Saha Abhijit, Neogy Suman, Shafeeq P P M, Prajapat C L, Deb Sadhan Bijoy, Saxena Manoj Kumar
Radioanalytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
Talanta. 2021 Aug 15;231:122372. doi: 10.1016/j.talanta.2021.122372. Epub 2021 Mar 30.
One-pot magnetic separation of uranium (U) in seawater and groundwater samples has been made possible by synthesizing phosphoramidate functionalized Ag coated citrate-FeO nanoparticles (NPs). The magnetic saturation value of these functionalized NPs is 27.1 emu g. The synergistic extraction mechanism of U(VI) ion by the surface-modified phosphoramidate and citrate molecules make these NPs highly selective towards U(VI). The adsorption kinetics follows a pseudo-second-order model and the adsorption isotherm fits successfully to the Langmuir adsorption model. The functionalized NPs show quantitative extraction efficiency in the pH range of 6.5-8 with a maximum loading capacity (Q) of 108.7 mg g. The equilibration time required by these functionalized NPs to attain the Q value is 120 s. The recycling of these NPs can be done up to 5-6 times with 1.0 mol L of NaCO or NHOH for quantitative extraction of U(VI). These functionalized NPs show high resilience towards large number of naturally abundant metal ions.
通过合成氨基磷酸酯功能化的Ag包覆柠檬酸盐-FeO纳米颗粒（NPs），实现了对海水和地下水样品中铀（U）的一锅法磁分离。这些功能化纳米颗粒的磁饱和值为27.1 emu g。表面改性的氨基磷酸酯和柠檬酸盐分子对U(VI)离子的协同萃取机制使这些纳米颗粒对U(VI)具有高度选择性。吸附动力学遵循准二级模型，吸附等温线成功拟合朗缪尔吸附模型。功能化纳米颗粒在6.5-8的pH范围内显示出定量萃取效率，最大负载量（Q）为108.7 mg g。这些功能化纳米颗粒达到Q值所需的平衡时间为120 s。使用1.0 mol L的NaCO或NHOH对这些纳米颗粒进行回收，可进行5-6次以定量萃取U(VI)。这些功能化纳米颗粒对大量天然存在的金属离子具有高耐受性。
