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

Inventions

Michael E. Melcer¹  Adam J. Fisher¹  Ping Y. Furlan²  Alexander Y. Furlan²  John B. Warren²  David W. Shinn³ 

[1] Science Department, United States Merchant Marine Academy, Kings Point, NY 11024, USA;;Math &Neuroscience Department, Johns Hopkins University, Baltimore, MD 21218, USA;

关键词: silver nanoparticles;    magnetite nanoparticles;    activated carbon;    nanocomposites;    nanoadsorbents;    water disinfection;    water treatment;    magnetic;    antimicrobial;    environmental applications;   

DOI  :  10.3390/inventions2020010

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown