Effect of sand particle-size and U(VI) concentration on the co-transport of U(VI) and humic acid in saturated porous media

IF 1.5 3区化学 Q3 CHEMISTRY, ANALYTICAL

Journal of Radioanalytical and Nuclear Chemistry Pub Date : 2025-03-27 DOI:10.1007/s10967-025-10034-0

Liu Yuanyuan, Gao Bai, Weng Xingpan, Yi Ling, Gao Mingqiang, Chen Gongxin

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Abstract

The migration of U(VI) in groundwater environment is influenced by hydrochemical environment and water-bearing medium. In this study, column experiments were conducted to investigate the effect of quartz sand particle-size and U(VI) concentration in the U(VI)-HA system. It was found that the migration rate of U(VI) in coarse sand (0.25 ~ 0.5 mm) was faster than that in fine sand (0.075 ~ 0.25 mm) and medium sand (0.5-2 mm) in individual U(VI), because of the smaller specific surface area of coarse sand. With the increase of sand size and the U(VI) concentration, the migration rate of U(VI) increases faster and the maximum outflow ratio (C/C₀) adds. The migration of HA in quartz sand column was little affected by sand size. HA is a weakly acidic colloid with negative charge, and the surface of quartz sand also carries negative charge. The mutual electrostatic repulsion counteracts the influence degree of sand particle-size. HA (50 mg/L) promotes U(VI) migration in the U(VI)-HA system, while the influence of sand size and the U(VI) concentration on the U(VI) migration is weakened. The main reason are the competitive adsorption between HA and sand surface and the formation of U(VI)-HA complex.

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砂粒度和U（VI）浓度对U（VI）与腐植酸在饱和多孔介质中共输运的影响

U（VI）在地下水环境中的迁移受水化学环境和含水介质的影响。本研究通过柱状实验考察了石英砂粒径和U（VI）浓度对U(VI)-HA体系的影响。结果表明，由于粗砂的比表面积较小，U（VI）在粗砂（0.25 ~ 0.5 mm）中的迁移速度比细砂（0.075 ~ 0.25 mm）和中砂（0.5 ~ 2 mm）中的迁移速度快。随着砂粒和U（VI）浓度的增加，U（VI）的迁移速率加快，最大流出比（C/C0）增大。石英砂柱中HA的运移受砂粒的影响较小。透明质酸是带负电荷的弱酸性胶体，石英砂表面也带负电荷。相互的静电斥力抵消了砂粒度的影响程度。50 mg/L的HA促进了U(VI)-HA体系中U（VI）的迁移，而砂粒和U（VI）浓度对U（VI）迁移的影响减弱。其主要原因是HA与砂表面的竞争吸附和U(VI)-HA络合物的形成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Radioanalytical and Nuclear Chemistry 化学-分析化学

CiteScore

2.80

自引率

18.80%

发文量

504

审稿时长

2.2 months

期刊介绍： An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.