Abstract
Photocatalytic TiO 2 films were coated on Al fiber by sol–gel dip-coating method, and then annealed. The crystal structure and morphology of the films were performed by XRD, TEM and SEM. Photocatalytic sterilization of the films was investigated in O 2 atmosphere through purifying the aqueous solution with facultative aerobe ( Bacillus cereus), aerobe ( Pseudomonas aeruginosa) and anaerobe ( Staphylococcus aureus, Enterococcus faecalis and Escherichia coli). In the presence of O 2, it benefits to generate O 2 − and OH at the first stage of the photocatalytic reaction, while the excess O 2 restrains the anaerobe from reproducing and accelerates the reproducing for the aerobe at the second stage of reaction. As a result, it was found that the crystal of TiO 2 films is anatase phase and the films have excellent sterilization effect against facultative aerobe and anaerobe. Nevertheless, it only decreased the bioactivity against aerobe in a short time.
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