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Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites

A sample of rhyolitic obsidian (OS) was used as raw material for zeolite synthesis by long (4 days) and fast (2 h)-aging hydrothermal processes. Zeolite synthesis was also performed by a fast (2 h) sonication method. The products were analysed by X-ray diffraction (XRD) and scanning electron microsc...

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Autores principales: Belviso, Claudia, Peddis, Davide, Varvaro, Gaspare, Abdolrahimi, Maryam, Reverberi, Andrea Pietro, Cavalcante, Francesco
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7603046/
https://www.ncbi.nlm.nih.gov/pubmed/33081399
http://dx.doi.org/10.3390/ma13204633
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author Belviso, Claudia
Peddis, Davide
Varvaro, Gaspare
Abdolrahimi, Maryam
Reverberi, Andrea Pietro
Cavalcante, Francesco
author_facet Belviso, Claudia
Peddis, Davide
Varvaro, Gaspare
Abdolrahimi, Maryam
Reverberi, Andrea Pietro
Cavalcante, Francesco
author_sort Belviso, Claudia
collection PubMed
description A sample of rhyolitic obsidian (OS) was used as raw material for zeolite synthesis by long (4 days) and fast (2 h)-aging hydrothermal processes. Zeolite synthesis was also performed by a fast (2 h) sonication method. The products were analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) both immediately after and 3 years after their formation in order to determine the stability of synthetic materials according to the method used. The results confirm zeolitization of obsidian both by long-aging conventional hydrothermal heating and fast hydrothermal process. However, the data highlight the efficiency of direct ultrasound energy in achieving more stable zeolite crystals over time. These results carried out using a natural source, follow those already obtained using wastes and pure sources as raw materials thus providing a definitive validation of the different mechanisms controlling zeolite formation according to the process used. Moreover, the results confirm the effectiveness of ultrasonic energy in the formation of zeolites that are more stable over time. Due to the chemical composition of the obsidian precursor, all synthetic zeolites show good magnetic properties (i.e., saturation magnetization), in view to potential magnetic separation.
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spelling pubmed-76030462020-11-01 Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites Belviso, Claudia Peddis, Davide Varvaro, Gaspare Abdolrahimi, Maryam Reverberi, Andrea Pietro Cavalcante, Francesco Materials (Basel) Article A sample of rhyolitic obsidian (OS) was used as raw material for zeolite synthesis by long (4 days) and fast (2 h)-aging hydrothermal processes. Zeolite synthesis was also performed by a fast (2 h) sonication method. The products were analysed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) both immediately after and 3 years after their formation in order to determine the stability of synthetic materials according to the method used. The results confirm zeolitization of obsidian both by long-aging conventional hydrothermal heating and fast hydrothermal process. However, the data highlight the efficiency of direct ultrasound energy in achieving more stable zeolite crystals over time. These results carried out using a natural source, follow those already obtained using wastes and pure sources as raw materials thus providing a definitive validation of the different mechanisms controlling zeolite formation according to the process used. Moreover, the results confirm the effectiveness of ultrasonic energy in the formation of zeolites that are more stable over time. Due to the chemical composition of the obsidian precursor, all synthetic zeolites show good magnetic properties (i.e., saturation magnetization), in view to potential magnetic separation. MDPI 2020-10-16 /pmc/articles/PMC7603046/ /pubmed/33081399 http://dx.doi.org/10.3390/ma13204633 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
Belviso, Claudia
Peddis, Davide
Varvaro, Gaspare
Abdolrahimi, Maryam
Reverberi, Andrea Pietro
Cavalcante, Francesco
Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites
title Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites
title_full Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites
title_fullStr Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites
title_full_unstemmed Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites
title_short Obsidian as a Raw Material for Eco-Friendly Synthesis of Magnetic Zeolites
title_sort obsidian as a raw material for eco-friendly synthesis of magnetic zeolites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7603046/
https://www.ncbi.nlm.nih.gov/pubmed/33081399
http://dx.doi.org/10.3390/ma13204633
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