomposed in the presence of H2O2, with ∼85% of the initial carbon content converted to CO2 during 48 h of irradiation. Direct and indirect photoreactions occurred concurrently in GO samples containing H2O2, and indirect photoreaction accounted for ∼70% of GO conversion to CO2. Reaction with ·OH causes increases in the concentrations of carboxylic acid groups of photoreacted GO and low-molecular-weight (LMW) species as part of the intermediate photoproducts. Compared to parent GO, intermediate photoproducts exhibited reduced interaction with model cell membranes and altered biomarker responses. Kinetic analysis extrapolating our data to conditions prevalent in sunlit surface waters predicts that initial GO photoreaction is dominated by direct photolysis, while indirect photoreactions involving ·OH determine subsequent conversion of intermediate GO photoproducts to CO2.

原文English
頁(從 - 到)426-437
頁數12
期刊Carbon
110
DOIs
出版狀態Published - 2016 12月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料科學(全部)

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