Copper and lead-immobilization by porous

hydroxyapatite in aqueous solutions

 

L. El Hammari1, A. LaghziziL1*, A. Saoiabi1, P.Barboux2, R. Guilard3

1Laboratoire de Chimie physique Générale, Faculté des Sciences, Université Mohammed V,  BP.1014 Rabat, Maroc

2 LCAES- Chimie de la Matière Condensée, Ecole Nationale Supérieure de Chimie de Paris-France

3Laboratoire d’Ingénierie Moléculaire pour la Séparation et les Applications des Gaz,

Faculté des Sciences Gabriel, Université de Bourgogne, Dijon, France

* Corresponding author. E-mail: laghzizi@fsr.ac.ma

Received: 26 June 2008; revised version accepted: 26 October 2008

 

Abstract

     The porous hydroxyapatite with high specific area (235 m2/g) can be considered as potential agents to treat the heavy metals contaminated soils and waters. The adsorption experiments indicate that the addition of porous hydroxyapatite (HAp) to Cu and Pb contaminated waters has better adsorption property than that of the crystalline hydroxyapatite (CAp). The maximum adsorption capacity for Cu2+ and Pb2+ ions at room temperature is 2.01 mmol/g and 2.30 mmol/g respectively for HAp compared to 1.06 and 1.38 mmol/g for the commercial compound CAp. The change in adsorbing behaviors between these two materials is related to the high specific surface area of HAp and to its structural disorder.

 

Keywords: Calcium hydroxyapatite; heavy metal immobilization; adsorption; Wastewaters; Equilibrium; Kinetics; Isotherms.


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