Indonesian Journal of Chemistry (Jun 2010)

STUDY OF THERMAL AND ACID STABILITY OF BENTONITE CLAY

  • Karna Wijaya,
  • Ani Setyo Pratiwi,
  • Sri Sudiono,
  • Emi Nurahmi

DOI
https://doi.org/10.22146/ijc.21929
Journal volume & issue
Vol. 2, no. 1
pp. 22 – 29

Abstract

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The thermal and acid stability of the bentonite clays (Na- and Ca-bentonite) have been tested. The thermal stability testing has been carried out by heating 5 gram of the clays for five hours at 200, 300 and 500 °C respectively, meanwhile acid stability testing was performed by immersing 5 gram clays into 100 mL sulphuric acid 1M, 2M and 3M for 24 hours. The tested clays, then were characterized by means of X-Ray difractometry and IR-spectroscopy methods. The characterization results showed that upon heating, both Ca- and Na-bentonites indicated same thermal stability. However, upon acid treatment, Na-bentonite was found relatively stabiler and more resistance then Ca-bentonite. Keywords: bentonite, clay, thermal stability, acid stability.