In this work, a series of Z-scheme Ag/Ag 2 WO 4 /g-C 3 N 4 (AAC) photocatalysts were successfully constructed by the deposition–precipitation method at room temperature. The phase, structure, morphology and optical property of the as-prepared photocatalysts were well characterized. Interestingly, all AAC exhibited prominent photocatalytic activity for Rhodamine B (RhB) degradation under visible light illumination. Especially, AAC-3 possessed the higher RhB degradation rate ( k = 0.1855 min −1 ). More remarkably, when H 2 O 2 (1 mL 0.0977 mol/L) was dissolved into reaction system, the degradation rate of RhB was further improved ( k = 0.7899 min −1 ), which could be mainly attributed to the high separation rate of photogenic carriers and more active species. Meanwhile, a feasible photocatalytic reaction mechanism was proposed and discussed in detail.
Introducing plasmonic metals into semiconductor materials has been proven to be an attractive strategy for enhancing photocatalytic activity in the visible region. In this work, a novel and efficient Ag/Ag 2 WO 4 /g-C 3 N 4 (AACN) ternary plasmonic photocatalyst was successfully synthesized using a facile one-step in situ hydrothermal method. The composition, structure, morphology and optical absorption properties of AACN were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and UV–visible diffuse reflectance spectroscopy, respectively. Photocatalytic performance of AACN was evaluated via rhodamine B and tetracycline degradation. The results indicated that AACN had excellent photocatalytic performance for rhodamine B degradation with a rate constant of 0.0125 min −1 , which was higher than those of Ag 2 WO 4 and Ag/Ag 2 WO 4 . Characterization and photocatalytic tests showed that the strong coupling effect between the Ag/Ag 2 WO 4 nanoparticles and the exfoliated ultrathin g-C 3 N 4 nanosheets was superior for visible-light responsivity and reduced the recombination rate of photogenerated electrons and holes. A proposed mechanism is also discussed according to the band energy structure and the experimental results.
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