Abstract
A visible-light responsive photocatalyst consisting of Ag–AgCl composite dispersed over BiVO 4 (Ag–AgCl/BiVO 4) was synthesized via a photolysis and calcination method. The effects of synthetic conditions such as Ag contents, molar ratios of chlorine to silver and calcination temperatures have been discussed. The coupling Ag–AgCl composite structure, which is necessary for the high photoactivity, comes into being by partially converting Ag nanoclusters into AgCl during heat treatment. The discoloration efficiency of methyl orange over the as-prepared Ag–AgCl/BiVO 4 was more than 90% after 120 min under visible light irradiation. In the Ag–AgCl/BiVO 4 system, the coupled processes of excitation from valence band of AgCl to the sensitizer Ag nanoparticles and the surface plasmonic resonance of Ag nanoparticles mainly contributed to its high activity. In addition, the presence of BiVO 4 changed the hole transfer process, and O 2 − became to be the solely main active specie in the degradation reaction. The photocatalytic activity can be further improved by the addition of hole scavengers.
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