Szymura, Annika, Ilyas, Shaista, Horn, Mareike, Neundorf, Ines and Mathur, Sanjay (2020). Multivalent magnetic nanoaggregates with unified antibacterial activity and selective uptake of heavy metals and organic pollutants. J. Mol. Liq., 317. AMSTERDAM: ELSEVIER. ISSN 1873-3166

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Abstract

Covalently functionalized magnetite (Fe3O4) nanoaggregates carrying an imidazolium-derivative (1-hexadecyl-3-vinyl imidazolium bromide, HDVI) and L-cysteine (L-Cys) as surface ligands act as bimodal water-treatment particulate agents (HDVI@L-Cys@PAA@Fe3O4) with high antibacterial efficacy and specific surface adsorption properties. For covalent conjugation of HDVI the polyacrylic acid (PAA)-coated magnetite nanocrystals (PAA@Fe3O4) were functionalized with L-cysteine via carbodiimide coupling (L-Cys@PAA@Fe3O4) having terminal-SH groups that were used for thiol-ene click chemistry. The carefully performed series of water-remediation tests with magnetically separable HDVI@L-Cys@PAA@Fe3O4 nanoaggregates demonstrated their high efficiency in the concomitant removal transition metal ions and organic pollutant without losing the antibacterial effect. Time-dependent adsorption experiments showed high degree (>90%) of trapping and removal activity. Antibacterial action of the HDVI@L-Cys@PAA@Fe3O4 nanoaggregates originates from the amphiphilic structure of HDVI groups capable of penetrating the bacterial cell walls. The presence of surface-bound ligands and conversion efficiency of carbodiimide and click chemistry protocol was verified by FT-IR, elemental and thermogravimetric analysis. The phase, composition morphology and surface charge of nanoaggregates were examined by XRD, SEM/TEM and zeta potential studies, respectively. The experimental findings reported here represent a conceptual advancement in the state-of-the-art magnetic beads developed for water purification or remediation purposes. Our results evidently demonstrate that nanoaggregates are highly effective in unifying bactericidal activity against different microorganism with heavy metal and organic pollutant removal properties. (C) 2020 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Szymura, AnnikaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ilyas, ShaistaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horn, MareikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neundorf, InesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mathur, SanjayUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-313573
DOI: 10.1016/j.molliq.2020.114002
Journal or Publication Title: J. Mol. Liq.
Volume: 317
Date: 2020
Publisher: ELSEVIER
Place of Publication: AMSTERDAM
ISSN: 1873-3166
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
IRON-OXIDE NANOPARTICLES; IONIC LIQUIDS; POLYACRYLIC-ACID; METHYLENE-BLUE; L-CYSTEINE; REMOVAL; WATER; IMIDAZOLIUM; ADSORPTION; STABILITYMultiple languages
Chemistry, Physical; Physics, Atomic, Molecular & ChemicalMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/31357

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