Adsorption behavior of Me-2-CA-BTP/SiO2-P adsorbent toward MA(III) and Ln(III) in nitrate solution

作者：Ning, Shunyan; Zou, Qing; Wang, Xinpeng; Liu, Ruiqin; Wei, Yuezhou^*

来源：Science China Chemistry, 2016, 59(7): 862-868.

DOI：10.1007/s11426-015-0390-2

• HLLW
• minor actinides
• Me-2-CA-BTP/SiO2-P adsorbent
• separation
• lanthanide

A porous Me-2-CA-BTP/SiO2-P adsorbent was prepared to separate MA(III) from Ln(III) in high level liquid waste (HLLW). The adsorption behavior of Me-2-CA-BTP/SiO2-P toward Am-241(III) and Ln(III) in 0.01 M HNO3-NaNO3 solution was studied. Me-2-CA-BTP/SiO2-P showed high adsorption and selectivity toward Am-241(III) over Ln(III) fission products with the separation factor (SF) reaching to 557, 2355, 1952, 1082, 214, 105, 86, 14 for Y, La, Ce, Nd, Sm, Eu, Gd and Dy respectively in 0.01 M HNO3-0.99 M NaNO3 solution. The adsorption kinetics of both Dy(III) and Eu(III) on Me-2-CA-BTP/SiO2-P was studied and followed pseudo-second-order rate equation indicating chemical sorption as the rate-limiting step of the adsorption, and the adsorption isotherm of Dy(III) and Eu(III) matched better with the Langmuir isotherm than the Freundlich isotherm with the adsorption amount around 0.22 and 0.20 mmol/g respectively. Thermodynamic study revealed that the adsorption of both Dy(III) and Eu(III) on Me-2-CA-BTP/SiO2-P was spontaneous and endothermic processes with a positive entropy at 298, 308, 313 K.

• 出版日期2016-7
• 单位上海交通大学