The aim of this study was the filtration of microbes in air using a hydroxyapatite (HAp)-coated filter. The HAp powder was synthesised using CaCO3 and H3PO4 at 1350 degrees C. The microstructure of the HAp-coated filter prepared via a spraying method was evaluated by scanning electron microscopy (SEM), and it was found that the HAp particles on the surface of the filter formed a compact coating. We tested the apparent density and tensile strength of the coated filter according to the requirements of the Korean Standards Association. The apparent density of the coated filter was 369.25 g cm(-3). Tensile strength of length and width section was 280 N and 270 N, respectively. The absorbability of the coated filter was tested to investigate whether HAp was capable of removing bacteria and viruses. A solution of 1% HAp particles displayed 90-99% absorbability. Finally, the antibacterial activity was evaluated, which demonstrated that the coated filter completely removed E. coli.

Keywords: Hydroxyapatite; Disc diffusion assay; Clear zone; Absorbability; Antibacterial