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首页> 外文期刊>Radiochemistry >Kinetic and Thermodynamic Studies for Cesium Removal from Low-Level Liquid Radioactive Waste Using Impregnated Polymeric Material
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Kinetic and Thermodynamic Studies for Cesium Removal from Low-Level Liquid Radioactive Waste Using Impregnated Polymeric Material

机译：浸渍高分子材料去除低水平液态放射性废物中铯的动力学和热力学研究

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摘要

A novel polymeric impregnated material was prepared by loading 4,4'(5')di-t-butylbenzo-18-crown-6 (DtBB 18C6) onto poly(acrylamide-acrylic acid-acrylonitrile)-N,N'-methylenediacrylamide [P(AM-AA-AN)-DAM]. The sorption of ~(137)Cs onto P(AM-AA-AN)-DAM/DtBB 18C6 was studied using batch equilibrium technique with respect to the pH, contact time, and temperature. The applicability to treatment of low-level liquid radioactive waste was examined. The free energy ((DELTA)G~(0)), enthalpy ((DELTA)H~(0)), and entropy ((DELTA)S~(0)) of the sorption were calculated. These parameters showed that the sorption of ~(137)Cs onto P(AM-AA-AN)-DAM/DtBB18C6 was spontaneous and endothermic in nature. The Lagergren first-order, pseudo-second-order, and homogeneous particle diffusion models were tested kinetically to describe the reaction mechanism. The experimental data were fitted well by the pseudo-second-order kinetic model.
机译：通过将4,4'（5'）二叔丁基苯并-18-冠-6（DtBB 18C6）加载到聚（丙烯酰胺-丙烯酸-丙烯腈）-N，N'-亚甲基二丙烯酰胺[ P（AM-AA-AN）-DAM]。关于pH，接触时间和温度，使用间歇平衡技术研究了〜（137）Cs在P（AM-AA-AN）-DAM / DtBB 18C6上的吸附。审查了对处理低含量液体放射性废物的适用性。计算吸附的自由能（ΔG〜（0）），焓（ΔH〜（0））和熵（ΔS〜（0））。这些参数表明，〜（137）Cs在P（AM-AA-AN）-DAM / DtBB18C6上的吸附是自然的并且是吸热的。对Lagergren一级，伪二级和均质粒子扩散模型进行了动力学测试，以描述反应机理。用伪二级动力学模型很好地拟合了实验数据。

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