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Magnetically ultraresponsive nanoscavengers for next-generation water purification systems.

TitleMagnetically ultraresponsive nanoscavengers for next-generation water purification systems.
Publication TypeJournal Article
Year of Publication2013
AuthorsZhang M, Xie X, Tang M, Criddle CS, Cui Y, Wang SX
JournalNat Commun
Volume4
Pagination1866
Date Published2013
ISSN2041-1723
KeywordsAnti-Bacterial Agents, Disinfection, Escherichia coli, Magnetic Phenomena, Magnets, Nanoparticles, Silver, Solutions, Water Pollutants, Chemical, Water Purification
Abstract

The development of sustainable, robust and energy efficient water purification technology is still challenging. Although use of nanoparticles is promising, methods are needed for their efficient recovery post treatment. Here we address this issue by fabrication of magnetically ultraresponsive 'nanoscavengers', nanoparticles containing synthetic antiferromagnetic core layers and functional capping layers. When dispersed in water, the nanoscavengers efficiently interact with contaminants to remove them from the water. They are then quickly collected (<5 min) with a permanent magnet, owing to their magnetically ultraresponsive core layers. Specifically, we demonstrate fabrication and deployment of Ag-capped nanoscavengers for disinfection followed by application of an external magnetic field for separation. We also develop and validate a collision-based model for pathogen inactivation, and propose a cyclical water purification scheme in which nanoscavengers are recovered and recycled for contaminant removal.

DOI10.1038/ncomms2892
Alternate JournalNat Commun
PubMed ID23673651
PubMed Central IDPMC4123635
Grant ListR33 CA138330 / CA / NCI NIH HHS / United States
R33CA138330 / CA / NCI NIH HHS / United States
U54 CA151459 / CA / NCI NIH HHS / United States
U54CA151459 / CA / NCI NIH HHS / United States