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Type: Journal article
Title: Iron oxide nanowires from bacteria biofilm as an edfficient visible-light magnetic photocatalyst
Author: Wang, L.
Kumeria, T.
Santos, A.
Forward, P.
Lambert, M.
Losic, D.
Citation: ACS Applied Materials & Interfaces, 2016; 8(31):20110-20119
Publisher: American Chemical Society
Issue Date: 2016
ISSN: 1944-8244
Statement of
Luoshan Wang, Tushar Kumeria, Abel Santos, Peter Forward, Martin F. Lambert, and Dusan Losic
Abstract: Naturally produced iron oxide nanowires by Mariprofundus ferrooxydans bacteria as biofilm are evaluated for their structural, chemical, and photocatalytic performance under visible-light irradiation. The crystal phase structure of this unique natural material presents a 1-dimensional (1D) nanowire-like geometry, which is transformed from amorphous to crystalline (hematite) by thermal annealing at high temperature without changing their morphology. This study systematically assesses the effect of different annealing temperatures on the photocatalytic activity of iron oxide nanowires produced by Mariprofundus ferrooxydans bacteria. The nanowires processed at 800 °C were the most optimal for photocatalytic applications degrading a model dye (rhodamine B) in less than an hour. These nanowires displayed excellent reusability with no significant loss of activity even after 6 cycles. Kinetic studies by using hydrogen peroxide (radical generator) and isopropyl alcohol (radical scavenger) suggest that OH• is the dominant photooxidant. These nanowires are naturally produced, inexpensive, highly active, stable, and magnetic and have the potential to be used for broad applications including environmental remediation, water disinfection, and industrial catalysis.
Keywords: iron oxide nanowires; bacteria biofilm; rhodamine B; visible-light photocatalysis; natural nanostructure
Description: Published: July 15, 2016
Rights: © 2016 American Chemical Society
RMID: 0030052087
DOI: 10.1021/acsami.6b06486
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