Preprint Article Version 1 This version is not peer-reviewed

Removal of Copper Ions in Wastewater by Adsorption onto a Green Adsorbent from Winemaking Wastes

Version 1 : Received: 16 September 2019 / Approved: 17 September 2019 / Online: 17 September 2019 (11:44:45 CEST)

How to cite: Alcaraz, L.; García-Díaz, I.; Alguacil, F.J.; López, F.A. Removal of Copper Ions in Wastewater by Adsorption onto a Green Adsorbent from Winemaking Wastes. Preprints 2019, 2019090185 (doi: 10.20944/preprints201909.0185.v1). Alcaraz, L.; García-Díaz, I.; Alguacil, F.J.; López, F.A. Removal of Copper Ions in Wastewater by Adsorption onto a Green Adsorbent from Winemaking Wastes. Preprints 2019, 2019090185 (doi: 10.20944/preprints201909.0185.v1).

Abstract

This article presents the copper ions adsorption process using an activated carbon from winemaking wastes. The pH, temperature, activated carbon amount and initial copper concentration were varied based on a full factorial 2k experimental design. Kinetic and thermodynamic studies were also carried out. The adsorption kinetics was found follow a pseudo-second-order model. The adsorption data fit better to the Langmuir isotherm. The ANOVA demonstrated that both pH of the solution and activated carbon dosage had the greatest influence on copper adsorption. The activation energy was -32 kJ·mol-1 suggesting that the copper adsorption is a physic-sorption process. The best fit to a linear correlation was the moving boundary equation that controls the kinetics for the adsorption copper ions onto the activated carbon. The X-ray photoelectron spectroscopy (XPS) results reveal the existence of different copper species (Cu2+, Cu+ and or Cu0) on the surface of the carbonaceous adsorbent after the adsorption, which could suggest a simultaneous reduction process.

Subject Areas

activated carbon; adsorption; copper; winemaking wastes

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