Tunable photocatalytic selectivity of fluoropolymer PVDF modified TiO_2

摘要

Fluoropolymer poly-vinylidene-fluoride modified TiO_2 (PVDF/TiO_2) were prepared via a simple chemisorption approach and characterized by thermo gravimetric analyse, transmission electron microscope, X-ray diffraction, X-ray photoelectron spectroscopy and photoluminescence spectra. The modified mechanism and the photocatalytic selectivity of the PVDF/TiO_2 were studied. The existence of Ti-F coordination bond on the interface between TiO_2 and PVDF was confirmed. For the PVDF modification, the photocatalytic degradation (PCD) of cationic dye was greatly enhanced, and the PCD of anionic dye was obviously inhibited. PVDF/TiO_2 shows high photocatalytic selectivity than that of TiO_2 by degrading mixed solution of cationic dyes MB and anionic dyes MO. The selectivity can be tuned by changing the PVDF modification amount.