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

Subjects: Nuclear Science and Technology >> Nuclear Materials and Techniques submitted time 2023-06-18 Cooperative journals: 《Nuclear Science and Techniques》

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

Abstract： 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, D_e, and accessible porosity, _acc, were measured in order to evaluate the impact of humic acid on Re(VII) diffusion. The D_e value was in the range of (5.2–8.3)×10^-12 m²/s. The diffusion of Re(VII) was enhanced in the presence of HA, and the D_e 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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