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Inventions 2017, 2(2), 10; doi:10.3390/inventions2020010

Magnetically Recoverable and Reusable Antimicrobial Nanocomposite Based on Activated Carbon, Magnetite Nanoparticles, and Silver Nanoparticles for Water Disinfection

1
Math & Science Department, United States Merchant Marine Academy, Kings Point, NY 11024, USA
2
Neuroscience Department, Johns Hopkins University, Baltimore, MD 21218, USA
3
Instrumentation Division, Brookhaven National Laboratory, Upton, NY 11973, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Mallikarjuna N. Nadagouda, Hyuksang Chang and Changseok Han
Received: 25 April 2017 / Revised: 28 May 2017 / Accepted: 30 May 2017 / Published: 6 June 2017
(This article belongs to the Special Issue Nanomaterials and Nanocomposites for Environmental Applications)
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Abstract

Recent advancements in nanotechnology have led to the development of innovative, low-cost and highly efficient water disinfection technologies that may replace or enhance the conventional methods. In this study, we introduce a novel procedure for preparing a bifunctional activated carbon nanocomposite in which nanoscale-sized magnetic magnetite and antimicrobial silver nanoparticles are incorporated (MACAg). The antimicrobial efficacy of the nanocomposite was tested against Escherichia coli (E. coli). MACAg (0.5 g, 0.04% Ag) was found to remove and kill 106–107 CFU (colony-forming units) in 30 min via a shaking test and the removing and killing rate of the nanocomposites increased with increasing silver content and decreased with increasing CFU. The inhibition zone tests revealed, among the relevant components, only Ag nanoparticles and Ag+ ions showed antimicrobial activities. The MACAg was easily recoverable from treated water due to its magnetic properties and was able to remove and kill 106 CFU after multiple-repeated use. The MACAg nanocomposite also demonstrated its feasibility and applicability for treating a surface water containing 105 CFU. Combining low cost due to easy synthesis, recoverability, and reusability with high antimicrobial efficiency, MACAg may provide a promising water disinfection technology that will find wide applications. View Full-Text
Keywords: silver nanoparticles; magnetite nanoparticles; activated carbon; nanocomposites; nanoadsorbents; water disinfection; water treatment; magnetic; antimicrobial; environmental applications silver nanoparticles; magnetite nanoparticles; activated carbon; nanocomposites; nanoadsorbents; water disinfection; water treatment; magnetic; antimicrobial; environmental applications
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Furlan, P.Y.; Fisher, A.J.; Furlan, A.Y.; Melcer, M.E.; Shinn, D.W.; Warren, J.B. Magnetically Recoverable and Reusable Antimicrobial Nanocomposite Based on Activated Carbon, Magnetite Nanoparticles, and Silver Nanoparticles for Water Disinfection. Inventions 2017, 2, 10.

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