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Immobilization of Pb in a Geopolymer Matrix
Author(s) -
Perera Dan S.,
Aly Zaynab,
Vance Eric R.,
Mizumo Masahiro
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00438.x
Subject(s) - geopolymer , potassium silicate , potassium hydroxide , potassium nitrate , silicate , potassium , mixing (physics) , matrix (chemical analysis) , phase (matter) , materials science , nitrate , nuclear chemistry , chemistry , inorganic chemistry , hydroxide , chemical engineering , mineralogy , metallurgy , fly ash , composite material , physics , organic chemistry , quantum mechanics , engineering
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.