Eu(III) adsorption using di(2-thylhexly) phosphoric acid-immobilized magnetic GMZ bentonite

In this research, the raw Na-bentonit (S1) collected from Gaomiaozi County (Inner Mongolia, China) (herein named as GMZ bentonite), was utilized as a support to prepare di(2-thylhexly) phosphoric acid-immobilized magnetic GMZ bentonite (S3) for the removal of Eu(III) ions from aqueous solution. The adsorption was performed as a function of pH, contact time, temperature and metal ion concentrations in the batch experiments. The results demonstrated that the adsorption was well described by the Langmuir adsorption isotherm with the maximum adsorption capacity of 40.5 mg/g. The kinetic data indicated that the adsorption fit well with the pseudo-second-order kinetic model. The thermodynamic parameters implied that the adsorption process was spontaneous and exothermic. The recovery could be achieved using a 0.5 M NaCl in 2.0% HCl eluent. The adsorbent was characterized by XRD, SEM, FTIR, Zeta potential and BET. The adsorption mechanism was further confirmed by XPS.

► P204 immobilized magnetic bentonite was synthesis for the removal of Eu(III). ► The removal was affected by pH, temperature, contact time and metal ion concentration. ► The adsorption capacity was compared with other inorganic adsorbent. ► The adsorption mechanism was further confirmed by FTIR and XPS. ► The adsorbent was characterized by SEM, XRD, FTIR, BET, Zeta potential analysis.