| Summary: | Ag<sub>3</sub>PO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> heterojunctions, with different g-C<sub>3</sub>N<sub>4</sub> dosages, were synthesized using an in situ deposition method, and the photocatalytic performance of g-C<sub>3</sub>N<sub>4</sub>/Ag<sub>3</sub>PO<sub>4</sub> heterojunctions was studied under simulated sunlight conditions. The results revealed that Ag<sub>3</sub>PO<sub>4</sub>/g-C<sub>3</sub>N<sub>4</sub> exhibited excellent photocatalytic degradation activity for rhodamine B (Rh B) and phenol under the same light conditions. When the dosage of g-C<sub>3</sub>N<sub>4</sub> was 30%, the degradation rate of Rh B at 9 min and phenol at 30 min was found to be 99.4% and 97.3%, respectively. After five cycles of the degradation experiment for Rh B, g-C<sub>3</sub>N<sub>4</sub>/Ag<sub>3</sub>PO<sub>4</sub> still demonstrated stable photodegradation characteristics. The significant improvement in the photocatalytic activity and stability of g-C<sub>3</sub>N<sub>4</sub>/Ag<sub>3</sub>PO<sub>4</sub> was attributed to the rapid charge separation between g-C<sub>3</sub>N<sub>4</sub> and Ag<sub>3</sub>PO<sub>4</sub> during the Z-scheme charge transfer and recombination process.
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