In this study, removing Fe(II) and Mn(II) through adsorption on greensand along with changes in the contact time, initial concentrations of the adsorbent, Fe(II) and Mn(II) and pH in a batch system was investigated. Also, results obtained from the experiment conducted on Freundlich and Langmuir isotherms and pseudo-first and second-order kinetic models were studied. Results showed that the removal efficiency of the adsorbent decreased to pH and iron/manganese concentrations increased. On the other hand, it increased with an increase in the primary concentration of the adsorbent and the contact time. Maximum adsorption for both adsorbents at pH 5 was achieved and adsorption capacity of the glauconitic greensand for Fe(II) and Mn(II) were 11.5 and 11.8 mg/g, respectively. Obtained results from equilibrium studies revealed that Fe(II) and Mn(II) adsorption process on the adsorbent followed the pseudo-second-order kinetic and Langmuir and Freundlich’s isotherm models. In all, the experiment results indicated that the adsorption process on glauconite could be used as an effective method for removing Fe(II) and Mn(II) in aqueous solutions.
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Naghipour et al. (2020) studied this question.
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