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Polymers 2018, 10(6), 626; https://doi.org/10.3390/polym10060626

Selective and Efficient Arsenic Recovery from Water through Quaternary Amino-Functionalized Silica

1
Vicerrectoría de Investigación y Postgrado, Universidad Católica del Maule, 3460000 Talca, Chile
2
Instituto de Química de Recursos Naturales, Universidad de Talca, 3460000 Talca, Chile
3
Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería en Construcción, Universidad Autónoma de Chile, 3460000 Talca, Chile
4
Laboratory of Asymmetric Synthesis, Instituto de Química de Recursos Naturales, Universidad de Talca, 3460000 Talca, Chile
*
Author to whom correspondence should be addressed.
Received: 9 May 2018 / Revised: 25 May 2018 / Accepted: 30 May 2018 / Published: 7 June 2018
(This article belongs to the Special Issue Polymers: Design, Function and Application)
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Abstract

The free-radical graft polymerization of acryloxyethyl-trimethylammonium chloride onto commercial silica particles was studied experimentally for extraction of arsenic ions from water. Two steps were used to graft acryloxyethyl-trimethylammonium chloride (Q) onto the surface of nanosilica: anchoring vinyltrimethoxysilane (VTMSO) onto the surface of silica to modify it with double bonds and then grafting Q onto the surface of silica with potassium persulfate as an initiator. The products were characterized by Fourier-transform infrared (FT-IR), the thermogravimetric analysis (TGA), scanning electron microscopy (SEM), 13C, 29Si nuclear magnetic resonance (NMR), and X-ray powder diffraction (XRD). The results showed that it is easy to graft Q onto the surface of silica under radical polimerization. The morphology analysis of silica and modified silica indicated that the silica decreased the size scale after modification. Q/VTMSO-SiO2 was tested for its ability to remove arsenic from drinking water. The results show that the new silica hybrid particles efficiently remove all arsenate ions. In addition, Q/VTMSO-SiO2 showed better sorption capacities for other metal ions (such as copper, zinc, chromium, uranium, vanadium, and lead) than a commercial water filter. View Full-Text
Keywords: quaternary ammonium; arsenic; vinyltrimethoxysilane; graft polymerization; silica quaternary ammonium; arsenic; vinyltrimethoxysilane; graft polymerization; silica
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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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Valdés, O.; Marican, A.; Mirabal-Gallardo, Y.; Santos, L.S. Selective and Efficient Arsenic Recovery from Water through Quaternary Amino-Functionalized Silica. Polymers 2018, 10, 626.

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