A novel synthesis of magnetic anatase TiO۲ loaded by graphene quantum dots with improved the application in methylene blue degradation

In this work graphene quantum dots (GQD) nanoparticles with maltose precursor are prepared for the first time and loaded onto Fe۳O۴/TiO۲ nanocomposites by hydrothermal method. The characterization by HRTEM, N۲ adsorption/desorption and TGA of new nanocomposite showed spherical morphology, mesoporous structure with a specific surface area about ۳۸.۰۰ m۲/g and thermostable. This particle is applied as a photocatalyst for methylene blue (MB) degradation under UVA light irradiation. Moreover, MB decomposed with direct oxidative degradation in electron photogeneration transfer. The efficiency of removal was obtained up to ۸۰% at photocatalytic dose of ۰.۵ g/L, pH of ۱۱, and MB concentration of ۱۰ mg/L under ۹۰ min irradiation. The photocatalytic removal of MB revealed the first-order kinetics under irradiation.

Keywords:

anatase TiO۲ , Fe۳O۴/TiO۲/GQDs , photocatalytic degradation , photogeneration