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Leaching Behavior of Edta In A Silica Sol-Gel Matrix

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 the sol-gel process for the potential application as a filter for heavy metal ions in wastewater. The behavior of the organic molecule in the matrix was studied by investigating the percentage of EDTA leached out with a variation in the timing of addition of the EDTA molecule into the starting silica gel solution. Leach tests using water as the medium were performed for 2, 12 and 24 hours in order to determine the amount of EDTA trapped in the pores or in the matrix. A minimum amount of EDTA leached from the gels was detected in the samples to which EDTA was added 4 hours after initial hydrolysis of TEOS. This result was correlated to having a greater percentage of pore volume in the range of 15–20 Å, which was further substantiated with density measurements. The physical changes in the silica matrix altering the pore volume distribution were attributed to the addition of the water into which the EDTA molecule was initially dissolved.

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

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