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Nanomaterials 2017, 7(3), 68;

Magnetic Hybrid Nanosorbents for the Uptake of Paraquat from Water

CICECO-Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
Author to whom correspondence should be addressed.
Academic Editor: Dror Avisar
Received: 12 February 2017 / Revised: 12 March 2017 / Accepted: 13 March 2017 / Published: 18 March 2017
(This article belongs to the Special Issue Nanomaterials for Water Treatment)
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Although paraquat has been banned in European countries, this herbicide is still used all over the world, thanks to its low-cost, high-efficiency, and fast action. Because paraquat is highly toxic to humans and animals, there is interest in mitigating the consequences of its use, namely by implementing removal procedures capable of curbing its environmental and health risks. This research describes new magnetic nanosorbents composed of magnetite cores functionalized with bio-hybrid siliceous shells, that can be used to uptake paraquat from water using magnetically-assisted procedures. The biopolymers κ-carrageenan and starch were introduced into the siliceous shells, resulting in two hybrid materials, Fe3O4@SiO2/SiCRG and Fe3O4@SiO2/SiStarch, respectively, that exhibit a distinct surface chemistry. The Fe3O4@SiO2/SiCRG biosorbents displayed a superior paraquat removal performance, with a good fitting to the Langmuir and Toth isotherm models. The maximum adsorption capacity of paraquat for Fe3O4@SiO2/SiCRG biosorbents was 257 mg·g−1, which places this sorbent among the best systems for the removal of this herbicide from water. The interesting performance of the κ-carrageenan hybrid, along with its magnetic properties and good regeneration capacity, presents a very efficient way for the remediation of water contaminated with paraquat. View Full-Text
Keywords: paraquat; adsorption; bio-hybrids; magnetic nanoparticles paraquat; adsorption; bio-hybrids; magnetic nanoparticles

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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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Fernandes, T.; Soares, S.F.; Trindade, T.; Daniel-da-Silva, A.L. Magnetic Hybrid Nanosorbents for the Uptake of Paraquat from Water. Nanomaterials 2017, 7, 68.

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