Visible light responsive CsPbBr3/TiO2 photocatalyst with long-term stability in aqueous solution

In this work, CsPbBr3/TiO2 nanocomposite photocatalyst exhibiting high visible light photocatalytic activity has been fabricated via a facile solution synthesis route at low temperature. CsPbBr3 quantum dots (QDs) were prepared by using supersaturated recrystallization method, and the surface was coated with amorphous TiO2 to enhance its stability. The CsPbBr3/TiO2 photocatalyst had excellent light absorption performance in a broad wavelength range and strong adsorption capacity for the organic pollutant. The formation of heterojunction between CsPbBr3 and TiO2 promoted the charge separation and thus improved the photocatalytic activity. In addition, photocatalytic degradation tests showed that the as-prepared nanocomposite exhibited high visible-light-induced photocatalytic activity under the simulated sunlight irradiation. And the obtained composite had long-term stability in water system and potential practical application value in the field of environmental governance.