Abstract
Efficient separation of photogenerated carriers and light harvesting are the two key factors for high photocatalytic performance. In this work, a novel double-heterojunction silver/nanodiamond/graphite-carbon nitride (Ag/ND/g-C3N4) structured photocatalyst has been synthesized. In comparison to single-heterojunction Ag/g-C3N4, the double-heterojunction Ag/ND/g-C3N4 photocatalyst presents with a 4.9-times enhancement in H2 evolution from water splitting and 2.4-times promotion in degrading organic pollution under visible-light irradiation. Furthermore, the Ag/ND/g-C3N4 exhibits good photostability after four-run test. The enhanced photocatalytic activity can be attributed to the synergetic effect of surface plasmon resonance from Ag, optical confinement from ND and suitable band alignment in the double-heterojunction structure, which boost the light absorption capacity and increase the photogenerated charge separation of g-C3N4. This study provides a reference for the development of efficient carbon based photocatalysts, which can be used not only for the production of H2 from water splitting, but also for the photodegradation of pollutants under visible light irradiation.
Published Version
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