Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) (방사성폐기물학회지)

Korean Radioactive Waste Society (한국방사성폐기물학회)
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Capture of Volatile Organic Iodine Species Using Mordenites

  • Received : 2022.06.14
  • Accepted : 2022.12.28
  • Published : 2023.06.30
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Abstract

The emission of off-gas streams from used fuel recycling is a concern in nuclear energy usage as they contain radioactive compounds, such as, 3H, 14C, 85Kr, 131I, and 129I that can be harmful to human health and environment. Radioactive iodine, 129I, is particularly troublesome as it has a half-life of more than 15 million years and is prone to accumulate in human thyroid glands. Organic iodides are hazardous even at very low concentrations, and hence the capture of 129I is extremely important. Dynamic adsorption experiments were conducted to determine the efficiency of sodium mordenite, partially exchanged silver mordenite, and fully exchanged silver mordenite for the removal of methyl iodide present at parts per billion concentrations in a simulated off-gas stream. Kinetic analysis of the system was conducted incorporating the effects of diffusion and mass transfer. The possible reaction mechanism is postulated and the order of the reaction and the values of the rate constants were determined from the experimental data. Adsorbent characterization is performed to investigate the nature of the adsorbent before and after iodine loading. This paper will offer a comprehensive understanding of the methyl iodide behavior when in contact with the mordenites.

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References

  1. LibreTexts Chemistry. January 23 2021. "United States Commercial Nuclear Power Reactors." LibreTexts Libraries. Accessed Jul. 20 2021. Available from: https://chem.libretexts.org/@go/page/160753.
  2. M.F. Simpson, "Nuclear Fuel Reprocessing Technologies and Commercialization", Sci. Tech. Nucl. Install., 2013, 815693 (2013).
  3. J.R. Lamarsh and A.J. Baratta, Introduction to Nuclear Engineering, 3rd ed., 217-218, Prentice-Hall, New Jersey (2001).
  4. R.T. Jubin. December 16 2008. "Spent Fuel Reprocessing." The Consortium for Risk Evaluation With Stakeholder Participation III (Cresp.org) Short Course on Introduction to Nuclear Chemistry and Fuel Cycle Separations. Accessed Dec. 30 2020. Available from: http://www.cresp.org/NuclearChemCourse/mono-graphs/07_Jubin_Introduction%20to%20Nuclear%20Fuel%20Cycle%20Separations%20-%20Final%20rev%202_3_2_09.pdf.
  5. S.H. Bruffey, R.T. Jubin, and J.A. Jordan, "Capture of Elemental and Organic Iodine From Dilute Gas Streams by Silver-exchanged Mordenite", Procedia Chem., 21, 293-299 (2016). https://doi.org/10.1016/j.proche.2016.10.041
  6. K. Umadevi and D. Mandal, "Performance of Radio-iodine Discharge Control Methods of Nuclear Reprocessing Plants", J. Environ. Radioact., 234, 106623 (2021).
  7. R.T. Jubin, "Organic Iodine Removal From Simulated Dissolver Off-gas Streams Using Silver-exchanged Mordenite", 16th DOE Nuclear Air- Cleaning Conference, Conf-801038-1 (draft), October 20-23, 1980, San Diego, California.
  8. J. Huve, A. Ryzhikov, H. Nouali, V. Lalia, G. Auge, and T.J. Daou, "Porous Sorbents for the Capture of Radioactive Iodine Compounds: A Review", RSC Adv., 8(51), 29248-29273 (2018). https://doi.org/10.1039/C8RA04775H
  9. D.R. Haefner and T.J. Tranter. Methods of Gas-Phase Capture of Iodine From Fuel Reprocessing Off-Gas: A Literature Survey, Idaho National Laboratory Technical Report, INL/EXT-07-12299 (2007).
  10. N.R. Soelberg, T.G. Garn, M.R. Greenhalgh, J.D. Law, R. Jubin, D.M. Strachan, and P.K. Thallapally, "Radioactive Iodine and Krypton Control for Nuclear Fuel Reprocessing Facilities", Sci. Tech. Nucl. Install., 2013, 702496 (2013).
  11. J. Wang, D. Fan, C. Jiang, and L. Lu, "Host-guest Interaction-mediated Nanointerface Engineering for Radioiodine Capture", Nano Today, 36, 101034 (2021).
  12. M. Chebbi, B. Azambre, L. Cantrel, M. Huve, and T. Albiol, "Influence of Structural, Textural and Chemical Parameters of Silver Zeolites on the Retention of Methyl Iodide", Microporous Mesoporous Mater., 244, 137-150 (2017). https://doi.org/10.1016/j.micromeso.2017.02.056
  13. S. Chibani, M. Chebbi, S. Lebegue, T. Bucko, and M. Badawi, "A DFT Investigation of the Adsorption of Iodine Compounds and Water in H-, Na-, Ag-, and Cu-Mordenite", J. Chem. Phys., 144(24), 244705 (2016).
  14. VICI Valco Instruments Co., Inc. "Dynacalibrator Model 230 Instruction Manual." VICI homepage. Accessed Dec. 30 2020. Available from: https://www.vici.com/support/manuals/dyna230.pdf.
  15. KIN-TEK Analytical, Inc. "How Permeation Tubes Work." KIN-TEK homepage. Accessed Dec. 30 2020. Available from: https://kin-tek.com/how-permeationtubes-work.
  16. R.D. Scheele, L.L. Burger, and C.L. Matsuzaki. Methyl Iodide Sorption by Reduced Silver Mordenite, Pacific Northwest Laboratory Report, PNL-4489 (1983).
  17. T.M. Nenoff, M.A. Rodriguez, N. Soelberg, and K.W. Chapman, "Silver-Mordenite for Radiologic Gas Capture From Complex Streams: Dual Catalytic CH3I Decomposition and I Confinement", Microporous Mesoporous Mater., 200, 297-303 (2014). https://doi.org/10.1016/j.micromeso.2014.04.041
  18. H. Goettsche, K. Raja, P. Sabharwall, and V. Utgikar, "Treatment of Off-Gas Emissions: Kinetics of Silver Mordenite Catalyzed Methyl Iodide Decomposition", Chem. Eng. J. Adv., 10, 100290 (2022).
  19. U.S. Environmental Protection Agency, Method 3050B: Acid Digestion of Sediments, Sludges, and Soils, Revision 2, Washington, DC (1996).
  20. J.H.A. Kiel, W. Prins, and W.P.M. van Swaaij, "Mass Transfer Between Gas and Particles in a Gas-Solid Trickle Flow Reactor", Chem. Eng. Sci., 48(1), 117-125 (1993). https://doi.org/10.1016/0009-2509(93)80288-2
  21. B.E. Wilkerson, "The Adsorption of Argon and Oxygen on Silver Mordenite", M.S.Ch.E. The Ohio State University, Master's thesis (1990).