Preparation and Photocatalytic Degradation of Malachite Green by Photocatalyst SrBi4O7 under Visible Light Irradiation

Abstract

Visible-light responsive SrBi4O7 photocatalyst was prepared by a traditional copreparation method. The photocatalyst was characterized by XRD and UV-Vis diffuse reflectance spectra. The as-prepared photocatalysts were used for the photocatalytic degradation of malachite green (MG) under visible light irradiation. Preparation conditions of catalysts, concentration of malachite green, photocatalyst dosage, irradiation time and photocatalytic reaction kinetics have been investigated. Under the optimized reaction conditions, decolourization ratio and COD removal rates of MG were 99.62% and 95.6%, respectively. The results indicate that SrBi4O7 has good photocatalytic activities for the decomposition of MG. And it has the potential higher visible light photocatalytic activity with a band gap of 2.44 eV.