Chitosan-silica hybrid nanosorbents for oil removal from water
authors Soares, SF; Rodrigues, MI; Trindade, T; Daniel-da-Silva, AL
nationality International
journal COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
author keywords Bio-hybrids; Chitosan; Magnetic nanoparticles; Oil-water separation
keywords MAGNETITE NANOPARTICLES; COLLOIDAL SILICA; IR SPECTROSCOPY; SPILL CLEANUP; RICE HUSKS; CRUDE-OIL; SORBENT; PERFORMANCE; ADSORPTION; MERCURY
abstract Water pollution caused by oil spills is an environmental problem that raises concerns all over the world. Sorbent materials are of great importance for the removal of the remained oil after skimming operation. Nevertheless owing to reduced size, most sorbents are difficult to collect from water and therefore there is need to develop effective oil sorbents that could be easily separated from aquatic environments. Herein new magnetic nanosorbents composed of magnetite nanoparticles functionalized with chitosan hybrid siliceous shells were successfully prepared using a one-step sol-gel encapsulation method. As a proof of concept, these nanosorbents were tested in the magnetically assisted removal of non-polar organic solvents from water. The characterization of the materials using FTIR spectroscopy, solid-state Si-29 and C-13 NMR spectroscopy and elemental microanalysis confirmed the extensive modification of the particles' shells with chitosan molecules covalently linked to the siliceous domains. These hybrid particles could efficiently adsorb various non-polar organic solvents from water, a behavior that was ascribed to the presence of chitosan macromolecules grafted at the surface of the particles. This is a new type of sorbent with potential application in the removal of oil from water using magnetic separation technologies.
publisher ELSEVIER SCIENCE BV
issn 0927-7757
year published 2017
volume 532
beginning page 305
ending page 313
digital object identifier (doi) 10.1016/j.colsurfa.2017.04.076
web of science category Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000412065600043
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journal analysis (jcr 2017):
journal impact factor 2.829
5 year journal impact factor 2.852
category normalized journal impact factor percentile 52.721
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