Abstract
A series of stable nano-Ag-doped NH2-MIL-125(Ti) composites (A/M125) were prepared by two facile successive steps: hydrothermal and photo reduction method. The photocatalytic composites were characterized by powder X-ray diffraction (PXRD), scanning and transmission electron microscopy (SEM, TEM), infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS), BET method and UV–visible diffuse reflectance spectroscopy. The results showed that Ag nanoparticles have been evenly distributed on the surface of NH2-MIL-125(Ti) (M125), which as a whole displays good visible-light absorption ability. Further photocatalytic degradation for Rhodamine B (RhB) in the visible light indicated that the photocatalytic rate of the optimal A/M125−20 composite is 2.7 times that of pure M125, and the final degradation rate reaches 97.4 % within 120 min. The subsequent free radical capture experiment showed ·O2¯ and h+ acted as the main reactive species. Moreover, the photocatalytic degradation mechanism was also investigated via electrochemical tests.
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