Abstract
Hierarchical flower-like Bi2WO6was successfully synthesized by facile hydrothermal method at low pH. And Ag/AgCl was loaded by photoreduction on its surface. As-prepared photocatalysts were characterized by various techniques. Bi2WO6was successfully synthesized at a size of 2-3 μm. Depositing Ag/AgCl did not destroy the crystal structure, and both Ag+and metallic Ag0were found. The band gap of the composite was 2.57 eV, which indicates that visible light could be the activating irradiation. In the photocatalytic activity test, the composite with 10 wt% Ag/AgCl boasted the highest removal efficiency (almost 100%) in 45 min. The significant enhancement can be attributed to the surface plasmon resonance (SPR) effect and the establishment of heterostructures between Ag/AgCl and Bi2WO6. A possible mechanism of photocatalytic oxidation in the presence of Ag/AgCl-Bi2WO6was proposed. This work sheds light on the potential applications of plasmonic metals in photocatalysis to enhance their activities.
Highlights
Surface plasmon resonance (SPR) has been widely applied in the conversion of solar to chemical energy
The enhanced photocatalytic activity may be regarded as solid evidence of the potential application of Ag/AgCl in photocatalytic oxidation processes
Final products were separated via centrifugation, washed twice with deionized water (DDW), and dried at 60∘C for 12 h
Summary
Surface plasmon resonance (SPR) has been widely applied in the conversion of solar to chemical energy. Ag/AgCl was first reported by Wang et al to exhibit an excellent photocatalytic activity due to the SPR effect [2]. Numerous novel photocatalytic materials have been reported Among these materials, Bi2WO6, with a band gap of 2.70 eV, has been found to exhibit a high visiblelight-driven photocatalytic activity with regard to the degradation of organic contaminants [6]. Bi2WO6, with a band gap of 2.70 eV, has been found to exhibit a high visiblelight-driven photocatalytic activity with regard to the degradation of organic contaminants [6] This is due to the valence band of bismuth-based photocatalysts consisting of . Ag/AgCl-Bi2WO6 heterostructure applied in the degradation of organic pollutants. Bi2WO6 should enhance its photocatalytic activity due to the SPR effect and the heterostructure. The enhanced photocatalytic activity may be regarded as solid evidence of the potential application of Ag/AgCl in photocatalytic oxidation processes
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