期刊论文

Wu, Tao

英文

Applied Clay Science

0169-1317

2017

141

Jun.

104-110

10.1016/j.clay.2017.02.021

Rhenium, which lies just below technetium in the periodic table of elements, has similar chemical properties as technetium, and is therefore often used as an analogue for the radioactive 99Tc. Our recent work showed that Re(VII) is a good analogue to study the diffusion behaviour of 99Tc(VII) in GMZ bentonite (Wu et al., 2014). The diffusion experiment in GMZ bentonite was conducted at 12 ± 3 °C to get more data in the transient state to obtain a reliable α value, especially for the non-sorbing

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The through-diffusion method was employed to investigate the effect of the salt concentration on the diffusion behaviour of Re(VII) and Se(IV) in compacted bentonite. The accessible porosity, epsilon(acc) of Re(VII) increased from 025 to 0.38 with an increase of the ionic strength from 0.1 to 1.0 mol/L. The dependency of the accessible porosity epsilon(acc) on the salt concentration could be described approximately by a first-order decay exponential function. The interlayer porosity of GMZ bentonite was 21% of the total porosity at a bulk dry density of 1600 kg/m3 at 12 degrees C. The De value...