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(a,b) Impact of various quenching agents (EDTA–2Na, BQ or IBA) on the photodegradation of methylene blue under 405 nm purple light. (c,d) ESR spectra of the CQDs/FeOx composite in methanol (c) and water (d) using DMPO as a radical trapping agent. (e,f) ESR spectra of FeOx in methanol (e) and water (f) using DMPO as a radical trapping agent. (g) Diagram illustrating the photocatalytic mechanism of the CQDs/FeOx composite.
