Comment on ″Low-cost chitosan-calcite adsorbent development for potential phosphate removal and recovery from...

In the adsorption studies, the accurate estimation of the model parameters contributes to getting insights into adsorption behaviors and optimizing adsorber design. After reading the research work of Pap et al. (2020) carefully, it was found that the fitting results were questionable. Thus, this comment tried to address the following aspects: (i) Correction of the fitting results for the kinetic and isotherm models; (ii) Correct form of the Bohart-Adams model; (iii) Usage of the Clark model; and (iv) Effects of the partial or complete experimental data on the model parameters. This work is expected to help readers better understand the adsorption models and estimate the model parameters.