Hostname: page-component-848d4c4894-5nwft Total loading time: 0 Render date: 2024-05-13T14:37:13.507Z Has data issue: false hasContentIssue false
  • English
  • Français

Sorption of Uranium(6+) and Neptunium(5+) by Surfactant-Modified:Natural Zeolites

Published online by Cambridge University Press:  10 February 2011

James D. Prikryl  and
Roberto T. Pabalan
James D. Prikryl
Affiliation:
Center for Nuclear Waste Regulatory Analyses, Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78238–5166(jprikryl@swri.edu; rpabalan@swri.edu)
Roberto T. Pabalan
Affiliation:
Center for Nuclear Waste Regulatory Analyses, Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78238–5166(jprikryl@swri.edu; rpabalan@swri.edu)
Get access

Abstract

Experiments were conducted to determine the ability of surfactant-modification to enhance the ability of natural zeolites to sorb U(6+) and Np(5+). Natural zeolite material, comprised mainly of clinoptilolite and treated with the cationic surfactant exadecyltrimethylammonium-bromi(le (IDTMA), was reacted with U(6+) and Np(5+) solutions open to the atmosphere and having a range of radionuclide concentration, pH, and NaCI concentration. The results indicate surfactantmodification of the zeolite enhances its ability to sorb U(6+), particularly at pHs greater than six where U(6+) sorption on unmodified zeolite is typically low due to formation of anionic U(6+) aqueous carbonate complexes. In contrast, there is little enhancement of Np(5+) sorption onto surfactant-modified zeolite. The presence of chloride anions in solution makes surfactantmodification less effective. The enhanced sorption of U(6+) is interpreted to be due to anion exchange with counterions on the external portion of a surfactant bilayer or admicelles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 556: Symposium QQ – Scientific Basis for Nuclear Waste Management XXII , 1999 , 1035
Copyright
Copyright © Materials Research Society 1999

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Haggerty, G. and Bowman, R., Environ. Sci. Technol. 28, p. 452 (1994).Google Scholar
2. Fuhrmann, M., Aloysius, D., and Zhou, H., Waste Management ‘95, February 26-March 2, 1995, Tucson, AZ.Google Scholar
3. Howden, M. and Pilot, J., in Ion Exchange Technology, edited by Naden, D. and Streat, M. (Ellis Horwood Limited, Chichester, U.K. 1984), p. 66.Google Scholar
4. Robinson, S., Kent, T., and Arnold, W., in Natural Zeolites ‘93: Occurrence, Properties, Use, edited by Ming, D. and Mumpton, F. (International Committee on Natural Zeolites, Brockport, NY 1995), p. 579.Google Scholar
5. Pansini, M., Mineral. Deposita 31, p. 563 (1996).Google Scholar
6. Kallo, D., in Natural Zeolites ‘93: Occurrence, Properties, Use, edited by Ming, D. and Mumpton, F. (International Committee on Natural Zeolites, Brockport, NY 1995), p. 341.Google Scholar
7. Bremner, P. and Schultze, L., in Natural Zeolites ‘93: Occurrence, Properties, Use, edited by Ming, D. and Mumpton, F. (International Committee on Natural Zeolites, Brockport, NY 1995), p. 397.Google Scholar
8. Zamzow, M. and Schultze, L., in Natural Zeolites ‘93: Occurrence, Properties, Use, edited by Ming, D. and Mumpton, F. (International Committee on Natural Zeolites, Brockport, NY 1995), p. 405.Google Scholar
9. Leppert, D., Geology 50, p. 140 (1988).Google Scholar
10. Valcke, E., Engels, B., and Cremers, A., Zeolites 18, p. 205 (1997).Google Scholar
11. Sullivan, E., Hunter, D., and Bowman, R., Environ. Sci. Technol. 32, p. 1948 (1998)Google Scholar
12. Neel, D. and Bowman, R., in Proc. 36th Annual New Mexico Water Conf, 7-8 November 1991, Las Cruces, NM 1992, p. 57.Google Scholar
13. Flynn, M., Sorption of Chromate and Lead onto Surface-Modified Zeolites. New Mexico Institute of Mining and Technology, Masters Thesis, 1994.Google Scholar
14. Bowman, R., Haggerty, G., Huddleston, R., Neel, D., and Flynn, M. in Surfactant-enhanced Remediation of Subsurface Contamination, edited by Sabatini, D., Knox, R., and Harwell, J. (ACS Symposium Series 594, Washington, D.C. 1995), p. 54.Google Scholar
15. Pabalan, R., Turner, D., Bertetti, F., and Prikryl, J., in Adsorption of Metals by Geomedia, edited by Jenne, E. (Academic Press, San Diego, CA 1998), p. 100.Google Scholar
16. Bertetti, F., Pabalan, R., and Almendarez, M., in Adsorption of Metals by Geomedia, edited by Jenne, E. (Academic Press, San Diego, CA 1998), p. 132.Google Scholar
17. Pabalan, R., Geochim. Cosmochim. Acta 58, p. 4573 (1994).Google Scholar
18. Israelachvili, J., Intermolecular and Surface Forces, 2nd ed., Academic Press, San Diego, CA.Google Scholar
19. Xu, S. and Boyd, S., Environ. Sci. Technol. 29, p. 3022 (1995).Google Scholar
20. Li, Z. and Bowman, R., Environ. Sci. Technol. 31, p. 2407 (1997).Google Scholar
21. Ming, D. and Dixon, J., Clays Clay Min. 35, p. 463 (1987).Google Scholar