标题：Préparation et évaluation de l’efficacité photocatalytique du Hydroxyapatite - Titane vis-à-vis du colorant Acide Orange 7 en milieu aqueux (Preparation and photocatalytic efficiency evaluation of Hydroxyapatite - Titanium toward Orange Acid 7 dye in aqueous medium
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2014
卷号：5
期号：5
页码：1573-1582
出版社：University of Mohammed Premier Oujda
摘要：In this work, the degradation of Orange Acid 7 (OA7) d ye by heterogeneous photocatalysis using a non -stoichio metric hydroxyapatite doped with titanium was investigated. First, the developed catalyst was characterized by different analytical techniques such as XRD, FTIR and TGA-DTA. Its effectiveness in degrading OA7 dye was then studied in a batch reactor. The effect of several parameters such as concentration, pH and irradiation time on photodegradation efficiency was investigated. Obtained results sho w that composite material HAP-Titanium has a significant photocatalytic activity; complete discoloration of dying solution can be achieved after 16 hours of irradiation. Results show that discoloration performance depends on the catalyst mass, its titanium content, the initial d ye co ncentration and the presence of oxygen in medium. However, photodegradation is little affected b y the variation of pH of treated solutions. Increasing the mass o f the catalyst and its percentage of titanium improves co nsiderably the efficiency and the speed of discoloration. The optimum mass of the catalyst HAP-Titanium (Ti 11%) is about 2 g per liter of solution. Obtained results also show that discoloration yield decreases by increasing the initial concentration of dye and that the presence o f oxygen in medium improves further the phodegradation phenomenon.
