One-pot synthesis of a novel mesoporous hydroxyl oxidize iron functional Na-zirconium phosphate (FeOOH-NaZrH(PO)·HO) composites was firstly characterized and investigated its Co(II) adsorption from aqueous solution. Compared to NaZrH(PO)·HO (65.7 mg⋅g), the maximum Co(II) adsorption capacity of FeOOH-NaZrH(PO)·HO was improved to be 95.1 mg⋅g. BET verified the mesoporous structures of FeOOH-NaZrH(PO)·HO with a larger pore volume than NaZrH(PO)·HO. High pH values, initial Co(II) concentration, and temperature benefited the Co(II) adsorption. Kinetics, isotherms, and thermodynamics indicated an endothermic, spontaneous chemisorption process. FeOOH-NaZrH(PO)·HO has a better Co(II) adsorption selectivity than that of NaZrH(PO)·HO. In particular, FeOOH-NaZrH(PO)·HO exhibited an outstanding reusability after ten cycles of tests. The main possible mechanism for adsorbents uptake Co(II) involved in ion exchange, electrostatic interaction, and -OH, Zr-O bond coordination based on FTIR and XPS analysis. This work presents a feasible strategy to prepare novel modified zirconium phosphate composites for extracting Co(II) from solutions and providing a new insight into the understanding of Co(II) adsorption in the real nuclear Co(II)-containing wastewater.
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