Prediction of adsorption equilibrium using a modified D–R equation: pure organic compounds on BPL carbon Original Research Article

A method for predicting adsorption equilibrium using a modified Dubinin–Radushkevich (D–R) equation is presented in this paper. We focus on adsorption of pure organic compounds on BPL-activated carbon. We introduce a new variable kv, a volume adjusting coefficient, and simply use Vb, the constant molar volume of the adsorbate at its normal boiling temperature, instead of Vm, the temperature-dependent molar volume of the adsorbate at the adsorption temperature. The model parameters in the modified D–R equation for an adsorbate are predicted from Vb. Overall, the modified D–R equation gives more accurate results than the traditional one.