Abstract-Visible light photocatalytic degradation of nitrogen dioxide was studied using zinc ferrite titania as photocatalyst. A photocatalytic reactor was made up of concrete block and glass was fabricated for studying photocatalytic oxidation of NO2 under visible light. Zinc ferrite titania was prepared and it's particle size and band gap energy was found out by X-Ray Diffraction (XRD) study and UltravioletDiffusive Reflectance Spectrometry (UV-DRS) respectively. Catalyst was coated on the concrete block surface and NO2 was produced and pumped in to the reactor which was equipped with visible light source. Effect of catalyst dosage, irradiation time, light intensity and initial concentration of NO2 were studied in lab scale and optimum catalyst dosage and irradiation time was found to be 10 mg/cm 2 and 20 minutes respectively. The maximum removal efficiency was found to be 84% at optimum conditions. It was observed that removal efficiency of nitrogen dioxide increases as the light intensity increases and decreases as the initial concentration increases. Performance of zinc ferrite titania catalyzed photodegradation was evaluated in the field under direct sunlight and ambient NO2. Average removal efficiency of ambient NO2 was found to be 81% in the field
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