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Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles
Organic–inorganic magnetic hybrid materials (MHMs) combine a nonmagnetic and a magnetic component by means of electrostatic interactions or covalent bonds, and notable features can be achieved. Herein, we describe an application of a self-assembled material based on ferrite associated with β-cyclode...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3511024/ https://www.ncbi.nlm.nih.gov/pubmed/23209524 http://dx.doi.org/10.3762/bjoc.8.215 |
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author | Denadai, Ângelo M L De Sousa, Frederico B Passos, Joel J Guatimosim, Fernando C Barbosa, Kirla D Burgos, Ana E de Oliveira, Fernando Castro da Silva, Jeann C Neves, Bernardo R A Mohallem, Nelcy D S Sinisterra, Rubén D |
author_facet | Denadai, Ângelo M L De Sousa, Frederico B Passos, Joel J Guatimosim, Fernando C Barbosa, Kirla D Burgos, Ana E de Oliveira, Fernando Castro da Silva, Jeann C Neves, Bernardo R A Mohallem, Nelcy D S Sinisterra, Rubén D |
author_sort | Denadai, Ângelo M L |
collection | PubMed |
description | Organic–inorganic magnetic hybrid materials (MHMs) combine a nonmagnetic and a magnetic component by means of electrostatic interactions or covalent bonds, and notable features can be achieved. Herein, we describe an application of a self-assembled material based on ferrite associated with β-cyclodextrin (Fe-Ni/Zn/βCD) at the nanoscale level. This MHM and pure ferrite (Fe-Ni/Zn) were used as an adsorbent system for Cr(3+) and Cr(2)O(7)(2−) ions in aqueous solutions. Prior to the adsorption studies, both ferrites were characterized in order to determine the particle size distribution, morphology and available binding sites on the surface of the materials. Microscopy analysis demonstrated that both ferrites present two different size domains, at the micro- and nanoscale level, with the latter being able to self-assemble into larger particles. Fe-Ni/Zn/βCD presented smaller particles and a more homogeneous particle size distribution. Higher porosity for this MHM compared to Fe-Ni/Zn was observed by Brunauer–Emmett–Teller isotherms and positron-annihilation-lifetime spectroscopy. Based on the pKa values, potentiometric titrations demonstrated the presence of βCD in the inorganic matrix, indicating that the lamellar structures verified by transmission electronic microscopy can be associated with βCD assembled structures. Colloidal stability was inferred as a function of time at different pH values, indicating the sedimentation rate as a function of pH. Zeta potential measurements identified an amphoteric behavior for the Fe-Ni/Zn/βCD, suggesting its better capability to remove ions (cations and anions) from aqueous solutions compared to that of Fe-Ni/Zn. |
format | Online Article Text |
id | pubmed-3511024 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
spelling | pubmed-35110242012-12-03 Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles Denadai, Ângelo M L De Sousa, Frederico B Passos, Joel J Guatimosim, Fernando C Barbosa, Kirla D Burgos, Ana E de Oliveira, Fernando Castro da Silva, Jeann C Neves, Bernardo R A Mohallem, Nelcy D S Sinisterra, Rubén D Beilstein J Org Chem Full Research Paper Organic–inorganic magnetic hybrid materials (MHMs) combine a nonmagnetic and a magnetic component by means of electrostatic interactions or covalent bonds, and notable features can be achieved. Herein, we describe an application of a self-assembled material based on ferrite associated with β-cyclodextrin (Fe-Ni/Zn/βCD) at the nanoscale level. This MHM and pure ferrite (Fe-Ni/Zn) were used as an adsorbent system for Cr(3+) and Cr(2)O(7)(2−) ions in aqueous solutions. Prior to the adsorption studies, both ferrites were characterized in order to determine the particle size distribution, morphology and available binding sites on the surface of the materials. Microscopy analysis demonstrated that both ferrites present two different size domains, at the micro- and nanoscale level, with the latter being able to self-assemble into larger particles. Fe-Ni/Zn/βCD presented smaller particles and a more homogeneous particle size distribution. Higher porosity for this MHM compared to Fe-Ni/Zn was observed by Brunauer–Emmett–Teller isotherms and positron-annihilation-lifetime spectroscopy. Based on the pKa values, potentiometric titrations demonstrated the presence of βCD in the inorganic matrix, indicating that the lamellar structures verified by transmission electronic microscopy can be associated with βCD assembled structures. Colloidal stability was inferred as a function of time at different pH values, indicating the sedimentation rate as a function of pH. Zeta potential measurements identified an amphoteric behavior for the Fe-Ni/Zn/βCD, suggesting its better capability to remove ions (cations and anions) from aqueous solutions compared to that of Fe-Ni/Zn. Beilstein-Institut 2012-11-01 /pmc/articles/PMC3511024/ /pubmed/23209524 http://dx.doi.org/10.3762/bjoc.8.215 Text en Copyright © 2012, Denadai et al. https://creativecommons.org/licenses/by/2.0https://www.beilstein-journals.org/bjoc/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Organic Chemistry terms and conditions: (https://www.beilstein-journals.org/bjoc/terms) |
spellingShingle | Full Research Paper Denadai, Ângelo M L De Sousa, Frederico B Passos, Joel J Guatimosim, Fernando C Barbosa, Kirla D Burgos, Ana E de Oliveira, Fernando Castro da Silva, Jeann C Neves, Bernardo R A Mohallem, Nelcy D S Sinisterra, Rubén D Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles |
title | Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles |
title_full | Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles |
title_fullStr | Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles |
title_full_unstemmed | Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles |
title_short | Self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles |
title_sort | self-assembled organic–inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles |
topic | Full Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3511024/ https://www.ncbi.nlm.nih.gov/pubmed/23209524 http://dx.doi.org/10.3762/bjoc.8.215 |
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