Magnetic Hybrid Nanosorbents for the Uptake of Paraquat from Water
authors Fernandes, T; Soares, SF; Trindade, T; Daniel-Da-Silva, AL
nationality International
journal NANOMATERIALS
author keywords paraquat; adsorption; bio-hybrids; magnetic nanoparticles
keywords QUANTITATIVE-ANALYSIS; ADSORPTION BEHAVIOR; PARKINSONS-DISEASE; HERBICIDE PARAQUAT; KAPPA-CARRAGEENAN; AQUEOUS-SOLUTIONS; IRON-OXIDES; FT-RAMAN; REMOVAL; SORPTION
abstract 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 kappa-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 kappa-carrageenan hybrid, along with its magnetic properties and good regeneration capacity, presents a very efficient way for the remediation of water contaminated with paraquat.
publisher MDPI AG
issn 2079-4991
year published 2017
volume 7
issue 3
digital object identifier (doi) 10.3390/nano7030068
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
subject category Science & Technology - Other Topics; Materials Science
unique article identifier WOS:000400761900019
  ciceco authors
  impact metrics
times cited (wos core): 0
journal impact factor (jcr 2016): 3.553
5 year journal impact factor (jcr 2016): 4.100
category normalized journal impact factor percentile (jcr 2016): 70.867
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