Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 40, Pages 14219-14226Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201600544
Keywords
chromium; maghemite nanoparticles; magnetic removal; salmonella typhimurium ta100; waste prevention
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Funding
- Italian Institutional Ministry, PRIN grant [2010MKHT9B]
- Progetto di Ateneo grant from the University of Padua, Italy [CPDA131233]
- European Center for the Sustainable Impact of Nanotechnology (ECSIN - Veneto Nanotech)
- Operational Program Research and Development for Innovations-European Regional Development Fund [CZ.1.05/2.1.00/03.0058]
- European Regional Development Fund-European Social Fund of the Ministry of Education, Youth and Sports of the Czech Republic [CZ.1.07/2.3.00/20.0155]
- Grant Agency of the Academy of Sciences of the Czech Republic [KAN115600801, KAN200380801]
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The present study is aimed at the exploration of achievable improvements for Cr-VI ex situ and in situ water remediation by using novel naked colloidal maghemite (gamma-Fe2O3) nanoparticles (surface active maghemite nanoparticles, SAMNs). The reliability of SAMNs for Cr-VI binding and removal was demonstrated, and SAMN@Cr-VI complex was characterized, as well as the covalent nature of the absorption was unequivocally proved. SAMNs were structurally and magnetically well conserved after Cr-VI binding. Thus, in consideration of their affinity for Cr-VI, SAMNs were exploited in a biological model system, mimicking a real in situ application. The assay evidenced a progressive reduction of revertant colonies of Salmonella typhimurium TA100 strain, as maghemite nanoparticles concentration increased, till the complete suppression of Cr-VI mutagen effect. Finally, an automatic modular pilot system for continuous magnetic removal and recovery of Cr-VI from water is proposed. SAMNs, thanks to their colloidal, binding, and catalytic properties, represent a promising tool as a reliable nanomaterial for water remediation by Cr-VI.
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