Synthesis and Characterization of Attapulgite Clay Coated Ag/AgBr/TiO_2 Visible Light Photocatalyst

摘要

Attapulgite clay coated Ag/AgBr/TiO_2 visible light photocatalyst was prepared by an impregnation-deposition-precipitation method. The catalyst was characterized via powder X-ray diffraction (XRD), TEM, UV-Vis spectroscopy, and EMAX, and their photocatalytic activity was examined by degradation of methylene blue in water under sunlight. The results showed that the catalyst exhibited high efficiency for the degradation of methylene blue and the catalyst activity maintained effectively after successive cyclic experiments under sunlight, attributed to adsorption of dye on attapulgite clay and high dispersion of AgBr and TiO_2 nano-sized particles on the surface of attapulgite clay.