Synthesis of magnetic g-C3N4/FeTiO3/MnFe2O4 ternary nanocomposite for enhanced visible light photocatalytic degradation of crystal violet
摘要
In this study, a novel magnetic g-C3N4/FeTiO3/MnFe2O4 nanocomposite were successfully prepared using a simple hydrothermal synthetic route. The physicochemical and optical characteristics of the obtained samples were investigated through various techniques. Ternary g-C3N4/FeTiO3/MnFe2O4 nanocomposite significantly accelerated the degradation of crystal violet (CV) compared to bare and binary samples under irradiation of visible light. The decoration of FeTiO3 and MnFe2O4 on g-C3N4 led to formation a heterojunction, which effectively prevent the recombination of photogenerated charge carriers. The effects of initial concentration of CV, photocatalyst amount, pH of solution on the photocatalyst activity of g-C3N4/FeTiO3/MnFe2O4 were investigated, and the results revealed that the maximum photodegradation efficiency (99.05%) was obtained at initial CV concentration of 20 mg/L, photocatalyst amount of 0.4 g/L, and pH of 8. The kinetic studies show that, the rate constant value of CV photodegradation using g-C3N4/FeTiO3/MnFe2O4 nanocomposite was higher than those of g-C3N4, FeTiO3, MnFe2O4, g-C3N4/FeTiO3, g-C3N4/MnFe2O4, and FeTiO3/MnFe2O4. The scavenging analyses were shown that the key active species in the CV photocatalytic degradation were h+ and •OH, while •O2− was secondary species in the photodegradation process. Finally, a possible mechanism for CV photodegradation using g-C3N4/FeTiO3/MnFe2O4 nanocomposites was proposed.