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Colloids Interfaces 2018, 2(2), 19; https://doi.org/10.3390/colloids2020019

Use of Modified Colloids and Membranes to Remove Metal Ions from Contaminated Solutions

1
Institut UTINAM UMR CNRS 6213—Université Bourgogne Franche-Comté, 16 Route de Gray, 25030 Besançon CEDEX, France
2
Institut Charles Gerhardt UMR CNRS 5253—Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier CEDEX, France
*
Author to whom correspondence should be addressed.
Received: 12 March 2018 / Revised: 27 April 2018 / Accepted: 4 May 2018 / Published: 6 May 2018
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Abstract

An efficient process was developed allowing the removal of metal ions from polycontaminated aqueous solutions by combining modified colloids and membranes. Firstly, filtration experiments were performed using polyethersulfone membranes modified by a self-assembled multilayer film of polyelectrolytes. These polymer-modified membranes allowed the uptake of more than 90% of the metal ions initially present in the contaminated solutions (for solutions concentrated at 50 mg L−1). Secondly, adsorption experiments were carried out with colloidal silica encapsulated with carboxymethyl chitosan (SiO2-CMCS) or with mesoporous silica functionalized by grafting of 1,4,8,11-tetraazacyclotetradecane, i.e., cyclam (SiO2-cyclam). The adsorption capacity of these compounds was shown to be higher than numerous other literature-known adsorbents, reaching 68 and 61 mg g−1 towards Cu(II) for SiO2-CMCS and SiO2-cyclam, respectively. Finally, by coupling adsorption with ultrafiltration in the tangential mode, the removal of Cu(II), Ni(II) and Zn(II) ions was found to be improved, allowing to reach a removal efficiency of 99% towards Cu(II), Ni(II) and Zn(II) ions at a metal concentration of 50 mg L−1, and a promising removal efficiency around 70% at a very high metal concentration of 1200 mg L−1. The mechanisms involved in the capture of the metal ions by modified membranes and colloids are also discussed. View Full-Text
Keywords: hybrid silica; adsorbents; interfaces; metal removal; chemical functionalization; membrane filtration; water treatment hybrid silica; adsorbents; interfaces; metal removal; chemical functionalization; membrane filtration; water treatment
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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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Mokhter, M.A.; Magnenet, C.; Lakard, S.; Euvrard, M.; Aden, M.; Clément, S.; Mehdi, A.; Lakard, B. Use of Modified Colloids and Membranes to Remove Metal Ions from Contaminated Solutions. Colloids Interfaces 2018, 2, 19.

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