Photochemical transformation of graphene oxide in sunlight

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

Research output: Contribution to journalArticlepeer-review

202 Citations (Scopus)


Graphene oxide (GO) is promising in scalable production and has useful properties that include semiconducting behavior, catalytic reactivity, and aqueous dispersibility. In this study, we investigated the photochemical fate of GO under environmentally relevant sunlight conditions. The results indicate that GO readily photoreacts under simulated sunlight with the potential involvement of electron-hole pair creation. GO was shown to photodisproportionate to CO2, reduced materials similar to reduced GO (rGO) that are fragmented compared to the starting material, and low molecular-weight (LMW) species. Kinetic studies show that the rate of the initially rapid photoreaction of GO is insensitive to the dissolved oxygen content. In contrast, at longer time points (>10 h), the presence of dissolved oxygen led to a greater production of CO2 than the same GO material under N2-saturated conditions. Regardless, the rGO species themselves persist after extended irradiation equivalent to 2 months in natural sunlight, even in the presence of dissolved oxygen. Overall, our findings indicate that GO phototransforms rapidly under sunlight exposure, resulting in chemically reduced and persistent photoproducts that are likely to exhibit transport and toxic properties unique from parent GO.

Original languageEnglish
Pages (from-to)3435-3443
Number of pages9
JournalEnvironmental Science and Technology
Issue number6
Publication statusPublished - 2015 Mar 17

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Environmental Chemistry


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