Preparation and properties of hydroxyapatite/titania composite for microbial filtration application

Abstract

A series of TiO₂ modified hydroxyapatite composites (HA/TiO₂) with different compositions were prepared. Phase formations and morphologies of the obtained HA/TiO₂ composite were characterised using X-ray diffraction and SEM, and their photocatalytic activities were also determined by decomposition of methylene blue solution. Filter cloths were prepared by depositing the composite on polyester non-wovens via pad dry cure, and their filtering effectiveness was examined by photocatalytic activity measurement and bactericidal test. Hydroxyapatite/TiO₂ composites were successfully prepared and exhibited photocatalytic properties. With increasing ratio of anatase titania in the HA/TiO₂ composite from 20 to 30 and 50%, photocatalytic activity of composite material increased such that HATi5050 composite exhibited the highest photocatalytic activity. Non-woven filters coated with HA/TiO₂ composites also exhibited good photocatalytic activities. Less difference in photocatalytic activity between HATi7030 and HATi5050 coated non-woven filters was observed, compared to that in powder form. The filter coated with HA/TiO₂ composite exhibited good bactericidal effect.

Keywords

Hydroxyapatite Titanium dioxide Antibacterial Photocatalytic activity

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