Abstract
The photocatalytic efficiency of the metal oxide-hydroxyapatite photocatalysts prepared by soft chemistry using phosphate rock as calcium and phosphorus precursors has been investigated on the degradation kinetic of ciprofloxacin residues in water under UV-light (HPK125 W Lamp). The nature of metal oxide (TiO2, ZnO, Fe2O3), structure, surface area and pore-size distributions of the catalysts were analyzed by various techniques analyses. Association of nanoscale metal oxide with hydroxyapatite could enhance the sorption properties of the materials and confers them interesting photodegradation properties. The results of the kinetic study revealed that the activities of these photocatalysts were dependent on the oxide surface and the best activity was obtained with TiO2/hydroxyapatite catalyst, which had the largest surface area. The effects of various operational parameters were thoroughly considered in order to achieve highest photodegradation efficiency. A correlation between the nature of associated metal oxide, surface properties, the sorption behavior and the photodegradation capacity of these composites could be establishedd.
Highlights
The results of the kinetic study revealed that the activities of these photocatalysts were dependent on the oxide surface and the best activity was obtained with TiO2/hydroxyapatite catalyst, which had the largest surface area
Its association with The pure hydroxyapatite powder (HAp) was prepared by metal oxides such as titanium, zinc and iron inhibits a dissolution/reprecipitation method from a natural novel properties of composites formed, if phosphate ore coming from the Bengurir region apatite is prepared from natural phosphate as a low-cost (Morocco) [7]
At different reaction times (t), aliquots of the supernatant solution were taken with a 2 mL propylene syringe equipped with a 0.45 μm filter and the equilibrium concentration of residual ciprofloxacin qt was measured by UV-visible spectroscopy and controlled by High Performance Liquid Chromatography (HPLC) for information on the by-products formed
Summary
The results of the kinetic study revealed that the activities of these photocatalysts were dependent on the oxide surface and the best activity was obtained with TiO2/hydroxyapatite catalyst, which had the largest surface area. Photodegradation on metal oxides such as TiO2 depends on the performance of the processes used and the nature of the photoactive as well as the operating conditions [8].
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