title: Hydroxyapatite-based sorbents: elaboration, characterization and application for the removal of catechol from the aqueous phase.
abstract: Hydroxyapatite (HAP) is highly considered as good sorbent for the removal of metals from the aqueous phase. However, soluble metals co-exist with organic pollutants in wastewaters. But little work has been devoted to investigate the reactivity of HAP for the removal of organic compounds. The main objective of this work is to study the reactivity of HAP-based sorbents for the removal of catechol as a model organic pollutant from an aqueous solution. Thus, HAP sorbents were firstly synthesized using calcium carbonate and potassium dihydrogen phosphate under moderate conditions (25-80°C, atmospheric pressure). A zinc-doped HAP was also used as sorbent, which was obtained from the contact of HAP with an aqueous solution of zinc nitrate. All the sorbents were characterized by different standard physico-chemical techniques. The sorption of catechol was carried out in a batch reactor under stirring at room temperature and pressure. Zinc-doped HAP sorbent was found to be more reactive than non-doped HAP sorbents for the fixation of catechol. The highest sorption capacity was of 15 mg of C per gram of zinc-doped HAP sorbent. The results obtained suggest the reaction scheme of HAP sorbents with metals and organic pollutants when HAP sorbents were used for the treatment of complex wastewaters.
authors.affiliation: a Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE , Albi Cedex 09 , France.
authors.forename: Haroun
authors.initials: H
authors.lastname: Sebei
authors.affiliation: a Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE , Albi Cedex 09 , France.
authors.forename: Doan
authors.initials: D
authors.lastname: Pham Minh
authors.affiliation: a Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE , Albi Cedex 09 , France.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Lyczko
authors.affiliation: a Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE , Albi Cedex 09 , France.
authors.forename: Patrick
authors.initials: P
authors.lastname: Sharrock
authors.affiliation: a Université de Toulouse, Mines Albi, CNRS, Centre RAPSODEE , Albi Cedex 09 , France.
authors.forename: Ange
authors.initials: A
authors.lastname: Nzihou
mesh_terms: D000327:Adsorption; D002396:Catechols / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D008670:Metals; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
chemical_list: D002396:Catechols; D017886:Durapatite; D008670:Metals; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Hydroxyapatite; catechol; mechanism; sorption; wastewater treatment