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Title:
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Experimental evidences for a new model in the description of the adsorption-coupled reduction of Cr(VI) by protonated banana skin
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Author:
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López García, Marta; Lodeiro, Pablo; Herrero, Roberto; Barriada, José L.; Rey Castro, Carlos; David, Calin; Sastre de Vicente, Manuel E.
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Notes:
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This work reports experimental evidences, not previously considered, to evaluate the Cr(VI) removal by
protonated banana skin biomass. Variations in the number of hydroxyl groups, quantified by potentiometric
titrations, and CO2 evolution during experiments, were attributed mainly to the oxidation of
hydroxylic entities present in the studied material. The results indicate that these groups together with
the carboxylic moieties are the main functionalities involved on the adsorption-coupled reduction process.
The column experiment carried out provides a new approach to obtain the maximum reduction
capacity of the material (3.72 mmol g 1). Moreover, we hereby propose a model that reports the first evidence
for the instant bound of Cr(III) species to the material used, formed after the reduction of Cr(VI)
present in solution. The removal process was quantified carrying out experiments under various pHs, biomass
doses and Cr(VI) concentrations, and the mechanism underlying chromium removal was identified.
This work was funded by the projects CTM2012-37272 (Ministerio de Economía y Competitividad of Spain) and PGDIT06TAM0 0401CT (Xunta de Galicia). P. Lodeiro gratefully acknowledges financial support through Ángeles Alvariño project AA 10.02.56B.444.0 and the grant for research stay 10.02.561B.480.0 (Xunta de Galicia) both co-funded by 80% with European Social Funds. |
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Subject(s):
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-Chromium
-Banana skin
-Adsorption-coupled reduction
-Bananes |
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Rights:
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(c) Elsevier, 2013
info:eu-repo/semantics/restrictedAccess |
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Document type:
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article
publishedVersion |
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Published by:
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Elsevier
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