تخريب تتراسايكلين در راكتور فيلم نازك بستر ثابت توسط فوتوكاتاليست نانوآميزه‌ي سه جزئي Bi2WO6/TiO2/ZIF-67 پاسخگو به نور مرئي

Given the necessity of removing pharmaceutical pollutants an‎d their associated risks in aquatic environments, the elimination of tetracycline was selec‎ted as the focus of this study. For this purpose, a photocatalytic process was employed using a ternary nanocomposite Bi₂WO₆/TiO₂/ZIF-67, synthesized via a hydrothermal method. Experiments demonstrated that the photocatalyst Bi₂WO₆/TiO₂/ZIF-67 with 25 wt% TiO₂ an‎d 10 wt% ZIF-67 exhibited the highest photocatalytic performance. To eva‎luate the synthesized photocatalyst, various characterization techniques, including XRD, FTIR, BET, PL, UV-vis DRS, XRF, FE-SEM, EDS, Mapping, TEM, Photocurrent, ICP-OES, an‎d LC-MS, were utilized.The removal efficiency of tetracycline from aqueous solutions in a slurry system was examined under different operational factors, including pH, pollutant concentration, photocatalyst loading, an‎d light intensity. Optimal conditions were determined to be pH = 7, a photocatalyst loading of 0.4 g/L, pollutant concentration of 10 ppm, an‎d light intensity of 600 W/m², achieving 100% removal of tetracycline within 240 minutes.To address challenges associated with the slurry system, the photocatalyst was immobilized on conductive ITO glass for use in a fixed-bed thin-film photoreactor. The effects of operational parameters in the immobilized system, such as light intensity, residence time, an‎d the photocatalyst-to-pollutant concentration ratio, were investigated. Optimal conditions, determined using the classical one-factor-at-a-time optimization method, included a photocatalyst-to-pollutant ratio (L/C) of 0.2 g per mg pollutant, a residence time of 100 minutes, pH = 7, an‎d light intensity of 600 W/m². Under these conditions, the immobilized photocatalyst on ITO glass achieved a removal efficiency of 95%. Also, the stabilized state was compared under visible light an‎d under sunlight, an‎d the results showed improved removal efficiency under sunlight in a shorter time.

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