Preparation and photocatalytic activity of tio2/ppy/go for the degradation of rose bengal and victoria blue dye in visible light in aqueous solution

Abstract

This research work describes a proficient method for synthesis of TiO2/PPy and TiO2/PPy/GO nanocomposites. These nanocomposites were prepared by one-step in-situ deposition oxidative polymerization of pyrrole hydrochloride using ammonium persulphate as an oxidant in the presence of TiO2 nanoparticles (NPs) cooled in an ice bath. The obtained nanocomposites were characterized by X-ray diffraction, transmission electron microscope, scanning electron microscope, UV-Visible, Brunauer– Emmett–Teller, and photoluminescence spectra techniques. The obtained results showed that TiO2 NPs have been encapsulated by PPy with a strong effect on the morphology of TiO2/PPy and TiO2/ PPy/GO nanocomposites. The photocatalytic degradation of Rose Bengal and Victoria Blue dyes were done at different condition viz. concentration of dye, time of illumination, pH, and dose of photocatalyst. The maximum photodegradation of dyes was found at 7 pH, 20 ppm concentration of Victoria Blue and 25 ppm of Rose Bengal dye solution, 800 mg/L for Victoria Blue dye (VB) and 1,600 mg/L for Rose Bengal dye (RB) amount of photocatalyst, and 120 min irradiation of visible light. Kinetics of photodegradation was investigated for VB and RB dye and found first-order kinetics.