Partially exchanged organophilic bentonites
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Data
2011-09-01
Autores
Dweck, Jo
Barreto, Emerson Paes [UNESP]
Meth, Sergio
Buechler, Pedro Mauricio [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Springer
Resumo
Using a sodium bentonite (VCNa) as substrate differently exchanged organophilic clays were obtained by reaction with hexadecyltrimethylammonium (HDTMA) chloride, at increasing reacting ratios (R) from 20 to 120 meq/100 g of clay (VC20-VC120). The sodium bentonite was previously synthesized from a Verde Claro policationic bentonite (VC) from Bravo, Paraiba State, Brazil. From the thermogravimetric (TG) and derivative thermogravimetric (DTG) analyses of these clays on calcined mass basis and from TG and DTG curves data of VCNa clay, a method was developed to estimate the mass fraction of the exchanged cation present in each organophilic clay (M (org)), as a function of R. When all sodium cations of VCNa are exchanged by HDTMA, the obtained organophilic clay presents a maximum value for M (org). From this value and TG and DTG curves data of VC and VCNa clays, the cation exchange capacity of the original VC bentonite can be estimated.
Descrição
Palavras-chave
Organophilic bentonites, Cation exchange capacity, Calcined mass basis, TG
Como citar
Journal of Thermal Analysis and Calorimetry. Dordrecht: Springer, v. 105, n. 3, p. 907-913, 2011.