Antimicrobial and Photocatalytic Degradation Activities of Chitosan-coated Magnetite Nanocomposite
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ORIGINAL PAPER
Antimicrobial and Photocatalytic Degradation Activities of Chitosancoated Magnetite Nanocomposite Ahmed M. El-Khawaga1 • Ayman A. Farrag2 • Mohamed A. Elsayed1 • Gharieb S. El-Sayyad1,3 Ahmed I. El-Batal3
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Received: 9 March 2020 Ó Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this work, iron oxide nanoparticles (Fe3O4 NPs) were modified by chitosan (CS). Fe3O4 NPs were synthesized by coprecipitation method and their antimicrobial potential and photo-catalytic degradation of Chloramine T (CT) were investigated. The free Fe3O4 NPs and chitosan-coated Fe3O4 NPs (CS-Fe3O4 NPs) were characterized by XRD, FTIR, SEM, and HRTEM. Fe3O4 NPs have spherical shape and their diameter varied from 18.0 nm to 25.0 nm with average particle size at 21.0 nm. Antimicrobial activity was tested towards some pathogenic bacteria and Candida cells as zone of inhibition (ZOI) and minimum inhibitory concentration (MIC). UV-assisted photocatalytic degradation of CT was investigated. Various parameters affecting the photocatalytic efficiency such as (pH on CT removal, CT initial concentration, and adsorbent dose) were studied. Antimicrobial results showed that CS-Fe3O4 NPs possesses a maximum potential against Escherichia coli, Bacillus subtilis and Candida albicans, by 18.0, 17.0, 14.2 mm ZOI, respectively. Results obtained from the photocatalytic activity indicated that CS-Fe3O4 NPs (2.0 gm/l) possessed a promising removal potential, achieving 86.0% removal of CT in the neutral solution (pH = 7.0). The synthesized CS-Fe3O4 NPs are effective for the removal of CT and potent disinfectant agent for pathogenic microbes with possible application in the wastewater treatment. Keywords Magnetite nanoparticles Chitosan Antimicrobial activity Photocatalytic potential Reaction mechanism
Introduction Nanotechnology has emerged as one of the most versatile fields in recent years [1, 2]. Nanoparticles (NPs) are drawing increasing attention due to their distinctive characteristics and minimal harmful effects [3, 4]. Magnetic NPs are becoming popular in bioengineering and
& Ahmed M. El-Khawaga [email protected] & Gharieb S. El-Sayyad [email protected] 1
Chemical Engineering Department, Military Technical College (MTC), Egyptian Armed Forces, Cairo, Egypt
2
Botany and Microbiology Department, Faculty of Science (Boys), Al-Azhar University, Cairo, Egypt
3
Drug Microbiology Lab, Drug Radiation Research Department, National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
biomedical applications [5, 6], due to their capability to act at the cellular and molecular level when exerted to in vitro and in vivo applications [7, 8]. Among NPs, iron oxide (Fe3O4) NPs are popular due to features such as superparamagnetic, biocompatibility, crystalline structure, nontoxicity, monodispersity, water soluble, and cost-effective in the synthetic method [9, 10]. The crystalline morphology
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