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Polyamine-Based Organo-Clays for Polluted Water Treatment: Effect of Polyamine Structure and Content

Politecnico di Milano, Dipartimento di Chimica, Materiali e Ingegneria Chimica “Giulio Natta,” Piazza Leonardo Da Vinci 32, 20133 Milano, Italy
Università di Genova, Dipartimento di Ingegneria Civile, Chimica e Ambientale, Via all’Opera Pia 15, 16145 Genova, Italy
Università degli Studi di Pavia, Dipartimento di Chimica, Via Taramelli 12, 27100 Pavia, Italy
Authors to whom correspondence should be addressed.
Polymers 2019, 11(5), 897;
Received: 27 March 2019 / Revised: 30 April 2019 / Accepted: 13 May 2019 / Published: 16 May 2019
(This article belongs to the Special Issue Polymer Clay Nano-composites)
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Hybrid materials based on clays and polyamines are supposed to be efficient heavy metals sorbents due to the well-known adsorption behaviour of the clay matrix and to the coordination properties of un-protonated amino groups. For this purpose, a montmorillonite clay was modified with three different aliphatic polyamines: L6 and L10 have a linear structure with six and ten amino groups, respectively, while B14 is a branched polyamine with fourteen amino groups. Initial amine concentration was the main parameter investigated and data were fitted with Langmuir and Freundlich models. Interaction mechanisms between clay and amines were deeply investigated by different experimental techniques such as X-ray powder diffraction (XRD), thermal analysis measurements (DTG), Fourier Transform Infrared Spectroscopy (FT-IR) and diffuse reflectance (NIR) spectroscopy. Experimental results showed that the amount of amines efficiently immobilized in the solid phase can be increased by increasing the initial concentration of polyamines in the clay modification process. These data were best fitted by Freundlich model, indicating a presence of surface sites of different nature. In the resulting hybrid materials, neither the accessibility of the NH/NH2 groups of the amines, nor the accessibility of the structural OH of the clay was hindered. Several preliminary tests in La ions’ uptake and release from aqueous solution were also carried out. In the conditions used for this study, total metal ion removal was achieved at sufficiently low linear amine loadings (i.e., 0.45 mmol/gclay for the small L6 amine), suggesting that these hybrid materials are promising for the proposed application in environmental remediation.
Keywords: organo-clays; polyamines; clay-amine interaction mechanisms; structure effects; la uptake and release organo-clays; polyamines; clay-amine interaction mechanisms; structure effects; la uptake and release

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Cristiani, C.; Iannicelli-Zubiani, E.M.; Dotelli, G.; Finocchio, E.; Gallo Stampino, P.; Licchelli, M. Polyamine-Based Organo-Clays for Polluted Water Treatment: Effect of Polyamine Structure and Content. Polymers 2019, 11, 897.

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