Silver orthophosphate immobilized on flaky layered double hydroxides as the visible-light-driven photocatalysts

Abstract

Flaky layered double hydroxide (FLDH) was prepared by the reconstruction of its oxide in alkali solution. The composites with FLDH/Ag3PO 4 mass ratios at 1.6:1 and 3:1 were fabricated by the coprecipitation method. The powders were characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscope, and UV-vis diffuse reflectance spectroscopy. The results indicated that the well-distributed Ag3PO4 in a fine crystallite size was formed on the surface of FLDH. The photocatalytic activities of the Ag 3PO4 immobilized on FLDH were significantly enhanced for the degradation of acid red G under visible light irradiation compared to bare Ag3PO4. The composite with the FLDH/Ag3PO 4 mass ratio of 3:1 showed a higher photocatalytic efficiency. Copyright © 2012 Xianlu Cui et al.