Investigation of the effect of PAn and PAn/ZnO photocatalysts on 100% degradation of Congo red under UV visible light irradiation and lightless environment

PAn polyaniline and PAn/ZnO photocatalysts were synthesized using chemical polymerization of aniline. The structure characterization of the synthesized samples was analysed by using X-ray diffraction XRD , Fourier transforminfraredspectroscopy FT-IR ,scanningelectronmicroscopy SEM ,transmissionelectronmicroscopy TEM , and UV-Vis spectroscopy measurements, and thermal gravimetric analysis TGA . The photocatalytic activities of PAn and PAn/ZnO 0.1g/100ml on the degradation of the Congo red CR dye were studied under the UV visible light irradiation and the lightless environment and the efficiency of catalysts have been explained in details. Contribution of UV visible light irradiation on the 100% degradation of CR dye for the PAn and PAn/ZnO photocatalyst is determined. The reaction kinetics and effect of pH pH 4 and pH 10 were investigated by using first order kinetic model. According to the experimental results, photocatalytic reaction rate of Congo Red increased in acidic environment and under UV visible light irradiation.

Keywords:

Congo red, photocatalytic degradation lightless, UV-vis light irradiation,

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