Novel Carbon-Modified Photocatalyst Films and Method for Producing Same

Abstract

A novel carbon-modified titanium dioxide film (CMF-TiO2) and a method for producing same by a CVD method at atmospheric pressure. The precursor compounds used in this context for the titanium dioxide and the carbon component are titanium-organic compounds and unsaturated aromatic hydrocarbons. Thermal treatment at about 250° C. to about 600° C., preferable at about 250° C. to about 300° C. forms a CMF-TiO2, the carbon content of which is about 0.2% to about 10.0% by weight, preferably about 0.2% to about 6.0% by weight and particularly preferably about 0.2% to about 2.5% by weight. A CMF-TiO2 film is characterised by high catalytic activity in the degradation of air and water pollutants with visible light and light absorption in the range from 400 nm to 700 nm, as well as by 1) a quasi-Fermi level of the electrons of −0.5 V at pH 7 (relative to NHE) and/or by 2) C1s bonding energies of 284.8, 286.3 and 288.8 eV; and/or by 3) an isotropic electronic spin resonance (ESR) signal at a g-value of 1.900 to 2.005.

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