Preprint Article Version 1 This version is not peer-reviewed

On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multi-Walled Carbon Nanotubes

Version 1 : Received: 15 November 2019 / Approved: 17 November 2019 / Online: 17 November 2019 (13:17:04 CET)

How to cite: Alguacil, F.J.; López, F.A. On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multi-Walled Carbon Nanotubes. Preprints 2019, 2019110203 (doi: 10.20944/preprints201911.0203.v1). Alguacil, F.J.; López, F.A. On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multi-Walled Carbon Nanotubes. Preprints 2019, 2019110203 (doi: 10.20944/preprints201911.0203.v1).

Abstract

The present investigation deals with the adsorption of chromium(III) from alkaline media using multi-walled carbon nanotubes. The adsorption of Cr(III) has been studied under various experimental conditions: stirring speed of the aqueous solution, initial metal and adsorbent concentrations, NaOH concentration in the aqueous solution, and temperature. The rate law indicated that chromium adsorption is well represented by the particle diffusion model, whereas the adsorption process fits to the pseudo-second order kinetic model within an exothermic character. Equilibrium data fit to the Langmuir type-2 equilibrium isotherm in an spontaneous process. Chromium(III) can be eluted from metal-loaded nanotubes using acidic solutions, from which fine chromium(III) oxide pigment can be ultimately yielded.

Subject Areas

carbon nanotubes; chromium; wastewaters; adsorption

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