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This study describes the encapsulation of ZnO by reduced graphene oxide to form a composite (ZnO/rGO) that can be incorporated into graphene to form hydrogels (ZnO/rGO-rGH) with three-dimensional (3D) network structures. The unique surface adsorption characteristics of graphene make ZnO/rGO-rGH materials have the ability of fast adsorption and desorption. Meanwhile, the combination of graphene and ZnO nanoparticles can promote the separation efficiency of electrons and holes and improve the photocatalytic activity. The sample showed the highest adsorption-photocatalysis synergistic activity and removed 100% of the BPA (10 mg L -1 ) within 20 min under UV irradiation. The purification efficiency of ZnO/rGO-rGH can reach more than 90% after 5 rounds of repeated use. We also measured the performance of ZnO/rGO-rGH in removing BPA under flow conditions, and the results showed that this approach with ZnO/rGO-rGH removed 100% of the BPA in 16 h.

A separation-free 3D network ZnO/rGO–rGH hydrogel: adsorption enriched photocatalysis for environmental applications