Colorful Silver/Carbon Nitride Composites Obtained by Photoreduction

Abstract

The Ag⁺ photoreduction by graphitic carbon nitride(g-CN) materials in a high concentration of Ag⁺ solution is reported, and a series of colorful Ag/g-CN composites is prepared and characterized. The chromatic change correlates to the carbon nitride materials synthesized at different heating temperatures(CN _T, where T means heating temperature), taking advantage of the different photocatalytic activities of different CN _T. The mechanism beneath this phenomenon is attributed to two factors: the particle size of Ag NPs and the coordinate effect of Ag NPs on CN _T sheets. Interestingly, the multicolors of Ag/g-CN composites display only on the CN _T materials synthesized from heating melamine-cyanuric acid precursor, but not on the CN _T from heating pure melamine. The color of the as-prepared Ag/g-CN composites can endure the corrosion of HNO₃ and ethanol, which shows a good chemical stability and may hint its application as chromophores.

Keywords

Graphitic carbon nitride(g-CN) / Photoreduction / Silver/g-CN composite

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