Thermogravimetric analysis of tetradecyltrimethylammonium bromide-modified beidellites

Yet Hong Lim, Balázs Zsirka, Erzsébet Horváth, Janos Kristóf, Sara Couperthwaite, Ray L. Frost, Godwin A. Ayoko, Yunfei Xi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The surfaces of natural beidellite clay were modified with cationic surfactant, tetradecyltrimethylammonium bromide, at different concentrations. The organo-beidellites were analysed using thermogravimetric analysis which shows four thermal oxidation/decomposition steps. The first step of mass loss is observed from room temperature to 130 °C due to the dehydration of adsorbed water. The second step of mass loss between 130 and 400 °C is attributed to the oxidation step of the intercalated organic surfactant with the formation of charcoal. The third mass loss happens between 400 and 500 °C which is assigned to the loss of hydroxyl groups on the edge of clays and the further oxidation step of charcoal. The fourth step is ascribed to the loss of structural OH units as well as the final oxidation/decomposition step of charcoal which takes place between 500 and 700 °C. Thermogravimetric analysis has proven to be a useful tool for estimating loaded surfactant amount.

Original languageEnglish
Pages (from-to)67-71
Number of pages5
JournalJournal of Thermal Analysis and Calorimetry
Volume120
Issue number1
DOIs
Publication statusPublished - Mar 30 2015

Keywords

  • Beidellite
  • Organo-clay
  • Tetradecyltrimethylammonium bromide
  • Thermogravimetric analysis

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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