Preparation of ion-doped amorphous titanium phosphates and their adsorption properties for U(VI)

Amorphous titanium phosphates (ATP) doped with NH 4 + , K + , Na + , and Li + ions (ATP-M, M = NH 4 , K, Na, and Li) were prepared by a co-precipitation method. The SEM&EDS, TGA, XRD characterizations displayed that ATP-M was successfully synthesized, and the doping of NH 4 + , K + , Na + , and Li + ions did not change the crystal form of ATP. The results revealed that the optimum pH value for U(VI) extraction on ATP-M was determined to be 5.0. Moreover, the saturated adsorption capacity obtained by the Langmuir equation for ATP-NH 4 , ATP-K, ATP-Na, and ATP-Li was 505.1, 366.1, 273.3, and 144.1 mg g −1 , respectively. Furthermore, the interaction between ATP-M and U(VI) was discussed. In short, ATP-NH 4 may be an effective adsorbent to remove of U(VI) in wastewater due to its high adsorption ability.