Resumo

TEJADA TOVAR, Candelaria; VILLABONA ORTIZ, Angel  e  RUIZ PATERNINA, Erika. Adsorption kinetics of Cr (VI) using chemically modified residual biomass in batch and continuous systems. Rev. ion [online]. 2015, vol.28, n.1, pp.29-41. ISSN 0120-100X.

It was studied the adsorption of Cr (VI) from lignocellulosic residual biomass: bagasse palm and yam peels. Also, it was studied a modification with citric acid into biomasses to improve the efficiency of metal adsorption. Determinating this metal in solution was performed using the colorimetric method 1,5-diphenylcarbazide. From FTIR analysis and characterization adsorbents before and after the process of removal of Cr (VI) was found that hydroxyl and carbonyl groups contribution to take up this process. Modification into biomasses accord to Langmuir isotherm improves the adsorption efficiency. It was improved from 13 to 41mg/g for bagasse palm, and from 22 to 26mg/g for yam peels. In continuous systems, this process was improved. Optimal condition to remove this metal was determined in pH 2 and particle size of 1mm for both biomasses. It is also the Elovich kinetic the best model to describe the adsorption process.

Palavras-chave : adsorption; citric acid; hexavalent chromium; residual biomass.

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