Experimental and modeling study of the diffusion path of Ce(III)-EDTA in compacted bentonite

被引:6
作者
Wu, Tao [1 ]
Hong, Yujie [1 ]
Shao, Dongchen [1 ]
Zhao, Jiatong [1 ]
Feng, Zhengye [1 ]
机构
[1] Huzhou Univ, Dept Engn, Huzhou 313000, Peoples R China
关键词
Diffusion coefficient; Diffuse double layer; Bentonite; Multi-porosity model; Through-diffusion experiment; WEIGHT ORGANIC-COMPOUNDS; ANION-EXCLUSION; EDTA; RADIONUCLIDES; COEFFICIENTS; ADSORPTION; TRANSPORT; BEHAVIOR; RE(VII); RICH;
D O I
10.1016/j.chemgeo.2023.121639
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The impact of the diffuse double-layer on the diffusion of radionuclide anions remains unclear, impeding the application of Archie's law for adsorptive anions. Through-diffusion experiments were carried out to measure the effective diffusion coefficient and distribution coefficient of Ce(III) in the presence of EDTA. A multi-porosity model, in combination with Archie's law, was used to estimate the effective diffusion coefficient. The predominant species, CeEDTA-, exhibited an effective diffusion coefficient of (0.88-1.92) x 10-11 m2/s and the distribution coefficient of (0.81-1.18) x 10-3 m3/kg at the compacted dry density of 1300-1800 kg/m3. The accessible porosity, the diffuse double-layer porosity, and the interlayer porosity were analyzed using the multiporosity model, based on the characterization of bentonite via Scanning electron microscopy with energy dispersive spectrometry, X-ray diffractometer, and Nitrogen-Brunner-Emmett-Teller method. Due to the low external surface area of Zhisin bentonite (27.7-35.3 m2/g), the impact of the diffuse double-layer was insignificant on the total and accessible porosities. Additionally, the diffuse double-layer porosity had insignificant impact on the effective diffusion coefficient of CeEDTA- in compacted bentonite, as its value was one order magnitude lower than that of the interlayer porosity and the accessible porosity.
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页数:7
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