Photodegradation of water pollutants under the catalytic activity of graphene-Fe3O4derived nanocomposites plays a prominent role within the field of environmental nanoscience. However, few researchers drive their attention to the Fe3O4leaching and the real contribution of graphene/graphene oxide in the photodegradation. In this work, amino-Fe3O4-functionalized graphene oxide was synthesized and applied in the photodegradation of the Reactive Black 5 (RB5) dye. The nanocatalyst was characterized by FTIR, XRD, SEM with EDS and EPR techniques. Moreover, it was investigated the effect of the Fe3O4 leaching on the removal of the RB5 over 6 cycles of regeneration. The adsorption contribution was also investigated by experiments carried out in darkness and without the addition of hydrogen peroxide. Despite the great RB5 removal efficiency (up to 97 %), EDS analysis evidenced that the Fe3O4 was removed after the 6 cycles of RB5 photodegradation. Between the hypotheses which could explain the removal of Fe3O4 over the cycles, the low level of interactions between Fe3O4 and the graphenic plane and functional moieties are one of the most feasible. These data contributes to explain the significance of graphene oxide in the generation of hydroxyl radicals, mostly due to its low band gap energy.

The Effect of Fe3O4 Leaching Over the Photocatalytic Activity of Fe3O4-Graphene Oxide Nanocomposite

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