Investigation of the surface acidity of a bentonite modified by acid activation and thermal treatment

Alemdaroglu T., Akkus G., ÖNAL M., Sarikaya Y.

TURKISH JOURNAL OF CHEMISTRY, vol.27, no.6, pp.675-681, 2003 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 6
  • Publication Date: 2003
  • Journal Name: TURKISH JOURNAL OF CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.675-681
  • Keywords: acid activation, bentonite, n-butylamine, pore volume, surface acidity, surface area, thermal treatment, PHYSICOCHEMICAL PROPERTIES, MONTMORILLONITE
  • Ankara University Affiliated: Yes

Abstract

The adsorption of n-butylamine from its solution in cyclohexane on acid-activated and thermally treated Kiitahya/Turkey bentonite (KB) samples was followed using a UV-VIS spectrophotometric method. The experimental data were evaluated by the Langmuir adsorption equation and the total number of surface acid centers (n(m)/mol g(-1)) was determined. The variation in n(m) values as a function of the mass percent of H2SO4 used in activation (10%-70%) and its correlation with variations in surface area (A) and pore volume (V) as a function of the mass percent of H2SO4 were investigated for acid-activated KB samples. The variation in n(m) values as a function of thermal treatment temperature (200degreesC-1300degreesC) and its correlation with variations in A and V as a function of thermal treatment temperature were investigated for thermally treated KB samples and the results are discussed.