Visible-light responsive dye-modified TiO{sub 2} photocatalyst
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001 (China)
A series of dye-modified TiO{sub 2} photocatalysts were synthesized using dye Chrysoidine G (CG), tolylene-2,4-diisocyanate (TDI), and commercial TiO{sub 2} (Degussa P25) as starting materials. TDI was used as a bridging molecule whose two -NCO groups reacted with Ti-OH of TiO{sub 2} and -NH{sub 2} groups of CG, respectively. As a result, special organic complexes were formed on the TiO{sub 2} surface via stable {pi}-conjugated chemical bonds between TiO{sub 2} and dye molecules, confirmed by FT-IR, XPS, and UV-vis spectra. Due to the existence of {pi}-conjugated surface organic complexes, the as-synthesized photocatalysts showed a great improvement in visible absorption (400-550 nm). Methylene blue, as a photodegradation target, was used to evaluate the photocatalytic performance, and the dye-modified TiO{sub 2} exhibited much better activity under the visible light irradiation than bare TiO{sub 2}. - Graphical abstract: Dye-modified TiO{sub 2} photocatalysts were synthesized via the reaction between Chrysoidine G (CG), Degussa P25 (TiO{sub 2}), and tolylene-2,4-diisocyanate (TDI) as a bridging molecule. As a result, {pi}-conjugated surface organic complexes were formed on TiO{sub 2} surface. Due to the existence of organic complexes, dye-modified TiO{sub 2} catalysts showed great visible absorption and high activity under the visible light irradiation.
- OSTI ID:
- 21043929
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 3 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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