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Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption
Fe(3)O(4)@SiO(2) core-shell nanoparticles (NPs) were synthesized with the co-precipitation method and functionalized with NH(2) amino-groups. The nanoparticles were characterized by X-ray, FT-IR spectroscopy, transmission electron microscopy, selected area electron diffraction, and vibrating sample...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8470247/ https://www.ncbi.nlm.nih.gov/pubmed/34578686 http://dx.doi.org/10.3390/nano11092371 |
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author | Lin, Chun-Rong Ivanova, Oxana S. Petrov, Dmitry A. Sokolov, Alexey E. Chen, Ying-Zhen Gerasimova, Marina A. Zharkov, Sergey M. Tseng, Yaw-Teng Shestakov, Nicolay P. Edelman, Irina S. |
author_facet | Lin, Chun-Rong Ivanova, Oxana S. Petrov, Dmitry A. Sokolov, Alexey E. Chen, Ying-Zhen Gerasimova, Marina A. Zharkov, Sergey M. Tseng, Yaw-Teng Shestakov, Nicolay P. Edelman, Irina S. |
author_sort | Lin, Chun-Rong |
collection | PubMed |
description | Fe(3)O(4)@SiO(2) core-shell nanoparticles (NPs) were synthesized with the co-precipitation method and functionalized with NH(2) amino-groups. The nanoparticles were characterized by X-ray, FT-IR spectroscopy, transmission electron microscopy, selected area electron diffraction, and vibrating sample magnetometry. The magnetic core of all the nanoparticles was shown to be nanocrystalline with the crystal parameters corresponding only to the Fe(3)O(4) phase covered with a homogeneous amorphous silica (SiO(2)) shell of about 6 nm in thickness. The FT-IR spectra confirmed the appearance of chemical bonds at amino functionalization. The magnetic measurements revealed unusually high saturation magnetization of the initial Fe(3)O(4) nanoparticles, which was presumably associated with the deviations in the Fe ion distribution between the tetrahedral and octahedral positions in the nanocrystals as compared to the bulk stoichiometric magnetite. The fluorescent spectrum of eosin Y-doped NPs dispersed in water solution was obtained and a red shift and line broadening (in comparison with the dye molecules being free in water) were revealed and explained. Most attention was paid to the adsorption properties of the nanoparticles with respect to three dyes: methylene blue, Congo red, and eosin Y. The kinetic data showed that the adsorption processes were associated with the pseudo-second order mechanism for all three dyes. The equilibrium data were more compatible with the Langmuir isotherm and the maximum adsorption capacity was reached for Congo red. |
format | Online Article Text |
id | pubmed-8470247 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-84702472021-09-27 Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption Lin, Chun-Rong Ivanova, Oxana S. Petrov, Dmitry A. Sokolov, Alexey E. Chen, Ying-Zhen Gerasimova, Marina A. Zharkov, Sergey M. Tseng, Yaw-Teng Shestakov, Nicolay P. Edelman, Irina S. Nanomaterials (Basel) Article Fe(3)O(4)@SiO(2) core-shell nanoparticles (NPs) were synthesized with the co-precipitation method and functionalized with NH(2) amino-groups. The nanoparticles were characterized by X-ray, FT-IR spectroscopy, transmission electron microscopy, selected area electron diffraction, and vibrating sample magnetometry. The magnetic core of all the nanoparticles was shown to be nanocrystalline with the crystal parameters corresponding only to the Fe(3)O(4) phase covered with a homogeneous amorphous silica (SiO(2)) shell of about 6 nm in thickness. The FT-IR spectra confirmed the appearance of chemical bonds at amino functionalization. The magnetic measurements revealed unusually high saturation magnetization of the initial Fe(3)O(4) nanoparticles, which was presumably associated with the deviations in the Fe ion distribution between the tetrahedral and octahedral positions in the nanocrystals as compared to the bulk stoichiometric magnetite. The fluorescent spectrum of eosin Y-doped NPs dispersed in water solution was obtained and a red shift and line broadening (in comparison with the dye molecules being free in water) were revealed and explained. Most attention was paid to the adsorption properties of the nanoparticles with respect to three dyes: methylene blue, Congo red, and eosin Y. The kinetic data showed that the adsorption processes were associated with the pseudo-second order mechanism for all three dyes. The equilibrium data were more compatible with the Langmuir isotherm and the maximum adsorption capacity was reached for Congo red. MDPI 2021-09-12 /pmc/articles/PMC8470247/ /pubmed/34578686 http://dx.doi.org/10.3390/nano11092371 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Lin, Chun-Rong Ivanova, Oxana S. Petrov, Dmitry A. Sokolov, Alexey E. Chen, Ying-Zhen Gerasimova, Marina A. Zharkov, Sergey M. Tseng, Yaw-Teng Shestakov, Nicolay P. Edelman, Irina S. Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption |
title | Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption |
title_full | Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption |
title_fullStr | Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption |
title_full_unstemmed | Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption |
title_short | Amino-Functionalized Fe(3)O(4)@SiO(2) Core-Shell Magnetic Nanoparticles for Dye Adsorption |
title_sort | amino-functionalized fe(3)o(4)@sio(2) core-shell magnetic nanoparticles for dye adsorption |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8470247/ https://www.ncbi.nlm.nih.gov/pubmed/34578686 http://dx.doi.org/10.3390/nano11092371 |
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