Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

New Bioadsorbent Derived from Winemaking Waste Cluster Stalks: Application to the Removal of Toxic Cr(VI) from Liquid Effluents

Version 1 : Received: 29 October 2020 / Approved: 30 October 2020 / Online: 30 October 2020 (08:28:29 CET)

How to cite: Alcaraz, L.; Alguacil, F.J.; López, F.A. New Bioadsorbent Derived from Winemaking Waste Cluster Stalks: Application to the Removal of Toxic Cr(VI) from Liquid Effluents. Preprints 2020, 2020100627 (doi: 10.20944/preprints202010.0627.v1). Alcaraz, L.; Alguacil, F.J.; López, F.A. New Bioadsorbent Derived from Winemaking Waste Cluster Stalks: Application to the Removal of Toxic Cr(VI) from Liquid Effluents. Preprints 2020, 2020100627 (doi: 10.20944/preprints202010.0627.v1).

Abstract

A winemaking waste was used as a precursor of activated carbon used in hazardous Cr(VI) removal from solutions. The preparation process consisted of a hydrothermal process, and a chemical activation, of the resulting product, with KOH. The adsorption results showed that the adsorption of Cr(VI) on the obtained activated carbon is strongly dependent on the stirring speed applied to the carbon/solution mixture, pH of the solution, and temperature. The equilibrium isotherm was well fitted to the Langmuir type-II equation, whereas the kinetic can be described by the pseudo-second-order kinetic model. Thermodynamic studies revealed that Cr(VI) adsorption was an exothermic and spontaneous process. Finally, desorption experiments showed that Cr(VI) was effectively desorbed using hydrazine sulfate solutions, and at the same time, the element was reduced to the less hazardous Cr(III) oxidation state.

Subject Areas

activated carbon; winemaking waste; wastewater; Cr(VI) removal; adsorption process; Cr(VI) reduction

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