Sorption Energies Estimation Using Dubinin-Radushkevich and Temkin Adsorption Isotherms

In this study, we add to scholarly knowledge in simple terms, the forces or energy defining certain adsorption phenomenon, using isotherm models. 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 relationships for energy data estimation. Sorption energy value (BD), mean free energy (ED) and heat of sorption (B). They were estimated as 0.7600molKJ, 0.8111 kjmol and 0.790Jmol respectively. The parameter predicting the type of adsorption was evaluated BD , B < 20kJ/mol and ED<8 which is an indication that physisorption (Non specific adsorption) dominates chemisorption and ion exchange. The D-R model with a higher correlation coefficient values, R = 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 schemes. [Sorption Energies Estimations Using Dubinin-Radushkevich and Temkin Adsorption Isotherms. Life Science Journal 2010;7(4):31-39]. (ISSN: 1097-8135).

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