UTILIZING D-R AND TEMKIN ISOTHERMS WITH GCMS EXTERNAL STANDARD TECHNIQUE IN FORECASTING LIQUID PHASE HERBICIDE SORPTION ENERGIES

In this research, isotherm models were utilized to contribute to scholarly knowledge in predicting the forces or energy defining certain adsorption phenomenon. GCMS measurement of equilibrium phase atrazine after adsorption onto Sheanut shells (SS) acid derived activated carbon were fitted into the D-R and Temkin isotherm models for energy data estimation viz; Sorption energy value (BD), mean free energy (ED) and heat of sorption (B). They were estimated as 0.7600mol2KJ-2, 0.8111 kjmol-1 and 0.790 Jmol-1 respectively. The parameter predicting the type of adsorption was evaluated. Estimated values of B < 20kJ/mol and ED< 8 is an indication that physisorption (Non specific adsorption) dominates chemisorption and ion exchange. The D-R model with a higher correlation coefficient values, R2 = 0.979 proves a better choice in explaining sorption energies. Generally, sheanut shells can be used as alternative precursors for activated carbon production via the two steps and acid treatment method.