Storage of toxic heavy metals in phosphate glasses: physical and water durability properties

Phosphate glasses of composition (100− y)[50 P 2O 5–15 ZnO–(35− x) PbO– x CdO]– yAl 2O 3 have been prepared and studied. In the alumina-free glasses ( y=0), the effect of CdO substitution for PbO involves a strengthening of the glass network with a maximum of the aqueous durability for x values clos...

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Bibliographic Details
Published in:Materials letters 2002, Vol.57 (4), p.894-898
Main Authors: El Hadrami, A, Aouad, H, Mesnaoui, M, Maazaz, A, Videau, J.J
Format: Article
Language:English
Subjects:
Applied sciences
Chemical Sciences
Exact sciences and technology
General treatment and storage processes
Heavy toxic metals
Material chemistry
Phosphate glasses
Physical properties
Pollution
Wastes
Water durability
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Summary:Phosphate glasses of composition (100− y)[50 P 2O 5–15 ZnO–(35− x) PbO– x CdO]– yAl 2O 3 have been prepared and studied. In the alumina-free glasses ( y=0), the effect of CdO substitution for PbO involves a strengthening of the glass network with a maximum of the aqueous durability for x values close to 20. For x=20, the addition of Al 2O 3 in the composition range 0≤ y≤8 leads to a progressive increase of the phosphate network reticulation. For y>4, an unexpected change in the properties is observed, which probably results from a cationic rearrangement in the glass structure. For y=8, the chemical durability is equivalent to that of window glass. Such glasses are potential candidates for the storage of toxic heavy metals.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(02)00891-1