Abstract
For developing and utilizing near-infrared (NIR) energy in sunlight, NaYF4:Yb,Tm (NYFYT) up-conversion luminescent powder was combined with Ag3PO4 (AP) and Ag3PO4/Pt nanoparticles (AP/PtNPs) as a photocatalyst. Driven by NIR light, NYFYT produces up-conversion emission at 348, 364, 453 and 478 nm, effectively stimulating the photocatalytic degradation performance of AP and AP/PtNPs. Under xenon lamp irradiation, the apparent rate constants (k) for Ag3PO4/Pt nanoparticles-NaYF4:Yb,Tm (AP/PtNPs-NYFYT) in photocatalytic degradation of rhodamine B (Rh B) and phenol are 5.51 and 12.82 times higher than those of AP and 1.90 and 2.37 times higher than those of AP-NYFYT-50 wt%, respectively. In addition, under 980 nm laser irradiation, rate constants are 3.26 and 4.16 times higher than those of AP-NYFYT-50 wt%, respectively. These results indicate that the combination of NYFYT and AP expands the absorption range of the composite photocatalyst and facilitates the NIR-driven photocatalytic process. The introduction of PtNPs effectively prevents the electron-hole recombination and the reduction of Ag+, accelerating the redox reaction and promoting the photocatalytic activity and stability of AP.
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