Abstract
Ag3PO4/g-C3N4 nanocomposite photocatalysts were synthesized by calcining the mixture of urea and trace amount of Ag3PO4 microcrystals at 600 °C, in which Ag3PO4 nanoparticles with size of 20–30 nm were wrapped with g-C3N4 layers. The obtained Ag3PO4/g-C3N4 composites exhibited efficient utilization of visible light and separation of photoinduced electron–hole pairs, resulting in enhanced photocatalytic activity for H2 evolution. The optimum photocatalytic H2 evolution rate under visible light without Pt co-catalyst for 0.04AP-CN composite was 89.4 µmol/h, which is 3.34 times of that of g-C3N4 (26.7 µmol/h). The H2 evolution rate for 0.04AP-CN with 3 wt% Pt co-catalyst was up to 273.6 µmol/h, which is 2.39 times of that g-C3N4 (114.4 µmol/h). The performance of Ag3PO4/g-C3N4 composite was enhanced significantly due to the synergistic effect of the interface formed between Ag3PO4 and g-C3N4.
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