M. Onal et al., Investigation of the microporous and mesoporous structures of the Resadiye(Tokat/Turkey) bentonite and its fractions, TURK J CHEM, 25(2), 2001, pp. 241-249
It was determined by X-ray diffraction that, besides containing clay minera
ls such as montmorillonite and illite, the original bentonite contained als
o clinoptilolite, opal-C, quartz, calcite and dolomite, The original benton
ite was separated into four fractions by decantation and precipitation from
its aqueous suspension. The adsorption and desorption of nitrogen on the o
riginal bentonite and its fractions at 77 K were investigated. The specific
surface areas of the samples were determined according to the methods of B
runauer-Emmett-Teller, de Boer-Lippens, and Harkins-Jura by using the adsor
ption data. The mesopore size distribution curves were plotted by using the
desorption data. The specific micropore and the specific micropore-mesopor
e volumes were determined by the extrapolation of these curves. The correla
tion between the specific surface areas and the specific micropore-mesopore
volumes is discussed.