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The amino-hydroxyapatite (HAP-NH2) was synthesized by grafted amino functional groups onto hydroxyapatite. The uranium adsorption performance of HAP-NH2 was studied under different conditions. The results indicated that HAP-NH2 possessed high adsorption capacity (96 mg g−1), wide pH values range (2-8) and fast adsorption rate (20 min). The adsorption kinetic and adsorption isotherm models of HAP-NH2 revealed that the uranium adsorption process was belonged to chemical adsorption. Furthermore, the main forces between uranium ions and HAP-NH2 were attributed to hydroxyl, amino and phosphorous functional groups. [ABSTRACT FROM AUTHOR]

A novel and efficient sorbent: phosphoryl multiwalled carbon nanotubes (PS-MWCNTs) were synthesized by modifying MWCNTs with phosphoryl functional groups. PS-MWCNTs possessed excellent uranium adsorption capacity (194.17 mg g−1) with a wide range of pH values (> 2) and short adsorption equilibrium time (10 min). The isotherm models revealed that the U(VI) adsorption mechanism of PS-MWCNTs mainly belonged to chemical adsorption. Furthermore, the XPS analysis showed that the main forces between uranium ions and PS-MWCNTs were attributed to the phosphoryl functional groups. [ABSTRACT FROM AUTHOR]