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Development and Characterization of Clay–Nanocomposites for Water Purification

In this work we propose a facile method of preparing cost-effective clay-metaloxide/metal (CuO/Ag and ZnO/Ag) composite pellets for an efficient water purification technique. Clay, with intrinsic antibacterial activity, served as a membrane support for different metaloxide/Ag nanoparticles (NPs) con...

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Autores principales: Asamoah, Richard Barnes, Yaya, Abu, Nbelayim, Paschal, Annan, Ebenezer, Onwona-Agyeman, Boateng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7504091/
https://www.ncbi.nlm.nih.gov/pubmed/32867394
http://dx.doi.org/10.3390/ma13173793
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author Asamoah, Richard Barnes
Yaya, Abu
Nbelayim, Paschal
Annan, Ebenezer
Onwona-Agyeman, Boateng
author_facet Asamoah, Richard Barnes
Yaya, Abu
Nbelayim, Paschal
Annan, Ebenezer
Onwona-Agyeman, Boateng
author_sort Asamoah, Richard Barnes
collection PubMed
description In this work we propose a facile method of preparing cost-effective clay-metaloxide/metal (CuO/Ag and ZnO/Ag) composite pellets for an efficient water purification technique. Clay, with intrinsic antibacterial activity, served as a membrane support for different metaloxide/Ag nanoparticles (NPs) concentrations (2.5, 5 and 10 wt.%), as the active fillers. The effect of time (24 and 48 h) on the bactericidal activity of these pellets was also monitored. The clay–nanocomposite pellets were characterized using: X-ray diffraction, X-ray fluorescence, scanning electron microscopy, transmission electron microscopy, ultraviolet–visible (UV–Vis) spectrophotometry and nitrogen desorption analysis. The antibacterial activity performance was tested using E. coli and S. aureus strains of ATCC25922 and ATCC25923, respectively, in two aqueous media (nutrient broth and nutrient-free) by the colony-forming unit method. The results showed that the clay-CuO/Ag composite with a bandgap (1.24 eV) exhibited overall best performance under all conditions and time factors of ~100% efficiency in nutrient-free medium for all concentrations and times and 20–40% efficiency in nutrient broth for 24 h. The clay-ZnO/Ag with a bandgap of 2.88 eV showed no bactericidal activity in both media, except for that with 10 wt.% ZnO/Ag which showed 100% efficiency in nutrient-free medium after 24 h. All the synthesized composites showed 100% bactericidal efficiency in nutrient free medium after 48 h. These results indicate that, the clay/metaloxide/Ag could serve as efficient water purification technique, with a potential for large-scale commercialization.
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spelling pubmed-75040912020-09-24 Development and Characterization of Clay–Nanocomposites for Water Purification Asamoah, Richard Barnes Yaya, Abu Nbelayim, Paschal Annan, Ebenezer Onwona-Agyeman, Boateng Materials (Basel) Article In this work we propose a facile method of preparing cost-effective clay-metaloxide/metal (CuO/Ag and ZnO/Ag) composite pellets for an efficient water purification technique. Clay, with intrinsic antibacterial activity, served as a membrane support for different metaloxide/Ag nanoparticles (NPs) concentrations (2.5, 5 and 10 wt.%), as the active fillers. The effect of time (24 and 48 h) on the bactericidal activity of these pellets was also monitored. The clay–nanocomposite pellets were characterized using: X-ray diffraction, X-ray fluorescence, scanning electron microscopy, transmission electron microscopy, ultraviolet–visible (UV–Vis) spectrophotometry and nitrogen desorption analysis. The antibacterial activity performance was tested using E. coli and S. aureus strains of ATCC25922 and ATCC25923, respectively, in two aqueous media (nutrient broth and nutrient-free) by the colony-forming unit method. The results showed that the clay-CuO/Ag composite with a bandgap (1.24 eV) exhibited overall best performance under all conditions and time factors of ~100% efficiency in nutrient-free medium for all concentrations and times and 20–40% efficiency in nutrient broth for 24 h. The clay-ZnO/Ag with a bandgap of 2.88 eV showed no bactericidal activity in both media, except for that with 10 wt.% ZnO/Ag which showed 100% efficiency in nutrient-free medium after 24 h. All the synthesized composites showed 100% bactericidal efficiency in nutrient free medium after 48 h. These results indicate that, the clay/metaloxide/Ag could serve as efficient water purification technique, with a potential for large-scale commercialization. MDPI 2020-08-27 /pmc/articles/PMC7504091/ /pubmed/32867394 http://dx.doi.org/10.3390/ma13173793 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Asamoah, Richard Barnes
Yaya, Abu
Nbelayim, Paschal
Annan, Ebenezer
Onwona-Agyeman, Boateng
Development and Characterization of Clay–Nanocomposites for Water Purification
title Development and Characterization of Clay–Nanocomposites for Water Purification
title_full Development and Characterization of Clay–Nanocomposites for Water Purification
title_fullStr Development and Characterization of Clay–Nanocomposites for Water Purification
title_full_unstemmed Development and Characterization of Clay–Nanocomposites for Water Purification
title_short Development and Characterization of Clay–Nanocomposites for Water Purification
title_sort development and characterization of clay–nanocomposites for water purification
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7504091/
https://www.ncbi.nlm.nih.gov/pubmed/32867394
http://dx.doi.org/10.3390/ma13173793
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