Resumo

TEJADA-TOVAR, Candelaria et al. PARAMETER OPTIMIZATION FOR Cr(VI) ADSORPTION BREAKDOWN CURVES ONTO COCOA SHELL. rev.udcaactual.divulg.cient. [online]. 2018, vol.21, n.1, pp.167-177. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v21.n1.2018.675.

The aim of the present investigation was to evaluate the cocoa shell (Theobroma cacao L.) for its use in the adsorption of hexavalent chromium in aqueous solution using packed bed column, applying the surface response method (SRM) in order to determine the optimum values of the variables involved in the process. The adsorption tests were carried out with these values. Was used a central composite experiment design with star points. The biomass was washed, dried, decreased size and sieved; the experiments were carried out at 25°C, at different particle sizes, flow rate and amount of biomass, in columns in continuous system; obtaining a percentage of removal of 39.16% of C (VI). Was obtained when performing the experiments in batch system that at a size of 0.355mm particle favors the adsorption. From the adsorption tests in the column using the optimum parameters obtained by the MSR, was obtained a removal percentage of 62.65%; finding that the models of Yoon-Nelson and Thomas were those that adjusted the experimental data of the rupture curve, with R2 =0.98. It’s concluded that the cocoa shell is a good precursor of bioadsorbents and that the most influential variables in Cr (VI) adsorption in batch and continuous systems are particle size and bed height.

Palavras-chave : Biomass; fixed bed column; chromium hexavalent; response surface method..

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