Nanocrystalline GaSbO_4 with high surface area prepared via a facile hydrothermal method and its photocatalytic activity study

摘要

Nanocrystalline GaSbO_4 with small particle size and large BET specific area was successfully prepared via a facile hydrothermal method from Sb_2O_5. The influence of the reaction pH on the formation of the final product was investigated. The obtained sample was characterized by X-ray diffraction (XRD), N_2-sorption BET surface area, UV-vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM). The photocatalytic activity for the degradations of salicylic acid and acetone over nanocrystalline GaSbO_4 under UV irradiations was for the first time revealed. Based on the electron spin resonance (ESR) result, the reactive species involved in the photocatalytic reaction over nanocrytalline GaSbO_4 are determined to be HO*** and O_2~***. The photocatalytic mechanism of GaSbO_4 was proposed.