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Effect of conditions for preparation of cyclized polyacrylonitrile sensitized TiO2 nanoparticles on visible-light photocatalysis and photo absorbance property

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Abstract

Cyclized polyacrylonitrile (CPAN) sensitized titanium dioxide (TiO2) nanoparticles were prepared by dip method. Photocatalysis and photo absorbance property of TiO2/CPAN were measured. The photocatalytic activity of the nanocomposites was evaluated by decomposition of an ordinary dye Reactive Brilliant Red X-3B in an aqueous solution under visible light irradiation. Results show that TiO2/CPAN nanocomposites with CPAN content of 0.5% have the highest photocatalytic activity. The optimum cyclized temperature is 300°C, and cyclized time is 1 h. Ultraviolet-visible diffuse reflectance spectra indicate the photo absorbance property of TiO2/CPAN nanoparticles in the range of visible light is higher than that of TiO2 nanoparticles. Fluorescence spectra indicate that introduction of trace CPAN onto TiO2 nanoparticles can efficiently decrease the recombination probability of photo-generated electrons and holes, so the visible light photocatalysis of TiO2/CPAN nanocomposites is significantly improved. The morphology and microstructure of TiO2 and TiO2/CPAN nanocomposites were characterized by transmission electron microscopy and X-ray diffraction. Results show that the size of TiO2/CPAN nanocomposites is similar to that of TiO2 nanoparticles. © 2014 American Institute of Chemical Engineers Environ Prog, 34: 32–38, 2015

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