Preparation of photo-catalysis TiO2 films by combined plasma surface treatment

TiO2 films with excellent bonding strength were fabricated on stainless steel substrate by plasma surface alloying and thermal oxidation duplex processing. Controllable elemental distribution and structure of the films could be achieved at 400-600 degree C. The films were characterized by metallography, glow discharge spectrometer (GDOES) and X-ray diffraction. The results show that the TiO2 films are of dense and uniform anatase. The Ti and O contents of the films are in gradient distribution. Phenol-containing wastewater was used to test photo-catalytic performance of the films. The TiO2 films have a degradation rate of phenol of about 73.5% in 3 h, much higher than commercial products of TiO2 powders. (authors)