Ansari S A, Mohapatra P K, Manchanda V K
Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Talanta. 2007 Oct 31;73(5):878-85. doi: 10.1016/j.talanta.2007.05.007. Epub 2007 May 18.
A novel chelating polymeric material was synthesized by chemical anchoring of N,N'-dimethyl-N,N'-dibutyl malonamide (DMDBMA) with chloromethylated polystyrene-divinyl benzene polymer. The polymeric material thus prepared was characterized by (13)C NMR, FT-IR spectroscopy and CHN elemental analysis. The fabricated polymeric material exhibited superior binding for hexa-valent and tetra-valent metal ions such as U(VI) and Th(IV). Various physico-chemical properties of the functionalized polymer like phase adsorption kinetics, metal sorption mechanism and metal sorption capacity was studied in the static method. Adsorption kinetics studies show that <20min was sufficient for >99.99% adsorption of Th(IV) and U(VI). The kinetics for adsorption of U(VI) and Th(IV) was found to follow the first order Lagergren rate kinetics. Adsorption of U(VI) on the malonamide functionalized polymer followed the Langmuir adsorption isotherm. The Langmuir monolayer adsorption phenomenon was also confirmed by the theoretical approach calculated based on the adsorption kinetics. The metal sorption capacities for uranium and thorium were found to be 18.78+/-1.53mg and 15.74+/-1.59mg/g of the chelating polymer at 3M HNO(3), respectively.
通过将N，N'-二甲基-N，N'-二丁基丙二酰胺（DMDBMA）与氯甲基化聚苯乙烯-二乙烯基苯聚合物进行化学锚固，合成了一种新型螯合聚合物材料。通过（13）C NMR、傅里叶变换红外光谱（FT-IR）和CHN元素分析对由此制备的聚合物材料进行了表征。所制备的聚合物材料对六价和四价金属离子（如U（VI）和Th（IV））表现出优异的结合能力。采用静态法研究了功能化聚合物的各种物理化学性质，如相吸附动力学、金属吸附机理和金属吸附容量。吸附动力学研究表明，<20分钟足以使Th（IV）和U（VI）的吸附率>99.99%。发现U（VI）和Th（IV）的吸附动力学遵循一级Lagergren速率动力学。U（VI）在丙二酰胺功能化聚合物上的吸附遵循Langmuir吸附等温线。基于吸附动力学计算的理论方法也证实了Langmuir单层吸附现象。在3M HNO（3）条件下，螯合聚合物对铀和钍的金属吸附容量分别为18.78±1.53mg和15.74±1.59mg/g。
