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使用基于二氧化硅的吸附剂NTAamide(C8)/SiO-P从模拟高放废液中高效选择性去除钯

Efficient and Selective Removal of Palladium from Simulated High-Level Liquid Waste Using a Silica-Based Adsorbent NTAamide(C8)/SiO-P.

作者信息

Shi Jiaxuan, Wang Junli, Wang Wentao, Wu Xuan, Wang Hui, Li Jianwei

机构信息

State Key Laboratory of Chemical Resource Engineering, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

Department of Radiochemistry, China Institute of Atomic Energy, Beijing 102413, China.

出版信息

Nanomaterials (Basel). 2024 Mar 20;14(6):544. doi: 10.3390/nano14060544.

DOI:10.3390/nano14060544
PMID:38535692
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10974362/
Abstract

In order to realize the effective separation of palladium from high-level liquid waste (HLLW), a ligand-supported adsorbent (NTAamide(C8)/SiO-P) was prepared by the impregnation method in a vacuum. The SiO-P carrier was synthesized by in situ polymerization of divinylbenzene and styrene monomers on a macroporous silica skeleton. The NTAamide(C8)/SiO-P adsorbent was fabricated by impregnating an NTAamide(C8) ligand into the pore of a SiO-P carrier under a vacuum condition. The adsorption performance of NTAamide(C8)/SiO-P in nitric acid medium has been systematically studied. In a solution of 0.2 M HNO, the distribution coefficient of Pd on NTAamide(C8)/SiO-P was 1848 mL/g with an adsorption percentage of 90.24%. With the concentration of nitric acid increasing, the adsorption capacity of NTAamide(C8)/SiO-P decreases. Compared to the other 10 potential interfering ions in fission products, NTAamide(C8)/SiO-P exhibited excellent adsorption selectivity for Pd(II). The separation factor (SF > 77.8) is significantly higher than that of similar materials. The interference of NaNO had a negligible effect on the adsorption performance of NTAamide(C8)/SiO-P, which maintained above 90%. The adsorption kinetics of Pd(II) adsorption on NTAamide(C8)/SiO-P fits well with the pseudo-second order model. The Sips model is more suitable than the Langmuir and Freundlich model for describing the adsorption behavior. Thermodynamic analysis showed that the adsorption of Pd(II) on NTAamide(C8)/SiO-P was a spontaneous, endothermic, and rapid process. NTAamide(C8)/SiO-P also demonstrated good reusability and economic feasibility.

摘要

为了实现从高放废液（HLLW）中有效分离钯，通过真空浸渍法制备了一种配体负载型吸附剂（NTAamide(C8)/SiO-P）。SiO-P载体是通过在大孔二氧化硅骨架上原位聚合二乙烯基苯和苯乙烯单体合成的。NTAamide(C8)/SiO-P吸附剂是在真空条件下将NTAamide(C8)配体浸渍到SiO-P载体的孔中制备而成。系统研究了NTAamide(C8)/SiO-P在硝酸介质中的吸附性能。在0.2 M HNO溶液中，钯在NTAamide(C8)/SiO-P上的分配系数为1848 mL/g，吸附率为90.24%。随着硝酸浓度的增加，NTAamide(C8)/SiO-P的吸附容量降低。与裂变产物中的其他10种潜在干扰离子相比，NTAamide(C8)/SiO-P对Pd(II)表现出优异的吸附选择性。分离因子（SF > 77.8）明显高于同类材料。NaNO的干扰对NTAamide(C8)/SiO-P的吸附性能影响可忽略不计，吸附率保持在90%以上。Pd(II)在NTAamide(C8)/SiO-P上的吸附动力学符合准二级模型。Sips模型比Langmuir和Freundlich模型更适合描述吸附行为。热力学分析表明，Pd(II)在NTAamide(C8)/SiO-P上的吸附是一个自发、吸热且快速的过程。NTAamide(C8)/SiO-P还表现出良好的可重复使用性和经济可行性。

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本文引用的文献

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