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http://dx.doi.org/10.7733/jnfcwt.2022.001

Surface Modification of Bentonite for the Improvement of Radionuclide Sorption  

Hong, Seokju (Pohang University of Science and Technology)
Kim, Jueun (Pohang University of Science and Technology)
Um, Wooyong (Pohang University of Science and Technology)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.20, no.1, 2022 , pp. 1-12 More about this Journal
Abstract
Bentonite is the most probable candidate to be used as a buffer in a deep geological repository with high swelling properties, hydraulic conductivity, thermal conductivity, and radionuclide sorption ability. Among them, the radionuclide sorption ability prevents or delays the transport of radionuclides into the nearby environment when an accident occurs and the radionuclide leaks from the canister, so it needs to be strengthened in terms of long-term disposal safety. Here, we proposed a surface modification method in which some inorganic additives were added to form NaP zeolite on the surface of the bentonite yielded at Yeonil, South Korea. We confirmed that the NaP zeolite was well-formed on the bentonite surface, which also increased the sorption efficiency of Cs and Sr from groundwater conditions. Both NaP and NaX zeolite can be produced and we have demonstrated that the generation mechanism of NaX and NaP is due to the number of homogeneous/heterogeneous nucleation sites and the number of nutrients supplied from an aluminosilicate gel during the surface modification process. This study showed the potential of surface modification on bentonite to enhance the safety of deep geological radioactive waste repository by improving the radionuclide sorption ability of bentonite.
Keywords
Bentonite; Surface modification; NaP zeolite; Sorption efficiency; Deep geological repository;
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Times Cited By KSCI : 1  (Citation Analysis)
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1 S. Yoon, W.H. Cho, C. Lee, and G.Y. Kim, "Thermal Conductivity of Korean Compacted Bentonite Buffer Materials for a Nuclear Waste Repository", Energies, 11(9), 2269 (2018).   DOI
2 P. Sharma, J.S. Song, M.H. Han, and C.H. Cho, "GISNaP1 Zeolite Microspheres as Potential Water Adsorption Material: Influence of Initial Silica Concentration on Adsorptive and Physical/topological Properties", Sci. Rep., 6, 22734 (2016).   DOI
3 D.A. Dixon, M.N. Gray, and A.W. Thomas, "A Study of the Compaction Properties of Potential Clay-sand Buffer Mixtures for use in Nuclear Fuel Waste Disposal", Eng. Geol., 21(3-4), 247-255 (1985).   DOI
4 W.J. Cho, J.O. Lee, K.S. Chun, and H.S. Park, "Analysis of Functional Criteria for Buffer Material in a Highlevel Radioactive Waste Repository", Nucl. Eng. Technol., 31(1), 116-132 (1999).
5 ONDRAF/NIRAS. Technical Overview of the SAFIR 2 Report: Safety Assessment and Feasibility Interim Report 2, ONDRAF/NIRAS Report, NIROND 2001-05E (2001).
6 G. Harvey and L.S. Dent-Glasser, "Structure and Properties of Aluminosilicate Solutions and Gels", in: Zeolite Synthesis, vol. 398, 49-65, American Chemical Society, Washington DC (1989).
7 D. Meyer and J.J. Howard. Evaluation of Clays and Clay Minerals for Application to Repository Sealing, Office of Nuclear Waste Isolation Technical Report, ONWI-486 (1983).
8 M.N. Gray, S.C.H. Cheung, and D.A. Dixon. The Influence of Sand Content on Swelling Pressures and Structure Developed in Statically Compacted Na-bentonite, Atomic Energy of Canada Limited Report, AECL-7825 (1984).
9 M.V. Villar and P. Rivas, "Hydraulic Properties of Montmorillonite-quartz and Saponite-quartz Mixture", Appl. Clay Sci., 9(1), 1-9 (1994).   DOI
10 M. Kim, S. Lee, E. Cheon, M. Kim, and S. Yoon, "Thermochemical Changes on Swelling Pressure of Compacted Bentonite", Ann. Nucl. Energy, 151, 107882 (2021).   DOI
11 J.P. Lee, H.J. Choi, J.W. Choi, and M. Lee, "Increasing of Thermal Conductivity From Mixing of Additive on a Domestic Compacted Bentonite Buffer", J. Nucl. Fuel Cycle Waste Technol., 11(1), 11-21 (2013).   DOI
12 J.B. Kim, "The Study for Removal of As by the OTA-Br-impregnated Bentonite Adsorbent", KSWST Jour. Wat. Treat., 26(1), 55-67 (2018).   DOI
13 R. Wang, Y. Chu, and M. Chen, "Adsorption Kinetics of 137Cs+/90Sr2+ on Ca-Bentonite", Water Environ. Res., 89(9), 791-797 (2017).   DOI
14 H. Tetsuka, I. Katayama, H. Sakuma, and K. Tamura, "Effects of Humidity and Interlayer Cations on the Frictional Strength of Montmorillonite", Earth Planets Space, 70, 56 (2018).   DOI
15 U. Hakansson, L. Falth, and S. Hansen, "Structure of a High-silica Variety of Zeolite Na-P", Acta Cryst. C46, 1363-1364 (1990).
16 S. Hong and W. Um, "Top-Down Synthesis of NaP Zeolite From Natural Zeolite for the Higher Removal Efficiency of Cs, Sr, and Ni", Minerals, 11(3), 252 (2021).
17 Ch. Baerlocher and W.M. Meier, "The Crystal Structure of Synthetic Zeolite Na-P1, an Isotope of Gismondine", Z. Kristallogr. Cryst. Mater., 135(S), 339-354 (1972).   DOI
18 B.R. Albert, A.K. Cheetham, J.A. Stuart, and C.J. Adams, "Investigations on P Zeolites: Synthesis, Characterization, and Structure of Highly Crystalline low-silica NaP", Microporous Mesoporous Mater., 21(1-3), 133-142 (1998).   DOI
19 M. Hayati-Ashtiani, "Characterization of Nano-Porous Bentonite (Montmorillonite) Particles Using FTIR and BET-BJH Analyses", Part. Part. Syst. Charact., 28(3-4), 71-76 (2011).   DOI
20 Svensk Kaernbraenslefoersoerjning AB, Final Storage of Spent Fuel - KBS-3, Swedish Nuclear Fuel and Waste Management Company, Stockholm (1983).
21 Z. Huo, X. Xu, Z. Lu, J. Song, M. He, Z. Li, Q. Wang, and L. Yan, "Synthesis of Zeolite NaP With Controllable Morphologies", Microporous Mesoporous Mater., 158, 137-140 (2012).   DOI
22 Japan Nuclear Cycle Development Institute. H12: Project to Establish the Scientific and Technical Basis for HLW Disposal in Japan: Supporting Report 2, JNC Report, JNC TN1410 2000-003 (1999).
23 C.R. Kim, J.H. Kim, W.S. Lyoo, C.W. Joo, and H. Jeon, "Swelling Behavior Evaluation of Bentonite With Additives Mixture", Text. Sci. Eng., 46(6), 326-333 (2009).
24 S.Y. Lee and S.J. Kim, "Dehydration Characteristics of Cationic Surfactant-Modified Montmorillonite", J. Miner. Soc. Korea, 15(4), 305-314 (2002).
25 L.H. Johnson, J.C. Tait, D.W. Shoesmith, J.L. Crosthwaite, and M.N. Gray. The Disposal of Canada's Nuclear Fuel Waste: Engineered Barriers Alternatives, Atomic Energy of Canada Limited Report, AECL10718 (1994).
26 H. Mimura and K. Akiba, "Adsorption Behavior of Cesium and Strontium on Synthetic Zeolite P", J. Nucl. Sci. Technol., 30(5), 436-443 (1993).   DOI
27 S. Hansen, U. Hakansson, A.R. Landa-Canovas, and L. Falth, "On the Crystal Chemistry of NaP Zeolites", Zeolites, 13(4), 276-280 (1993).   DOI
28 M.W. Munthali, E. Johan, H. Aono, and N. Matsue, "Cs+ and Sr2+ Adsorption Selectivity of Zeolites in Relation to Radioactive Decontamination", J. Asian Ceram. Soc., 3(3), 245-250 (2015).   DOI
29 U.O. Aroke, A. Abdulkarim, and R.O. Ogubunka, "Fourier-transform Infrared Characterization of Kaolin, Granite, Bentonite, and Barite", ATBU J. Environ. Technol., 6(1), 42-53 (2013).
30 J. Lee, D. Cho, H. Choi, and J. Choi, "Concept of a Korean Reference Disposal System for Spent Fuels", J. Nucl. Sci. Technol., 44(12), 1565-1573 (2007).   DOI