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Sustainability 2019, 11(5), 1406; https://doi.org/10.3390/su11051406

Recovery of Gold from Chloride Solution by TEMPO-Oxidized Cellulose Nanofiber Adsorbent

1
VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 Espoo, Finland
2
Laboratory of Hydrometallurgy and Corrosion, Department of Chemical and Metallurgical Engineering (CMET), Aalto University, P.O. Box 16200, FI-00076 Aalto, Finland
3
Department of Bioproducts and Biosystems (BIO2), Aalto University, P.O. Box 16300, FI-00076 Aalto, Finland
4
Department of Green Chemistry, Lappeenranta-Lahti University of Technology, FI-50130 Mikkeli, Finland
*
Authors to whom correspondence should be addressed.
Received: 7 February 2019 / Revised: 28 February 2019 / Accepted: 4 March 2019 / Published: 6 March 2019
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Abstract

The goal of this study was to assess the sustainability of a modified cellulose nanofiber material for the recovery of precious gold from chloride solution, with a special focus on gold recovery from acidic solutions generated by cupric and ferric chloride leaching processes. TEMPO-oxidized cellulose nanofiber in hydrogel (TOCN), dry (H-TOCN, F-TOCN) and sheet form (S-TOCN) was examined for gold adsorptivity from chloride solution. Additionally, this work describes the optimum conditions and parameters for gold recovery. The data obtained in this investigation are also modeled using kinetic (pseudo first-order and pseudo second-order), isotherm best fit (Freundlich, Langmuir and Langmuir-Freundlich), and thermodynamic (endothermic process) parameters. Results demonstrate that high levels of gold removal can be achieved with TEMPO-oxidized cellulose nanofibers (98% by H-TOCNF) and the interaction characteristics of H-TOCN with gold suggests that other precious metals could also be efficiently recovered. View Full-Text
Keywords: gold chlorides; TEMPO-oxidized cellulose nanofiber; adsorption; sustainability gold chlorides; TEMPO-oxidized cellulose nanofiber; adsorption; sustainability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Jafari, S.; Wilson, B.P.; Hakalahti, M.; Tammelin, T.; Kontturi, E.; Lundström, M.; Sillanpää, M. Recovery of Gold from Chloride Solution by TEMPO-Oxidized Cellulose Nanofiber Adsorbent. Sustainability 2019, 11, 1406.

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