Advertisement

Water, Air, and Soil Pollution

, Volume 87, Issue 1–4, pp 73–91 | Cite as

Selective removal of heavy metals from contaminated kaolin by chelators

  • Jihua Hong
  • Peter N. Pintauro
Article

Abstract

The competitive desorption/dissolution of kaolin-adsorbed heavy metal mixtures and mixtures of adsorbed Cd with Mg and/or Ca by four chelators (NTA, EDTA, EGTA, and DCyTA) was investigated. Metals were adsorbed on kaolin at pH 7 and the effects of chelator type and concentration on the extent of metal dissolution was studied at a solution pH of 10. EGTA addition. EGTA was the most effective chelator in selectively removing Cd from kaolin in the presence of adsorbed alkaline-earth metals. Approximately 90% of the adsorbed Ca and Mg were retained on the kaolin until almost all (> 80%) of the cadmium was dissolved by EGTA chelator. NTA was the least effective chelator in selectively dissolving Cd from kaolin contaminated with both Cd and Ca (≈ 45% of the adsorbed Cd could not be removed). All four chelators exhibited some desorption/dissolution selectivity for Cd, Cu, and Pb adsorbed on kaolin. When the concentration of chelator in solution was insufficient to dissolve all adsorbed metals, the observed metal ordering for chelation and dissolution was Cd > Cu > Pb (for EGTA), Cd > Pb > Cu (for EDTA and DCyTA), and Cu > Cd > Pb (for NTA).

Keywords

Heavy Metal EDTA Cadmium EGTA Kaolin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Acar, Y. B., Gale, R. J., Putnum, G. A., Hamed, J. and Wong, R.: 1990, Electrochemical processing of soils: theory of pH gradient development by diffusion and linear convection.J. Environ. Sci. Health 25(6), 687–714.Google Scholar
  2. Alder, A. C., Siegrist, H., Gujer, W. and Giger, W.: 1990,Water Res. 24(6), 733–742.Google Scholar
  3. Anderson, M. L. and Rubin, A. J.: 1980,Adsorption of Inorganics of Solid-Liquid Interface. Ann Arbor Science, Ann Arbor, MI.Google Scholar
  4. Assink, J. W.: 1986, ‘Extractive Methods for Soil Decontamination: A General Survey and Review of Operational Treatment Installations’, in Assink, J. K. and van den Brink, W. J. (eds.),Contaminated Soil. Martinus Nijhoff, Dordrecht, Holland, pp. 655–667.Google Scholar
  5. Brown, G. A. and Elliot, H. A.: 1992,Water, Air, and Soil Pollut. 62, 157–165.Google Scholar
  6. Brown, M. J. and Lester, J. N.: 1979,Water Res. 13, 817–837.Google Scholar
  7. Chubin, R. G. and Street, J.: 1981,J. Environ. Qual. 10(2), 225–228.Google Scholar
  8. Dean, J. A., 1992. Lange's Handbook of Chemistry. 14th ed., McGraw-Hill Book Company, N.Y.Google Scholar
  9. Elliott, H. A. and Brown, G. A.: 1989, Comparative evaluation of NTA and EDTA for extractive decontamination of Pb-polluted soils.Water. Air and Soil Pollt. 45, 361–369.Google Scholar
  10. Garnett, K., Kirk, P. W. W., Lester, J. N. and Perry, R.: 1985, The Effect of Nitrilotraicetic Acid on the Solubilities of Metals in Soil-sludge Mixtures. J. Environ. Qual.14(4), 549–553.Google Scholar
  11. Garnett, K., Kirk, P. W. W., Perry, R. and Lester, T. N.:1986, Nitrilotriacetic Acid in Sludge-amended Soil: Mobility and Effects on Metal Solubility.Environ. Pollut. (series B)12, 145–162.Google Scholar
  12. Hamed, J., Acar, Y. B., Gale, R. J.: 1991, Pb(II) Removal from Kaolinite by Electrokinetics.J. Geotech. Engineer. 117(2), 241–271.Google Scholar
  13. Hong, J. and Pintauro, P. N.: 1995, Desorption-complexation-dissolution Characteristics of Adsobred Cadmium from Soil by Chelators.Water, Air and Soil Pollut. 86,(1–4), 35–50.Google Scholar
  14. Jackson, M. L.: 1964, Chemical Composition of Soils, in Bear, F. E. (ed.),Chemistry of the Soil, 2nd Edt., Reinhold Publishing Corporation, N.Y., pp. 71–141.Google Scholar
  15. Kinniburgh, D. G., Jackson, M. L.: 1980, Cation Adsorption by Hydrous Metal Oxides and Clay, in Anderson, M. A. and Rubin, A. J. (eds.),Adsorption of Inorganics of Solid-Liquid Interface, Ann Arbor Science, Ann Arbor, MI.Google Scholar
  16. Kobayashi, J., Morli, F. and Muramoto, S.: 1974,Trace Subst. Environ. Health 8, 179–192.Google Scholar
  17. Lageman, R., Pool, W. and Seffinga, G.: 1989, Electro-reclamation: Theory and Practice,Chemistry and Industry, (18 Sept.), 585–590.Google Scholar
  18. Lester, J. N., Harrison, R. M. and Perry, R.: 1979, The Balance of Heavy Metals Through a Sewage Treatment Work. I. Lead, Cadmium and Copper,Sci. Total Environ. 12, 12–23.Google Scholar
  19. Linn, J. H. and Elliott, H. A.: 1982, Mobilization of Cu and Zn in Contaminated Soil by Nitrilotriacetic Acid,Water, Air and Soil Pollut. 37, 449–459.Google Scholar
  20. Lo and Chen: 1990,Sci. Total Environ. 90, 99–116.Google Scholar
  21. Meites, L.: 1963,Handbook of Analytical Chemistry. McGraw-Hill Book Company, New York. 1–45Google Scholar
  22. Rossin, A. C., Perry, R. and Lester, J. N.: 1982,Environ. Pollut. (Ser. A.),29, 271–302.Google Scholar
  23. Runnells, D. D. and Larson, J. L.: 1986, A Laboratory Study of Electromigration as a Possible Field Technique for the Removal of Contaminants from Ground Water,Ground Water Monitoring and Review, Summer 1986, 81–91.Google Scholar
  24. Sanning, G. E. and Lewis, N. M.: 1990,J. Air Waste Manage Assoc. 40(12), 1706–1716.Google Scholar
  25. Schauer, C. K. and Anderson, O. P.: 1987,J. Am. Chem. Soc. 198, 3646–3656.Google Scholar
  26. Shapiro, A. P., Renauld, P. and Probstein, R.: 1989, Preliminary Studies on the Removal of Chemical Species from Saturated Porous Media by Electro-Osmosis,Physicochemical Hydrodynamics 11(5/6), 785–802.Google Scholar
  27. Shindler, P. W. and Stumm, W.: 1987, ‘The Surface Chemistry of Oxides, Hydroxides, and Oxide Minerals’, in Stumm, W. (ed.)Aquatic Surface Chemistry John Wiley & Sons, New York, Chapter 4, pp. 83–110.Google Scholar
  28. Stoveland, S., Lester, J. N. and Perry, R.: 1979,Water Res. 13, 949–965.Google Scholar
  29. Vuceta, J. and Morgan, J.: 1978,Environ. Sci. Technol. 12(12), 1302–1309.Google Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Jihua Hong
    • 1
  • Peter N. Pintauro
    • 1
  1. 1.Department of Chemical EngineeringTulane UniversityNew OrleansUSA

Personalised recommendations