resumo
Calcium phosphate based materials of natural origin with photocatalytic properties were produced. Bones of Atlantic cod fish were treated in appropriate solutions (either Ca- or Ti-containing salts) and successively annealed. Results showed multiphasic materials (hydroxyapatite, beta-tricalcium phosphate and anatase titania) with excellent photocatalytic performance under both UV and visible light, with an anatase concentration of only about 2 mol%. Results with such a low amount of anatase have never been reported before for a calcium phosphate-based material; this is attributed to the presence of anatase being mainly on the surface. Single-phase hydroxyapatite (Ca-10(PO4)(6)(OH)(2) or HAp) also showed some photocatalytic properties and antibacterial activity.
palavras-chave
CHEMICAL-VAPOR-DEPOSITION; THIN-FILMS; HYDROXYAPATITE COATINGS; TRICALCIUM PHOSPHATE; UV-IRRADIATION; ANATASE TIO2; PHASE-CHANGE; TITANIA; SURFACE; DECOMPOSITION
categoria
Chemistry; Energy & Fuels; Materials Science
autores
Piccirillo, C; Dunnill, CW; Pullar, RC; Tobaldi, DM; Labrincha, JA; Parkin, IP; Pintado, MM; Castro, PML
nossos autores
David Maria Tobaldi
Investigador
João António Labrincha Baptista
Professor Catedrático
Rob Pullar
Colaboradoragradecimentos
This work was performed under the network iCOD (Inovadora Tecnologias para a Valorizacao de Subproductos do Pocessamento do Bacalhau, funded by FTC, contract QREN AdI I vertical bar 466). This work was also supported by National Funds from FCT - Fundacao para a Ciencia e a Tecnologia - through project PEst-OE/EQB/LA0016/2011. R. C. Pullar would like to thank the FCT Ciencia2008 programme for supporting this work. The authors thank Pascoal and Filhos S. A. for supplying the cod fish bones.