Composite photocatalysts of CuO/CoFe2O4-TiO2 were successfully synthesized by a sol-gel method and fixed on ordinary tiles. The photosterilization of Escherichia coli was examined on CuO/CoFe2O4-TiO2 thin films under a xenon lamp irradiation. The film was characterized by XRD, and the morphology was observed by SEM. Disinfection data indicated that CuO/CoFe2O4-TiO2 composite photocatalysts have the much better photocatalytic activity than CuO/CoFe2O4 and TiO2. The optimized composition of the nanocomposites has been found to be mCuO/CoFe2O4∶mTiO2=3∶7, with loadings ranging from 790 to 1400 mg/m2. The photocatalytic inactivated rate of E. coli (105 CFU/mL) reached 98.4% under the xenon lamp of 150 W within 30 min.
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