Preparation, characterization and activity evaluation of Ag2Mo4O13 photocatalyst

Abstract

Ag2Mo4O13 photocatalyst was prepared by the hydrothermal method using AgNO3 and (NH4)2MoO4 as raw materials in one step. The Ag2Mo4O13 photocatalyst was characterized by X-ray powder diffraction (XRD), UV–Vis diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, N2 adsorption measurements, and terephthalic acid photoluminescence (TA-PL) probing technique. The photocatalytic activity of the photocatalyst was evaluated by photocatalytic oxidation of methyl orange and photocatalytic reduction of nitrobenzene. The results showed that, the optimum catalyst concentration is 3g/L, and the optimum optical thickness is 49.4. When the reaction solution was illuminated for 60min and 10h, and the amount of photocatalyst was 2.0g/L, the methyl orange conversion and aniline yield were 76.4% and 63.3%, respectively. The effect of different heat treatment conditions on the photocatalytic activity of the photocatalyst was also investigated. The best preparation condition is heat treatment at 500°C for 10h. Compared with those photocatalysts prepared at any other conditions, the photoabsorption wavelength range of the photocatalyst calcined at 500°C for 10h extends greatly towards visible light and it also improves the utilization of the total spectrum. The mechanisms of influence on the photocatalytic activity were also discussed.