- Thesis topic: Photocatalytic activity of SnO2/Bi₂S₃-BiOCl for removal of Acid red

- Doi: https://doi.org/10.6840/cycu202000882

- Abstract: 

         In this study, SnO2/Bi2S3-BiOCl composites were used for the degradation of acid red dye from wastewater. All the catalysts were prepared by hydrothermal method using different percentages weight of SnO2, Bi2S3, 5% SnO2/Bi2S3-BiOCl, 15% SnO2/Bi2S3-BiOCl, 30% SnO2/Bi2S3-BiOCl and 50% SnO2/Bi2S3-BiOCl. The obtained composites were analyzed using X-ray diffraction (XRD), Diffuse reflectance spectroscopy (DRS), Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR). For the SnO2/Bi2S3-BiOCl composites, investigated the effect of different acid red dye concentrations, effect of pH, catalyst amounts, reusability investigation on photodegradation efficiency. Initially, the optimal synthesis conditions for SnO2/Bi2S3-BiOCl catalysts were identified and then these optimized conditions were used for Acid red that was used as a model pollutant. Photocatalyst degradation of SnO2/Bi2S3-BiOCl composites showed that the different percentage composite catalysts were more efficiency and stable than the pure Bi2S3, SnO2, catalysts. The composite fabricated with 15% SnO2/Bi2S3-BiOCl was observed to be more stable for 3st cycles. The photodegradation experiment was completed at different parameter such as catalyst dosage SnO2, Bi₂S₃, 5% SnO2/Bi2S3-BiOCl, 15% SnO2/Bi2S3-BiOCl, 30% SnO2/Bi2S3-BiOCl, 50% SnO2/Bi2S3-BiOCl. In this study 15% SnO2/Bi₂S₃-BiOCl under the optimum operating condition (initial concentration of acid red was 10 ppm, catalyst dosage was 0.03 g, and pH value was 7.0), the degradation rate of Acid red was 57% within 180 min under visible light. However, the removal efficiencies of pure Bi₂S₃ and SnO2 were 6% and 4% respectively.

Keywords: Photocatalytic, Hydrothermal, Photodegradation, Acid red