Abstract
The heterojunctions formed at the interfaces between the metal oxide and graphitic carbon nitride (g-C3N4) play a critical role in photocatalytic reactions. Herein, we synthesized a series of heterostructures by the integration of 7% Ag-decorated ZnO nanocomposite (NC) with different contents (3.5–75 wt%) of sulphur-doped graphitic carbon nitride (S-g-C3N4). A unique heterostructure formed between Ag/ZnO and S-g-C3N4 generates a vast number of heterojunctions and abundant catalytic active sites for photocatalytic degradation. The material characterization was performed by XRD, SEM, TEM, XPS, FTIR, UV-Vis spectroscopy, BET surface area, and transient photocurrent response. The as-synthesized 7% Ag/ZnO NC showed maximum methylene blue (MB) degradation among the series (0–9%) under visible irradiation. Interestingly, the 25% Ag/ZnO/S-g-C3N4 heterostructure exhibited a significant increase in photodegradation of MB and 98% dye degraded in only 60 min, which was degraded up to 59% by 7% Ag/ZnO NC. Moreover, the photo-corrosion of ZnO NPs was inhibited by simultaneous doping with Ag and coupling with S-g-C3N4, which was verified through cyclic photo-degradation with six consecutive dye degradation tests. The synergistic effects of the Ag/ZnO/S-g-C3N4 heterojunction, enhanced photocatalytic activity, and photo-corrosion resistance were demonstrated successfully.
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