A Ag/C 3 N 4 nanocomposite with optimum Ag content is an efficient and green photocatalyst for pollutant degradation under visible light irradiation. In this study, we synthesized Ag NPs using NaBH 4 and the squeezed out liquid (SOL) of plant biomass. The Ag NPs thus obtained have been loaded to C 3 N 4 to form Ag/C 3 N 4 nanocomposites that show superior photocatalytic performance toward Rhodamine B (RhB) under visible light irradiation. The photocatalytic activity of both biogenic and chemogenic Ag/C 3 N 4 nanocomposites with different Ag contents is compared. Results show that the biogenically synthesized Ag/C 3 N 4 exhibits better photocatalytic performance than the chemosynthetic composite. Of all the different nanocomposites prepared in this study, Ag 48 /C 3 N 4 (0.048% of Ag content) exhibits excellent photoreactivity, with a reaction rate constant ( k ) 7-fold higher that the chemosynthetic Ag/C 3 N 4 . The observed improvement in the photoreactivity is mainly attributed to the high dispersion of Ag NPs on C 3 N 4, facilitated by the organic compounds in SOLs. Besides, these organic compounds also enhance the photoreactivity of the catalyst by providing adsorption sited for RhB molecules and by shifting the Fermi level to more negative potential.
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Tian et al. (2014) studied this question.
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