ADSORPTION PROPERTIES OF SOME CATIO-SUBSTITUTED FORMS OF BENTONITES

Adsorption of nitrogen and methylene blue (MB) on modified forms of bentonite from Dash-Salahly deposit has been studied. It revealed that as charge of exchangeable cations rises, values of specific surface of bentonite increase as well. It showed that the first endothermic effect on DTA curves are observed at temperatures 100-140 ºC that characterizes physically adsorbed MB molecules from surface of bentonite samples. This fact was also confirmed by calculated data by MB desorption energy on reviewed samples: the value range between 64.38-99.74 kj/mol. It has established that exothermic effects with maximums 260-660 ºC describe partial oxidation of adsorbed molecules of MB on surface of bentonite samples.