Adsorpcija T-2 toksina na hektoritu

Abstract

U ovom radu su prikazani rezultati ispitivanja adsorpcije T-2 toksina na mineralu iz grupe smektita-hektoritu, na različitim pH vrednostima (3,0; 7,0 i 9,0). Ispitivanja su pokazala da adsorbovana količina T-2 toksina na hektoritu opada sa porastom sadržaja čvrste faze u suspenziji na svim ispitivanim pH vrednostima. Sa adsorpcionih izotermi se primećuje da sa povećanjem početne koncentracije T-2 toksina raste i adsorpcija T-2 toksina, na svim ispitivanim pH vrednostima. Adsorpcija T-2 toksina na hektoritu se može opisati nelinearanim (Lengmir, Langmuir) tipom izoterme na pH 3,0; 7,0 i 9,0, pri čemu faktor korelacije (r2) iznosi 0,943 na pH 3,0; 0,919 na pH 7,0 i 0,939 na pH 9,0. Maksimalna adsorbovana količina T-2 toksina na hektoritu na osnovu Lengmirove izoterme (9,178 mg g-1 na pH 3,0; 9,930 mg g-1 na pH 7,0 i 19,341 mg g-1 na pH 9,0), ukazuje da je adsorpcija T-2 toksina na hektoritu zavisna od pH. Dobijeni rezultati ukazuju na postojanje specifičnih aktivnih centara na hektoritu na kojima se T-2 toksin adorbuje.

The adsorption of T-2 toxin by the natural smectite mineral-hectorite at pH 3.0, 7.0 and 9.0 was investigated. The results of T-2 toxin adsorption on hectorite showed that the T-2 adsorption capacity decreased with increasing concentration of adsorbent in the suspension for all the investigated pH values. From the adsorption isotherms, an increase in T-2 toxin adsorption with increasing initial T-2 toxin concentration was observed for all the investigated pH values. The T-2 toxin adsorption by hectorite followed a non-linear (Langmuir) type of isotherm at pH 3.0, 7.0 and 9.0, with correlation coefficients (r2) of 0.943 at pH 3.0, 0.919 at pH 7.0 and 0.939 at pH 9.0. The estimated maximum T-2 toxin adsorption by hectorite based on the Langmuir fit to the data (9.178 mg/g at pH 3.0, 9.930 mg/g at pH 7.0, and 19.341 mg/g at pH 9.0), indicated that the adsorption of T-2 toxin by hectorite is pH dependent. The obtained data suggest the existence of specific active sites in hectorite onto which the T-2 toxin is adsorbed.