Synthesis and Surface Characterization of Ni-ZnO /Pollyaniline Nanocomposite for the Removal of Bromophenol Blue Dye under Visible Light Irradiation.

Abstract

The application of dyes in different process industries will cause environmental impact. Thus, the need for removal of dyes by using hybrid photocatalytic process under UV-Vis irradiation is a vital issue to decrease the effect of dyes. Ni-ZnO/Polyaniline hybrid photocatalysts are synthesized and used for the experiments of degradation of dyes from water under visible light irradiation. XRD, UV-Vis absorption, FTIR and SEM are used to characterize the prepared materials. It is shown that the Ni2+ amount doped into ZnO controls its morphology and enhances its photoactivity for dye degradation. Polyaniline (PANI) is shown to sensitize ZnO and to extend its light absorption toward the visible region. ZnO, Ni-ZnO and Ni-ZnO/PANI was used in the photocatalytic decolorization study of a dye i.e.,bromophenol blue (BPB). During Usage of this semiconductor as a photocatalyst for removal of dye, physiochemical characteristics of the photocatalyst, the effect of the various process parameters like initial dye concentration, catalyst loading, pH, catalyst types and UV irradiations time on the photodegradation of BPB were investigated using surface Response methodology. According to analysis of variance numerical optimization 99.87 % removal efficiency were formed through adjusting the selected parameters (initial dye concentration, catalyst loading, pH, catalyst types and UV irradiations time) under specified or bounded conditions. Furthermore, the rate of dye degradation (reaction) kinetics was also studied. The result indicates from first order Languier-Hinshewood kinetics model.