Abstract
A novel visible light response Ag–AgBr@HHSS photocatalyst (Ag–AgBr encapsulated in hierarchical hollow silica spheres) was synthesized by a facile one-pot method using CTAB as template. The as-synthesized photocatalyst was characterized by techniques of XRD, SEM, EDS, TEM, N2 adsorption–desorption analysis and UV–Vis diffuse reflectance spectra. Structural characterization indicated that the as-synthesized Ag–AgBr@HHSS photocatalyst possessed a small-hollow-sphere@big-hollow-sphere structure with a diameter of 90–150nm and a high specific surface area of 540m2/g. The Ag–AgBr nanoparticles with average crystallite size of 7.5nm were encapsulated dispersedly in the HHSS matrix. The photocatalytic activity of the photocatalyst was investigated by the degradation of methyl orange under visible light irradiation. Due to its smaller Ag–AgBr particle size and special hollow structure, the Ag–AgBr@HHSS showed higher photocatalytic activity than Ag–AgBr/MCM-41. The Ag–AgBr@HHSS exhibited good reusability and maintained more than 93% of the initial photocatalytic activity even after 5 runs of recycling.
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