Through-and Out-Diffusion of Se(IV) and Re(VII) in Compacted Bentonite

Abstract:

Through-diffusion and out-diffusion are good way to understand anion diffusion behavior in compacted bentonite. In the present work we investigated Re (VII) and Se (IV) diffusion behavior in 2000 kg/m³ compacted GMZ bentonite. The D_e values of Re (VII) and Se (IV) are 0.29 ± 0.02 and 0.77 ± 0.05× 10^-11 m²/s. The result obtained from out-diffusion method was not agreed with predicted data due to the heterogeneous porosity distribution in clay boundaries and species changed when the diffusion occurred in GMZ bentonite. Comparing the D_a values of Se, Tc and I in GMZ and Kunigel-F bentonites, it showed that Kunigel-F bentonite hindered the mobilities of anion more efficiently than GMZ bentonite because of the higher content of montmorillonite.

• Periodical: Advanced Materials Research (Volumes 953-954)
• Pages: 614-620
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.953-954.614
• Online since: June 2014
• Authors: Hai Wang, Tao Wu*, Jiang Chen, Yao Lin Zhao, Chao Hui He, Jin Ying Li
• Keywords: Bentonite, Diffusion Coefficient, Re (VII), Se (IV)

References

[1] Zhijian W. Selection and Basic Properties of the Buffer Material for High-Level Radioactive Waste Repository in China. Acta Geol Sin-engl. 2008; 82(5): 1050-1055.

DOI: 10.1111/j.1755-6724.2008.tb00662.x

[2] Beauwens T DCP, Moors H, Wang L, Maes N. Studying the migration behaviour of selenate in Boom Clay by electromigration. Eng Geol. 2005; 77(3 -4): 285-293.

DOI: 10.1016/j.enggeo.2004.07.019

[3] Zhao Y, Guo Z, Xu J. 99TcO4− diffusion and sorption in compacted GMZ bentonite studied by capillary method. J Radioanal Nucl Chem. 2012: 1-6.

DOI: 10.1007/s10967-012-2329-2

[4] Sato H, Miyamoto S. Diffusion behaviour of selenite and hydroselenide in compacted bentonite. Appl Clay Sci. 2004; 26(1–4): 47-55.

DOI: 10.1016/j.clay.2003.10.007

[5] Li J, Dai W, Xiao G, Wang H, Zhang Z, Wu T. Pertechnetate diffusion in GMZ bentonite. J Radioanal NuclChem. 2012; 293(3): 763-767.

DOI: 10.1007/s10967-012-1733-y

[6] Večerník P, Jedináková-Křížová V. Diffusion of 99-technetium in compacted bentonite under aerobic and anaerobic conditions. Czech J Phys. 2006; 56(1): D665-D672.

DOI: 10.1007/s10582-006-1081-7

[7] Yu J, Neretnieks I. Diffusion and sorption properties of radionuclides in compacted bentonite. Swedish Nuclear Fuel Waste Manage Co, Stockholm, Sweden, SKB TR, 97-12. (1997).

[8] Miller AW, Wang Y. Radionuclide Interaction with Clays in Dilute and Heavily Compacted Systems: A Critical Review. Environ Sci Technol. 2012; 46(4): 1981-(1994).

DOI: 10.1021/es203025q

[9] Molera M, Eriksen T, Jansson M. Anion diffusion pathways in bentonite clay compacted to different dry densities. Appl Clay Sci. 2003; 23(1): 69-76.

DOI: 10.1016/s0169-1317(03)00088-7

[10] Bourg IC, Sposito G, Bourg ACM. Tracer diffusion in compacted, water-saturated bentonite. Clay Clay Miner. 2006; 54(3): 363-374.

DOI: 10.1346/ccmn.2006.0540307

[11] Van Loon LR, Glaus MA, Müller W. Anion exclusion effects in compacted bentonites: Towards a better understanding of anion diffusion. Appl Geochem. 2007; 22(11): 2536-2552.

DOI: 10.1016/j.apgeochem.2007.07.008

[12] Kozaki T, Sato H, Fujishima A, Saito N, Sato S, Ohashi H. Effect of dry density on activation energy for diffusion of strontium in compacted sodium montmorillonite. MRS Proceedings. 1996; 465: 893.

DOI: 10.1557/proc-465-893

[13] Sato H, Ashida T, Kohara Y, Yui M, Sasaki N. Effect of Dry Density on Diffusion of Some Radionuclides in Compacted Sodium Bentonite. J Nucl Sci Technol. 1992; 29(9): 873-882.

DOI: 10.1080/18811248.1992.9731607

[14] Sato H, Yui M, Yoshikawa H. Diffusion Behavior for Se and Zr in Sodium-Bentonite. MRS Online Proceedings Library. 1994; 353: null-null.

DOI: 10.1557/proc-353-269

[15] Wu T, Dai W, Xiao G, Shu F, Yao J, Li J. Influence of dry density on HTO diffusion in GMZ bentonite. J Radioanal Nucl Chem. 2012; 292(2): 853-857.

DOI: 10.1007/s10967-011-1523-y

[16] Wu T, Wang H, Zheng Q, Zhao Y, Li J. Effect of EDTA on the diffusion behavior of 99TcO4 − and ReO4 − in GMZ bentonite. J Radioanal Nucl Chem. 2013: 1-5.

DOI: 10.1007/s10967-013-2831-1

[17] Van Loon LR, Soler JM, Bradbury MH. Diffusion of HTO, 36Cl− and 125I− in Opalinus Clay samples from Mont Terri: Effect of confining pressure. J Contam Hydrol. 2003; 61(1–4): 73-83.

DOI: 10.1016/s0169-7722(02)00114-6

[18] Wu T, Amayri S, Drebert J, Van Loon LR, Reich T. Neptunium(V) sorption and diffusion in Opalinus clay. Environ Sci Technol. 2009; 43(17): 6567-6571.

DOI: 10.1021/es9008568

[19] Wenk H-R, Voltolini M, Mazurek M, Van Loon L, Vinsot A. Preferred orientations and anisotropy in shales: Callovo-Oxfordian shale (France) and Opalinus Clay (Switzerland). Clay Clay Miner. 2008; 56(3): 285-306.

DOI: 10.1346/ccmn.2008.0560301

[20] Glaus MA, Frick S, Rossé R, Van Loon LR. Consistent interpretation of the results of through-, out-diffusion and tracer profile analysis for trace anion diffusion in compacted montmorillonite. J Contam Hydrol. 2011; 123(1–2): 1-10.

DOI: 10.1016/j.jconhyd.2010.11.009

[21] Wu T, Li J, Dai W, Xiao G, Shu F, Yao J, Su Y, Shi L. Effect of dry density on 125I diffusion in GMZ bentonite. Sci China Chem. 2012; 55(9): 1760-1764.

DOI: 10.1007/s11426-012-4695-6

[22] Wang X, Tao Z. Diffusion of 99TcO4- in compacted bentonite: Effect of pH, concentration, density and contact time. J Radioanal Nucl Chem. 2004; 260(2): 305-309.

DOI: 10.1023/b:jrnc.0000027101.01834.1b

[23] Suzuki S, Prayongphan S, Ichikawa Y, Chae B-G. In situ observations of the swelling of bentonite aggregates in NaCl solution. Appl Clay Sci. 2005; 29(2): 89-98.

DOI: 10.1016/j.clay.2004.11.001