Ag-loaded Wool Spherical-like Bi_2WO_6 Nanoarchitectures Photocatalyst Degrade Pigments

摘要

Wool spherical-like Bi_2WO_6 nanoarchitectures were synthesized by hydrothermal method with using bismuth nitrate and sodium tungstate as raw materials. Ag was deposited on the surface of Bi_2WO_6 by a photoreduction process. The as-prepared products were characterized by XRD, and TEM. The XRD results revealed that the products have neglectable change in crystal with or without Ag, but obvious change in shape and intensity with different hydrothermal process time and optimal time is 12 h at 180°C. The TEM results shown that 7 h was chose as optimal hydrothermal process time. Rhodamine (RhB) and Light Green SF Yellowish (Light green) were chose as objects to evaluate the photocatalytic activities of the products under different light irradiation. The results showed that Ag loading greatly improved the photocatalytic activity of Bi_2WO_6. Meanwhile, the source of light is a very important affected factor for the photocatalyst degradation, ultraviolet light has the best efficiency, but visible light was chose as the light source finally due to conservation of energy and efficiency. The dynamic behavior of Ag-loaded Bi_2WO_6 photocatalyst degradation of two pigments obeys pseudo-first-order kinetics at 298 K. The as-synthesized photocatalysts are stable for degradation of two pigments and can be easily recycled.