Inactivation of Bacteria by Electric Current in the Presence of Carbon Nanotubes Embedded Within a Polymeric Membrane
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Author(s)
Long, Feng
Zhu, Anna
Su, Erzheng
Liu, Harris K.
Klibanov, Alexander M
Date Issued
October 2014
Journal
Applied Biochemistry and Biotechnology
Publisher
Springer US
Citation
Zhu, Anna, Harris K. Liu, Feng Long, Erzheng Su, and Alexander M. Klibanov. “Inactivation of Bacteria by Electric Current in the Presence of Carbon Nanotubes Embedded Within a Polymeric Membrane.” Applied Biochemistry and Biotechnology 175, no. 2 (October 24, 2014): 666–676.
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Author's final manuscript
Abstract
Uniform conductive composite membranes were prepared using a phase inversion method by blending carboxyl-functionalized multi-walled carbon nanotubes (CNTs) with a polysulfone polymer. At 6 % of the embedded CNTs, the membrane pore size measured by transmission electron microscopy (TEM) was approximately 50 nm. Electric current in the presence of the composite membranes markedly inactivated the model pathogenic bacteria Escherichia coli and Staphylococcus aureus, with the extent of bacterial inactivation rising when the current was increased. Over 99.999 % inactivation of both bacteria was observed in deionized water after 40 min at 5 mA direct current (DC); importantly, no appreciable inactivation occurred in the absence of either the electric field or the CNTs within the membranes under otherwise the same conditions. A much lower, although still pronounced, inactivation was seen with alternating current (AC) in a 25 mM NaCl aqueous solution.
MIT Department
Massachusetts Institute of Technology. Department of Biological Engineering
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1007/s12010-014-1318-z
