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(A) Photograph
depicting vials of graphene oxide solution after
0, 1, and 3 days of the photo-Fenton reaction. (B) Fluorescence spectra
of the solutions contained in (A). (C) LDI-TOF MS and (D) Orbitrap
ESI-MS spectra for sample after 0, 1, and 3 days of the photo-Fenton
reaction.