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Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials

Massive amounts of industrial and agricultural water around the world are polluted by various types of contaminants that harm the environment and affect human health. Alginic acid is a very versatile green polymer used for heavy metal adsorption due to its availability, biocompatibility, low cost, a...

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Autores principales: Râpă, Maria, Ţurcanu, Anca Andreea, Matei, Ecaterina, Predescu, Andra Mihaela, Pantilimon, Mircea Cristian, Coman, George, Predescu, Cristian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8658144/
https://www.ncbi.nlm.nih.gov/pubmed/34885338
http://dx.doi.org/10.3390/ma14237187
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author Râpă, Maria
Ţurcanu, Anca Andreea
Matei, Ecaterina
Predescu, Andra Mihaela
Pantilimon, Mircea Cristian
Coman, George
Predescu, Cristian
author_facet Râpă, Maria
Ţurcanu, Anca Andreea
Matei, Ecaterina
Predescu, Andra Mihaela
Pantilimon, Mircea Cristian
Coman, George
Predescu, Cristian
author_sort Râpă, Maria
collection PubMed
description Massive amounts of industrial and agricultural water around the world are polluted by various types of contaminants that harm the environment and affect human health. Alginic acid is a very versatile green polymer used for heavy metal adsorption due to its availability, biocompatibility, low cost, and non-toxic characteristics. The aim of this paper was to prepare new low-cost hybrid composite beads using sodium alginate with treated montmorillonite and kaolin for the adsorption of copper (Cu) cations. Modified and unmodified clays were investigated by studying their morphology and elemental composition, functional groups, and mean particle size and particle size distribution. The characterization of alginate/clay hybrid composite beads was carried out by evaluating surface morphology (by scanning electron microscopy, SEM), crystallinity (by X-ray diffraction, XRD), and point of zero charge (pH(pzc))(Zeta Potential Analyzer). Batch adsorption experiments of alginate/clay hybrid composite beads investigated the effect of metal concentration in the range of 1–4 mg L(−1) on Cu(II) removal, adsorption kinetic for maximum 240 min, and Langmuir and Freundlich adsorption isotherms by using atomic absorption spectrometry. The pseudo-second-order kinetic model best fitted the adsorption for alginate/montmorillonite beads (R(2) = 0.994), while the diffusion process was predominant for montmorillonite/kaolin beads (R(2) = 0.985). The alginate/clay hybrid materials best fitted the Langmuir isotherm model.
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spelling pubmed-86581442021-12-10 Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials Râpă, Maria Ţurcanu, Anca Andreea Matei, Ecaterina Predescu, Andra Mihaela Pantilimon, Mircea Cristian Coman, George Predescu, Cristian Materials (Basel) Article Massive amounts of industrial and agricultural water around the world are polluted by various types of contaminants that harm the environment and affect human health. Alginic acid is a very versatile green polymer used for heavy metal adsorption due to its availability, biocompatibility, low cost, and non-toxic characteristics. The aim of this paper was to prepare new low-cost hybrid composite beads using sodium alginate with treated montmorillonite and kaolin for the adsorption of copper (Cu) cations. Modified and unmodified clays were investigated by studying their morphology and elemental composition, functional groups, and mean particle size and particle size distribution. The characterization of alginate/clay hybrid composite beads was carried out by evaluating surface morphology (by scanning electron microscopy, SEM), crystallinity (by X-ray diffraction, XRD), and point of zero charge (pH(pzc))(Zeta Potential Analyzer). Batch adsorption experiments of alginate/clay hybrid composite beads investigated the effect of metal concentration in the range of 1–4 mg L(−1) on Cu(II) removal, adsorption kinetic for maximum 240 min, and Langmuir and Freundlich adsorption isotherms by using atomic absorption spectrometry. The pseudo-second-order kinetic model best fitted the adsorption for alginate/montmorillonite beads (R(2) = 0.994), while the diffusion process was predominant for montmorillonite/kaolin beads (R(2) = 0.985). The alginate/clay hybrid materials best fitted the Langmuir isotherm model. MDPI 2021-11-25 /pmc/articles/PMC8658144/ /pubmed/34885338 http://dx.doi.org/10.3390/ma14237187 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
Râpă, Maria
Ţurcanu, Anca Andreea
Matei, Ecaterina
Predescu, Andra Mihaela
Pantilimon, Mircea Cristian
Coman, George
Predescu, Cristian
Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials
title Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials
title_full Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials
title_fullStr Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials
title_full_unstemmed Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials
title_short Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials
title_sort adsorption of copper (ii) from aqueous solutions with alginate/clay hybrid materials
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8658144/
https://www.ncbi.nlm.nih.gov/pubmed/34885338
http://dx.doi.org/10.3390/ma14237187
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