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Temkin isotherm model

JN James Nyirenda
KZ Kadango Zombe
GK George Kalaba
CS Chipo Siabbamba
IM Inyambo Mukela
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The Temkin isotherm model considers the effect of indirect adsorbate-adsorbent interaction on the adsorption process. It is based on the assumption that the heat of adsorption of all the molecules in a layer decreases linearly due to increase in surface coverage of the adsorbent. The decrease in heat of adsorption is linear rather than logarithmic, as implied in the Freundlich isotherm. Further, the adsorption is characterized by uniform distribution of binding energies, up to a maximum binding energy. The Temkin isotherm model is represented by the following equation53:

where; KT is the equilibrium binding constant (L/mol) corresponding to the maximum binding energy, b is related to the adsorption heat, R is the universal gas constant (8.314 J/K/mol) and T is the temperature at 298 K. The constants KT and b can be calculated from the slope (RT/b) and intercept (RTIn KT/b) of the plot of qe versus ln (Ce)53.

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