Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation

The use of Mg-montmorillonite in the production of organoclay without sodium activation was investigated. For this purpose, organophilization experiments were carried out by varying the concentration of two surfactants: hexadecyltrimethylammonium (HDTMA+) and dodecyltrimethy-lammonium (DTMA+) ions....

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Principais autores:	Ito, Edson Noryuki, Cavalcante, Manoella Silva, Paz, Simone Patrícia Aranha, Angélica, Rômulo Simões, Neves, Roberto Freitas
Formato:	article
Idioma:	French
Publicado em:	Mineralogical Society
Assuntos:	Mg-montmorillonite Organoclay Smectite Bentonite Sodium activation
Endereço do item:	https://repositorio.ufrn.br/handle/123456789/37977
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spelling	ri-123456789-379772021-09-23T13:37:01Z Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation Ito, Edson Noryuki Cavalcante, Manoella Silva Paz, Simone Patrícia Aranha Angélica, Rômulo Simões Neves, Roberto Freitas Mg-montmorillonite Organoclay Smectite Bentonite Sodium activation The use of Mg-montmorillonite in the production of organoclay without sodium activation was investigated. For this purpose, organophilization experiments were carried out by varying the concentration of two surfactants: hexadecyltrimethylammonium (HDTMA+) and dodecyltrimethy-lammonium (DTMA+) ions. These surfactants were used at concentrations 0.7, 1.0 and 1.5 times that of the cation exchange capacity (62.6 meq/100 g) of the clay, with a reaction time of 8 h at temperatures of 25 and 80°C. X-ray diffraction (XRD) results confirmed the intercalation for both in natura and activated samples. The Fourier-transform infrared (FTIR) spectroscopy and XRD results showed that the ratio of gauche/trans conformers decreased with increased basal spacing. The results of thermodifferential and thermogravimetric analysis (DTA/DTG) confirmed the thermal stability of the organoclay up to 200°C, permitting the use of such material in the synthesis of polymer/clay nanocomposites obtained by the melt blending. Thus, Mg-montmorillonite can be intercalated with alkylammonium ions without prior Na-activation to form organoclays. The possibility of using natural (non-activated) Mg-montmorillonite represents a significant difference in terms of processing cost in comparison with existing Ca-montmorillonite in Brazil or even with imported bentonites that require Na-activation during beneficiation 2021-09-23T13:37:01Z 2021-09-23T13:37:01Z 2016-03-01 article CAVALCANTE, Manoella Silva; PAZ, Simone Patrícia Aranha; ANGÉLICA, Rômulo Simões; ITO, Edson Noryuki; NEVES, Roberto Freitas. Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation. Clay Minerals, [S.L.], v. 51, n. 1, p. 39-54, mar. 2016. Disponível em: https://pubs.geoscienceworld.org/claymin/article-abstract/51/1/39/311533/Organophilization-of-a-Brazilian-Mg?redirectedFrom=fulltext. Acesso em: 27 abr. 2021. http://dx.doi.org/10.1180/claymin.2016.051.1.04. 0009-8558 1471-8030 https://repositorio.ufrn.br/handle/123456789/37977 10.1180/claymin.2016.051.1.04 fr Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Mineralogical Society
institution	Repositório Institucional
collection	RI - UFRN
language	French
topic	Mg-montmorillonite Organoclay Smectite Bentonite Sodium activation
spellingShingle	Mg-montmorillonite Organoclay Smectite Bentonite Sodium activation Ito, Edson Noryuki Cavalcante, Manoella Silva Paz, Simone Patrícia Aranha Angélica, Rômulo Simões Neves, Roberto Freitas Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation
description	The use of Mg-montmorillonite in the production of organoclay without sodium activation was investigated. For this purpose, organophilization experiments were carried out by varying the concentration of two surfactants: hexadecyltrimethylammonium (HDTMA+) and dodecyltrimethy-lammonium (DTMA+) ions. These surfactants were used at concentrations 0.7, 1.0 and 1.5 times that of the cation exchange capacity (62.6 meq/100 g) of the clay, with a reaction time of 8 h at temperatures of 25 and 80°C. X-ray diffraction (XRD) results confirmed the intercalation for both in natura and activated samples. The Fourier-transform infrared (FTIR) spectroscopy and XRD results showed that the ratio of gauche/trans conformers decreased with increased basal spacing. The results of thermodifferential and thermogravimetric analysis (DTA/DTG) confirmed the thermal stability of the organoclay up to 200°C, permitting the use of such material in the synthesis of polymer/clay nanocomposites obtained by the melt blending. Thus, Mg-montmorillonite can be intercalated with alkylammonium ions without prior Na-activation to form organoclays. The possibility of using natural (non-activated) Mg-montmorillonite represents a significant difference in terms of processing cost in comparison with existing Ca-montmorillonite in Brazil or even with imported bentonites that require Na-activation during beneficiation
format	article
author	Ito, Edson Noryuki Cavalcante, Manoella Silva Paz, Simone Patrícia Aranha Angélica, Rômulo Simões Neves, Roberto Freitas
author_facet	Ito, Edson Noryuki Cavalcante, Manoella Silva Paz, Simone Patrícia Aranha Angélica, Rômulo Simões Neves, Roberto Freitas
author_sort	Ito, Edson Noryuki
title	Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation
title_short	Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation
title_full	Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation
title_fullStr	Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation
title_full_unstemmed	Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation
title_sort	organophilization of a brazilian mg-montmorillonite without prior sodium activation
publisher	Mineralogical Society
publishDate	2021
url	https://repositorio.ufrn.br/handle/123456789/37977
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_version_	1773958248945156096

Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation

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