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Leaching Behavior of Edta In A Silica Sol-GelMatrix

Published online by Cambridge University Press:  21 February 2011

Kris S. Oka  and
J.D. Mackenzie
Kris S. Oka
Affiliation:
University of California, Los Angeles, Department of Materials Science and Engineering,5732 Boelter Hall, 405 Hilgard Avenue, Los Angeles, CA 90024
J.D. Mackenzie
Affiliation:
University of California, Los Angeles, Department of Materials Science and Engineering,5732 Boelter Hall, 405 Hilgard Avenue, Los Angeles, CA 90024
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Abstract

Ethylene diamine tetra-acetic acid (EDTA) doped silica gels were made by thesol-gel process for the potential application as a filter for heavy metalions in wastewater. The behavior of the organic molecule in the matrix wasstudied by investigating the percentage of EDTA leached out with a variationin the timing of addition of the EDTA molecule into the starting silica gelsolution. Leach tests using water as the medium were performed for 2, 12 and24 hours in order to determine the amount of EDTA trapped in the pores or inthe matrix. A minimum amount of EDTA leached from the gels was detected inthe samples to which EDTA was added 4 hours after initial hydrolysis ofTEOS. This result was correlated to having a greater percentage of porevolume in the range of 15–20 Å, which was further substantiated with densitymeasurements. The physical changes in the silica matrix altering the porevolume distribution were attributed to the addition of the water into whichthe EDTA molecule was initially dissolved.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 323
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

1 Li, C., Tseng, J., Monta, K., Lechner, C., Hu, Y. and Mackenzie, J.D., in Ormosils as Matrices in Inorganic-organic Nanocomposites for Various Applications, edited by Mackenzie, J.D. (SPIE Proc. 1758, San Diego, CA 1992) pp. 410-419.Google Scholar
2 Lev, O., Kuyavskaya, B., Gigozin, I., Ottolenghi, M. and Avnir, D., Fresenius J. Anal. Chem. 343 (1992).Google Scholar
3 Ogino, H. and Shimura, M., Advances in Inorganic and Bioinorganic Mechanisms. Vol. 4 (Academic Press Inc., London, 1986), p 107.Google Scholar
4 Skoog, D.A. and West, D. M., Analytical Chemistry. 2nd ed. (Holt, Rinehart and Winston, Inc., New York, 1965), p. 296.Google Scholar