Composite hydroxyapatite/TiO2 materials for photocatalytic oxidation of NOx

This item is provided by the institution :
University of Ioannina
Repository :
Repository of UOI Olympias
see the original item page
in the repository's web site and access all digital files if the item*

2012 (EN)
Composite hydroxyapatite/TiO2 materials for photocatalytic oxidation of NOx (EN)

Giannakopoulou, T. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)
Giannakopoulou, T. (EN)

Hydroxyapatite/TiO2 composite photocatalysts were obtained from sol-gel prepared TiO2 and commercial hydroxyapatite (HA) powders. Composites with different HA/TiO2 ratio were studied to assess the influence of HA on the morphology and the photocatalytic behavior of the materials. Morphological SEM analysis revealed that the presence of HA diminishes the aggregation of TiO2 particles and leads to their higher dispersion in the composites that was confirmed by the N-2 adsorption-desorption isotherms and Barret-Joyner-Halenda analysis. The photocatalytic activity of the prepared catalysts was examined by monitoring photocatalytic oxidation of NOx model gases over catalysts under UV illumination. The NOx oxidation over the composite catalysts was improved in comparison with pure TiO2 powder. Moreover, the decrease of the TiO2 content, which is the photocatalytically active component in the composites, resulted in enhanced NOx removal. Maximum activity was recorded for composites with HA/TiO2 ratios 1 and 2 that was related to improved TiO2 dispersion and NO2 trapping by the composite materials. (C) 2012 Elsevier B.V. All rights reserved. (EN)

composite materials (EN)

Πανεπιστήμιο Ιωαννίνων (EL)
University of Ioannina (EN)

Materials Science and Engineering B-Advanced Functional Solid-State Materials (EN)


<Go to ISI>://000309313000006

*Institutions are responsible for keeping their URLs functional (digital file, item page in repository site)