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Cocoa Shells as Adsorbent for Metal Recovery from Acid Effluent.

Blais, Jean-François; Tyagi, Rajeshwar Dayal; Fiset, Jean-François (2002). Cocoa Shells as Adsorbent for Metal Recovery from Acid Effluent. Water Quality Research Journal , vol. 37 , nº 2. p. 379-388. DOI: 10.2166/wqrj.2002.024.

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Résumé

Cocoa shells are commonly used in the horticulture field. This inexpensive substrate was studied for metal removal from acidic effluents. Batch adsorption tests in shake flasks revealed that cocoa shells were particularly efficient for lead removal. More than 90% of lead could be removed from a mono-metallic solution containing 51.8 mg Pb/L (250 µM Pb) using 20 g/L of cocoa shells. Langmuir isotherm indicated that cocoa shells have a maximum lead uptake of 7.56 mg/g (36.5 µmol/g) at pH = 2.0. Adsorption tests were also successfully completed with three types of heavily contaminated acid effluents: a multi-element synthetic solution and effluents produced during sewage sludge and soil decontamination. These tests have shown that the presence of other metals and organic matter only slightly decreases the lead removal by cocoa shells. After adsorption, metals could be eluted using a diluted acid solution (0.5 N) and the cocoa shells could be reused for many adsorption/desorption cycles.

Type de document: Article
Mots-clés libres: cocoa shells; metals; adsorption; lead; metal removal; acid effluent
Centre: Centre Eau Terre Environnement
Date de dépôt: 11 janv. 2021 15:52
Dernière modification: 11 janv. 2021 15:52
URI: http://espace.inrs.ca/id/eprint/11098

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