Preparation of graphene-TiO2 photocatalysis materials by laser-induced hydrothermal method

Abstract Layered porous graphene (G-Phenolic/Kapton) have been prepared by laser irradiating the double-layer polymer Phenolic/Kapton, and G-Phenolic/Kapton-TiO2 photocatalyst have been prepared via hydrothermal method for the degradation of dye wastewater. It was discovered that the graphene obtained by laser irradiation of the composite polymer has better quality than the induced single polymer, and it is speculated that phenomenon is related to the heat absorption and heat dissipation capacity of the composite material. The prepared photocatalyst photocatalytic activity was evaluated by the degradation of Methylene Blue(MB) and Rhodamine-B(RhB) dyes.The experimental data show that compared with pure TiO2, G-Phenolic/Kapton-TiO2 composite material increases MB and RhB dyes' degradation by 13.98 and 15.2 folds, respectively. This enhanced photocatalytic property is because the introduction of graphene can promote the separation of photogenerated electrons and holes.Meanwhile,According to the experimental results, •O2− and h+ species free radicals are the reaction system's main reactive species.