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Immobilization of Pb in a Geopolymer Matrix

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Abstract:

In a geopolymer matrix prepared by mixing a metakaolinite precursor with a solution of potassium hydroxide and silicate, 1 wt% Pb as the nitrate has been immobilized. Under the United States Environmental Protection Agency test protocol the Pb release was less than 5 ppm, the acceptable limit for landfills in the U.S.A. Electron microscopy showed Pb was present in the major amorphous phase and a minor (∼1 vol%) Ca-rich potassium silicate phase. Heating cured samples to several hundred degrees Centigrade was not significantly advantageous for immobilizing Pb.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2005.00438.x

Affiliations: Australian Nuclear Science and Technology Organisation, Menai NSW 2234, Australia

Publication date: September 1, 2005

bsc/jace/2005/00000088/00000009/art00042
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