Preparation and Photocatalytic Activity of an Inorganic-Organic Hybrid Photocatalyst Ag2WO4/g-C3N4

Ag2WO4/g-C3N4 composites with different Ag2WO4 concentration and calcination temperature were synthesized via a mixing and heating approach. Various techniques were used to investigate the characters of the as-prepared samples, such as thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and photoluminescence spectroscopy. The degradation of rhodamine B (20 ppm) under visible light was performed to investigate the photocatalytic activity of Ag2WO4/g-C3N4 composites. Results indicate that the Ag2WO4/g-C3N4 is actually Ag/Ag2WO4/g-C3N4 ternary system. 7.5 wt% Ag2WO4/g-C3N4 prepared at 300 A degrees C presented the best photocatalytic performance in rhodamine B degradation. The degradation rate reaches 0.0679 min(-1), which is 3.25 times higher than the value of pure g-C3N4. The enhanced activity is attributed to the synergetic effect of Ag2WO4, g-C3N4 and metal Ag. Additionally, cycling experiments also proved that the Ag2WO4/g-C3N4 photocatalyst has good stability.