Effect of humic acid contact time on the diffusion of Re(VII) in GMZ bentonite

分类： 核科学技术 >> 核材料与工艺技术 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》

WANG Hai WU Tao CHEN Jiang FU Bao-Feng ZHAO Xiang-Hai LUO Yong ZHAO Yao-Lin HE Chao-Hui

摘要： The effect of humic acid (HA) on the diffusion of Re(VII) was investigated in compacted Gaomiaozi (GMZ) bentonite by the through- and out- diffusion method. The effective diffusion coefficient, De, and accessible porosity, acc, were measured in order to evaluate the impact of humic acid on Re(VII) diffusion. The De value was in the range of (5.28.3)10-12 m2/s. The diffusion of Re(VII) was enhanced in the presence of HA, and the De value increased with the increase of ageing time, indicating that the formation of HA-Re complexes was slow. Moreover, the acc was in the range of (0.06 0.16), which is less than the total porosity. It implies that the HA-Re complexes are anions.

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