A comparative study of the photocatalytic efficiency of metal oxide/hydroxyapatite nanocomposites in the degradation kinetic of ciprofloxacin in water

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.

Recent advances in removal of pharmaceutical pollutants in wastewater using metal oxides and carbonaceous materials as photocatalysts: a review

“…The presence of ciprofloxacin in water acts as pollutant and can be removed by means of a photocatalytic approach. 425–524…”

“…In recent years, several studies have been reported on the photodegradation of ciprofloxacin using a variety of composite materials. 460–471 A graphitized mesoporous carbon–TiO 2 nanocomposite facilitated an almost complete photocatalytic performance in the degradation of ciprofloxacin under UV irradiation. 460 A Co/Mn oxide photocatalyst (1.00 g L −1 ) prepared by a sol–gel method displayed maximum discoloration (56.3%) of ciprofloxacin (10.00 mg L −1 ) in water (pH: 4) at about 120 min under sunlight.…”

“…Metal oxide/hydroxyapatite, 469 CuFe 2 O 4 @methyl cellulose, 470 TiO 2 -modified Bi 2 MoO 6 471 and Ag 2 O/Ag 2 CO 3 /MWNTs 472 have also been examined successfully as composite photocatalysts for the enhancement of ciprofloxacin degradation in water under UV, UVC and visible light, respectively.…”