Kinetic dissolution of phosphate glasses containing toxic heavy metals

Abdelouahab El Hadrami (1) , Mohamed Mesnaoui (1) , Mohamed Maazaz (1) , Jean-Jacques Videau (2)

1 Laboratoire de Chimie du Solide Minéral
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The dissolution kinetics of a series of phosphate glasses with the compositions 50P2O5–15ZnO–(35−x)PbO–xCdO (x=20 and 35) and (100−y)[50P2O5–15ZnO–15PbO–20CdO]–yAl2O3 (y=6 and 8) have been studied in aqueous solution. The dissolution process of aluminium free metaphosphate glasses is interpreted as hydration of glass surface with a congruent dissolution for x=35 and controlled by both mechanisms with incongruent dissolution for x=20. The addition of Al2O3 in metaphosphate glass (x=20) considerably improves the corrosion resistance...

Mots clés: Phosphate glasses; Heavy metal; Toxicity; Kinetic dissolution

Domaines: Matériaux

Abdelouahab El Hadrami, Mohamed Mesnaoui, Mohamed Maazaz, Jean-Jacques Videau. Kinetic dissolution of phosphate glasses containing toxic heavy metals. Journal of Non-Crystalline Solids, 2003, 331 (1-3), pp.228-239. ⟨10.1016/j.jnoncrysol.2003.08.066⟩. ⟨hal-00170369⟩