Preparation and study photocatalytic properties of BiOX (X= Cl, Br, I)

Abstract

Recently, bismuth oxyhalide materials have established more and more interest as shows potential photocatalysts because their exceptional layered structures give them with attractive physicochemical properties, and the photocatalysis process was used to remove the polluting indigo carmine dye from industrial wastewater. Where some factors affecting the treatment process were studied, including the effect of the amount of catalyst, pH, temperature and the initial concentration of the dye. All factors affecting the removal of indigo carmine dye in the presence of ultraviolet radiation lamp of wavelength 245 nm have been studied.  Then study the thermodynamic properties of dye adsorption and find the values of thermodynamic functions (∆H, ∆S, ∆G).  The adsorption isotherms were determined by the Langumire-Freundlich equations, where the adsorption of the dye on the surface of the (BiOCl, BiOI) compounds was subject to freundlich equation, (BiOBr) was subject to langumire equation.  The kinetics of dye adsorption was also studied by applying the pseudo first and second order equations, the practical results shown that the adsorption kinetics of the dye used in the study is subject to the pseudo second order equation. The compound was identified by infrared (IR), X-ray diffraction (XRD) and scanning electron (SEM) techniques.