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Comparison of natural adsorbents for metal removal from acidic effluent.

Blais, Jean-François; Shen, Shaobo; Meunier, Nathalie; Tyagi, Rajeshwar Dayal (2003). Comparison of natural adsorbents for metal removal from acidic effluent. Environmental Technology , vol. 24 , nº 2. p. 205-215. DOI: 10.1080/09593330309385552.

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Résumé

Adsorption tests were carried out in acidic synthetic solutions (pH 2.0) using 20 g 1-1 of various natural adsorbents and 0.25 mM of 11 different metals. In decreasing order, the most efficient adsorbents tested were: oyster shells, cedar bark, vermiculite, cocoa shells and peanut shells. In contrast, weak metal adsorption was demonstrated by: red cedar wood, peat moss, pine wood, corn cobs and perlite. Metal adsorption capacities in acidic synthetic solution followed the order Pb2+> Cr3+> Cu2+> Fe2+> A13+> Ni2+> Cd2+> Mn2+> Zn2+>> Ca2+, Mg2+. Alkaline treatment (0.75 M NaOH) increased the effectiveness of metal removal for the majority of adsorbents. In contrast, acid treatment (0.75 M H2SO4) either reduced or did not affect the adsorption capacity of the materials tested. Finally, oyster shells, red cedar wood, vermiculite, cocoa shells and peanut shells, were effective natural adsorbents for the selective recovery of lead and bivalent chromium from acidic effluent.

Type de document: Article
Mots-clés libres: metal; removal; adsorbent; effluent; acid
Centre: Centre Eau Terre Environnement
Date de dépôt: 08 janv. 2021 13:53
Dernière modification: 08 janv. 2021 13:53
URI: http://espace.inrs.ca/id/eprint/11080

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