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Organophilization of a Brazilian Mg-montmorillonite without prior sodium activation

Published online by Cambridge University Press:  02 January 2018

Manoella Silva Cavalcante ,
Simone Patrícia Aranha Paz ,
Rômulo Simões Angélica ,
Edson Noryuki Ito  and
Roberto Freitas Neves
Manoella Silva Cavalcante*
Affiliation:
Programa de Pós-Graduação em Geologia e Geoquímica, Instituto de Geociências, Universidade Federal do Pará, Campus do Guamá, 66075-110, Belém, Pará, Brazil
Simone Patrícia Aranha Paz
Affiliation:
Faculdade de Engenharia de Materiais, Campus de Ananindeua, Universidade Federal do Pará, Ananindeua, Pará, Brazil
Rômulo Simões Angélica
Affiliation:
Programa de Pós-Graduação em Geologia e Geoquímica, Instituto de Geociências, Universidade Federal do Pará, Campus do Guamá, 66075-110, Belém, Pará, Brazil
Edson Noryuki Ito
Affiliation:
Departmento de Engenharia de Materiais, Universidade Federal do Rio Grande do Norte, Natal-RN, Brazil
Roberto Freitas Neves
Affiliation:
Programa de Pós-Graduação em Geologia e Geoquímica, Instituto de Geociências, Universidade Federal do Pará, Campus do Guamá, 66075-110, Belém, Pará, Brazil
*
*E-mail: manoella.cavalcante@hotmail.com
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Abstract

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 dodecyltrimethylammonium (DTMA+) ions. These surfactantswere 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-transforminfrared (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 suchmaterial 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.

Keywords

Mg-montmorilloniteorganoclaysodium activationsmectitebentonite
Type
Research Article
Information
Clay Minerals , Volume 51 , Issue 1 , March 2016 , pp. 39 - 54
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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