Preparation, characterization and photocatalytic performance of K8[Fe(H2O)W11MnO39]/PANI/TiO2 ternary composite

Abstract

AbstractA new ternary composite catalyst, K8[Fe(H2O)W11MnO39]/PANI/TiO2, was synthesized by electrostatic self‐assembly method, of which K8[Fe(H2O)W11MnO39] was prepared by direct synthesis method, and PANI/TiO2 was prepared by coating polyaniline on the surface of TiO2 particles using chemical oxidation method with (NH4)2S2O8 as oxidant. Then, this ternary composite material was characterized by infrared (IR) spectroscopy, ultraviolet‐visible spectroscopy, X‐ray diffraction, scanning electron microscopy and N2 adsorption‐desorption, and its photocatalytic performance was explored through degradation experiments with gentian violet as an organic pollutant. The results showed that K8[Fe(H2O)W11MnO39]/PANI/TiO2 was successfully synthesized and its Keggin structure still remained with good stability. Under the optimal photocatalytic conditions, the decolorization rate of gentian violet by the ternary composite catalyst could reach to 92.93 %. After being recycled three times, the new composite catalyst still maintains good catalytic activity, indicating that it has a strong ability and reusability to degrade gentian violet with an excellent research potential.