Journal ArticleDOI
Preparation and characterization of a titanium-substituted hydroxyapatite photocatalyst
TLDR
In this paper, the effects of reaction temperature and titanium concentration on the crystal were investigated by using TEM, XRD, FTIR, ICP and XPS, and the photocatalytic activity of CTHAp was examined by using decomposition of methylene blue (MB).Abstract:
Nanocrystals of titanium-substituted hydroxyapatite (CTHAp) were prepared with Ti4+ concentrations of x = 0, 0.1, 0.2 and 0.5 [x = Ti/(Ca + Ti)] at hydrothermal temperatures of 100, 150, 190 and 230 °C. The effects of reaction temperature and titanium concentration on the crystal were investigated by using TEM, XRD, FTIR, ICP and XPS. The obtained CTHAp crystallites were rod like pure hydroxyapatite phase (about 70 nm in length and 10 nm in diameter), the crystallinity and grain sizes decreased with the increase of XTi, and increased with hydrothermal temperature from 100 to 230 °C. The concentration of Ti4+ near the surface is larger than in the bulk. The photocatalytic activity of CTHAp was examined by using decomposition of methylene blue (MB) and found that CTHAp had good photocatalytic activity under visible light and UV irradiation.read more
Citations
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Hydroxyapatite: A review of syntheses, structure and applications in heterogeneous catalysis☆
TL;DR: In this paper, the synthesis of HAP and its applications in heterogeneous catalysis are abridged in view of its demonstrated prowess and utility in chemical, material and industrial industry.
Journal ArticleDOI
Waste-to-wealth: biowaste valorization into valuable bio(nano)materials
Chunping Xu,Mahmoud Nasrollahzadeh,Maurizio Selva,Maurizio Selva,Zahra Issaabadi,Rafael Luque,Rafael Luque +6 more
TL;DR: This review aims to provide an overview of present trends and future potential in the conversion of residues from different food sectors into valuable bio(nano)materials.
Journal ArticleDOI
Biomedical materials and techniques to improve the tribological, mechanical and biomedical properties of orthopedic implants – A review article
Mahmoud Ibrahim,Mahmoud Ibrahim,Ahmed A. D. Sarhan,Ahmed A. D. Sarhan,Farazila Yusuf,Mohd Hamdi +5 more
TL;DR: In this article, the potential of available metallic alloys and bioactive materials in biomedical implants including different techniques used in depositing bioactive material on metallic implants, such as thermal spraying, electron magnetron sputtering, laser cladding, etc.
Journal ArticleDOI
Substituted Hydroxyapatites with Antibacterial Properties
TL;DR: The present study aims to find a new factor which may improve antibacterial activity while also presenting low toxicity to the human cells through the synthesis of modified apatites and the antibacterial mechanisms of various ions.
Journal ArticleDOI
Cationic Substitutions in Hydroxyapatite: Current Status of the Derived Biofunctional Effects and Their In Vitro Interrogation Methods.
Teddy Tite,Adrian-Claudiu Popa,Liliana Marinela Balescu,Iuliana Maria Bogdan,Iuliana Pasuk,José M.F. Ferreira,George E. Stan +6 more
TL;DR: A comprehensive inventory of the progresses achieved so far is gathered, to allow fellow researchers to compare with ease and filter the best solutions for the cation substitution of HA-based materials and enable the development of multi-functional biomedical designs.
References
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Journal ArticleDOI
Oxidative Power of Nitrogen-Doped TiO2 Photocatalysts under Visible Illumination
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Synergy effect in the photocatalytic degradation of phenol on a suspended mixture of titania and activated carbon
TL;DR: In this article, the photocatalytic degradation of phenol, chosen as an aromatic model molecule, has been performed at room temperature (20°C) in contact with a suspended mixture of titania and activated carbon (AC).
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Effect of the Type of Activated Carbons on the Photocatalytic Degradation of Aqueous Organic Pollutants by UV-Irradiated Titania
TL;DR: In this paper, the photocatalytic degradation of three model pollutants (phenol, 4-chlorophenol, and herbicide 2,4-D) was performed at room temperature in aqueous suspended mixtures of TiO2 and of two different activated carbons (AC) of commercial origin.
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Preparation of magnesium-substituted hydroxyapatite powders by the mechanochemical-hydrothermal method.
Wojciech L. Suchanek,Kullaiah Byrappa,Pavel Shuk,Richard E. Riman,Victor F. Janas,Kevor S. Tenhuisen +5 more
TL;DR: It was determined that the purified powders were phase-pure Mg-HAp containing 0.24-28.4 wt% of Mg, slightly lower near the surface than in the bulk of the HAp crystals as indicated by X-ray photoelectron spectroscopy.
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Photocatalytic degradation of phenol on MWNT and titania composite catalysts prepared by a modified sol–gel method
TL;DR: In this article, a modified sol-gel method was used to extract multi-walled carbon nanotubes (MWNT) and nanocrystalline titania composite catalysts, and a correlation exists between the MWNT content and the changes in the UV-vis absorption properties.