A New Approach for Photocorrosion Inhibition of Ag<sub>2</sub>CO<sub>3</sub> Photocatalyst with Highly Visible-Light-Responsive Reactivity

Abstract

A novel visible-light-responsive photocatalyst Ag<sub>2</sub>CO<sub>3</sub> was prepared by a facile precipitation reaction between NaHCO<sub>3</sub> and AgNO<sub>3</sub>. The as-prepared samples showed relatively high photocatalytic activity toward rhodamine B (RhB) degradation in aqueous solution. The observed photoreactivity on Ag<sub>2</sub>CO<sub>3</sub> was attributed to the synergetic effects of small band gap, great oxidation potential of photogenerated holes, and high separation efficiency of photogenerated electrons and holes. Nevertheless, Ag<sub>2</sub>CO<sub>3</sub> was unstable under visible light due to the photocorrosion resulting from metallic silver formation. The photocorrosion of Ag<sub>2</sub>CO<sub>3</sub> can be efficiently inhibited by adding AgNO<sub>3</sub> in the photocatalytic reaction system owing to the lower electrode potential of Ag/AgNO<sub>3</sub> than that of Ag/Ag<sub>2</sub>CO<sub>3</sub>. Our results shed new light on the photocatalytic activity as well as photocorrosion mechanism of silver-containing compounds and inhibit the method of photocorrosion

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