Preparation and Photocatalytic Performance of Bi and Co Doped TiO2 Ceramic Films

Abstract: Bi-TiO2 and Co-TiO2 composite films applied on the fixed photocatalytic reactor were prepared on ceramic substrate by sol-gel method, with the titanium source of tetrabutyl titanate, the Bi source of Bi(NO3)3·5H2O and the Co source of Co(NO3)2·6H2O. The effects of coating processes and heating rates of calcination on the surface morphology of the films were studied.The photocatalytic activity of the films prepared by spin-coating method and dip-coating method at different heating rates was compared with methyl orange solution. The structures of the films were conducted by TG-DSC, XRD and SEM tests. The results show that Bi or Co ion doping are beneficial to the phase transformation of amorphous TiO2 to anatase TiO2.The results show that the films prepared by spin-coating method are closely bonded to the ceramic substrate, while the films prepared by dip-coating method have higher catalytic activity. When the calcination temperature is 500 ℃ and the heating rate is 10 ℃/min, the degradation rate of methyl orange is higher. When the atom mole ratio is 0.010, the photodegradation of methyl orange catalyzed by the Bi-TiO2 films is up to 8.10% after 100 min reactions. Co or Bi ion-doped process are able to improve the photocatalytic activity of the TiO2 catalyst and the catalytic activity of Bi-TiO2 films is better than that of Co-TiO2 films.

Key words: photocatalytic reactor, sol-gel method, Bi-TiO2 composite film, Co-TiO2 composite film, ion doping modification, methyl orange

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