Abstract:
In this paper, four kinds of WO
3 nanomaterials with exposed 020/002 facets (HF−WO
3), 110/002 facets (HAc−WO
3, H
2O
2−WO
3) and 200/002/020 facets (NH
4F−WO
3) were hydrothermal synthesized by using Na
2WO
4·2H
2O as tungsten source, and acetic acid, hydrogen peroxide, hydrofluoric acid and ammonium fluoride as the morphology control agents, respectively. The crystal structure, morphology, optical properties, carrier migration and recombination of the prepared products were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), photoluminescence spectroscopy (PL) and electrochemical impedance spectroscopy (EIS). The mechanism of transformation from Na
2WO
4 to product WO
3 was studied and the photocatalytic performance of the WO
3 nanomaterials was evaluated by the degradation experiment of the
p-nitrophenol solution under ultraviolet light. The results show that the NH
4F−WO
3 sample with co-exposed 200/002/020 facets exhibit the best photocatalytic performance in the photocatalytic degradation of
p-nitrophenol solution.