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Open AccessArticle

On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multiwalled Carbon Nanotubes

National Center for Metallurgical Research (CENIM), Spanish National Research Council (CSIC), Avda. Gregorio del Amo, 8, 28040 Madrid, Spain
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Appl. Sci. 2020, 10(1), 36; https://doi.org/10.3390/app10010036
Received: 15 November 2019 / Revised: 11 December 2019 / Accepted: 13 December 2019 / Published: 19 December 2019
(This article belongs to the Special Issue Recent Advances in Water Analysis and Wastewater Treatment)
The present investigation deals with the adsorption of chromium(III) from alkaline media, as representative of highly-caustic component solutions of nuclear tank wastes, using multiwalled carbon nanotubes. The adsorption of Cr(III) has been studied under various experimental conditions, i.e., 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 with the pseudo-second order kinetic model within an exothermic setting. Equilibrium data fit to the Langmuir type-2 equilibrium isotherm in a spontaneous process. Chromium(III) can be eluted from metal-loaded nanotubes using acidic solutions, from which fine chromium(III) oxide pigment can ultimately be yielded. View Full-Text
Keywords: carbon nanotubes; chromium(III); adsorption; kinetics; alkaline medium carbon nanotubes; chromium(III); adsorption; kinetics; alkaline medium
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MDPI and ACS Style

Alguacil, F.J.; López, F.A. On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multiwalled Carbon Nanotubes. Appl. Sci. 2020, 10, 36. https://doi.org/10.3390/app10010036

AMA Style

Alguacil FJ, López FA. On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multiwalled Carbon Nanotubes. Applied Sciences. 2020; 10(1):36. https://doi.org/10.3390/app10010036

Chicago/Turabian Style

Alguacil, Francisco J.; López, Félix A. 2020. "On the Active Adsorption of Chromium(III) from Alkaline Solutions Using Multiwalled Carbon Nanotubes" Appl. Sci. 10, no. 1: 36. https://doi.org/10.3390/app10010036

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