Preparation and photocatalytic performance of TiO2-RGO-CuO/Fe2O3 ternary composite photocatalyst by solvothermal method

Abstract

In this work, an one-step solvothermal synthesis method is used to prepare TiO _2 -reduced graphene oxide (RGO)-CuO/Fe _2 O _3 ternary composite photocatalysts with TiO _2 and CuO/Fe _2 O _3 nanoparticles coated RGO, while the structures and photocatalytic performance of these synthesized ternary composite photocatalysts are studied. It is found that Cu ^2+ and Fe ^3+ are substituted for Ti ^4+ into the crystal lattice of anatase TiO _2 in these prepared ternary composite photocatalysts. TiO _2 and CuO/Fe _2 O _3 nanoparticles are uniformly coated on the surface of RGO and closely contact with each other. The Cu/Fe doping has obviously improved the absorption ability on the visible light, and the bandgap of the ternary composite can be reduced. Under visible light irradiation, by increasing the Cu/Fe doping amount, the photocatalytic performance can be improved until the Cu and Fe contents reached 0.075 wt.% and 0.1 wt.%, respectively. The prepared products can be reused for eight cycles to degrade the methyl orange solution, and it retains over 93% photocatalytic efficiency.

Keywords

• solvothermal synthesis
• Cu/Fe doping
• ternary composite
• reduced graphene oxide
• photocatalytic activity