Fabrication of titania/hydroxyapatite composite granules for photo-catalyst

Journal Article · Thu Apr 02 04:00:00 EDT 2009 · Materials Research Bulletin

OSTI ID:21199723

Murakami, Setsuaki; Kamitakahara, Masanobu; Ioku, Koji ^[1]

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1. Graduate School of Environmental Studies, Tohoku University, Aoba 6-6-20 Aramaki, Aoba-ku, Sendai 980-8579 (Japan)

The titania/hydroxyapatite composite granular photo-catalyst with novel microstructure was fabricated by the process based on the liquid immiscibility effect and followed by precalcination and hydrothermal treatment from commercially available powders of {alpha}-Tri-calcium phosphate and TiO{sub 2}. XRD, SEM, BET, optical microscopy and UV-vis spectrophotometer were applied to characterize the prepared photo-catalyst. Microstructure analysis indicated that the granule was weaved by rod-shaped hydroxyapatite crystals whose surface was covered by nano-sized TiO{sub 2}. In the composite granules, the active surface of anatase was retained effectively. With the hybridization of TiO{sub 2} and HAp, a 16-nm blue-shift of absorption edge could be observed and the crystallinity of anatase could be enhanced by precalcination. The granules with the rod-shaped hydroxyapatite crystals performing as scaffold work as three-dimensional high porous, size-controllable small reactor. The phase and microstructure transformation of the granule before and after hydrothermal treatment was investigated and its decomposition ability was evaluated by using Methylene blue as a target pollutant compound.

• OSTI ID: 21199723
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
APATITES
CALCIUM PHOSPHATES
CATALYSTS
CRYSTAL GROWTH
DECOMPOSITION
FABRICATION
METHYLENE BLUE
MICROSTRUCTURE
NANOSTRUCTURES
OPTICAL MICROSCOPY
POROUS MATERIALS
POWDERS
SCANNING ELECTRON MICROSCOPY
SPECTROPHOTOMETERS
SURFACES
TITANIUM OXIDES
X-RAY DIFFRACTION