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Article Dans Une Revue Chemical Engineering Journal Année : 2012

Lead and zinc removal from aqueous solutions by aminotriphosphonate-modified converted natural phosphates

Résumé

Apatite particles prepared from natural phosphate rock and grafted with nitrilotris(methylene)triphosphonate (NTP) were evaluated for Pb2+ and Zn2+ sorption from aqueous solutions. Sorption capacities as high as 640 mg g(-1) and 300 mg g(-1) could be obtained for the highest organic content (10 wt.%). Analysis of the sorption isotherms using Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich models revealed that Pb2+ ions have a larger affinity for apatite (sorption energy approximate to 8 kJ mol(-1)) than for NTP so that organo-modified surfaces led to a heterogenous adsorption process. In contrast, Zn2+ interacts weakly (sorption energy approximate to 1 kJ mol(-1)) and similarly with the mineral surface and the organic moieties following a homogenous sorption process. Such an association of organic metal ligands with reactive apatite surfaces within porous materials appears as a promising strategy to obtain efficient adsorbents at low cost and limited environmental impact.

Domaines

Matériaux

Dates et versions

hal-01461432 , version 1 (08-02-2017)

Identifiants

Citer

S. Saoiabi, S. El Asri, A. Laghzizil, A. Saoiabi, J. L. Ackerman, et al.. Lead and zinc removal from aqueous solutions by aminotriphosphonate-modified converted natural phosphates. Chemical Engineering Journal, 2012, 211, pp.233-239. ⟨10.1016/j.cej.2012.09.017⟩. ⟨hal-01461432⟩
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