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01-07-2007 | Issue 14/2007

Journal of Materials Science 14/2007

Comparison of the fluoride, arsenate and nitrate anions water depollution potential of a calcined quintinite, a layered double hydroxide compound

Journal:
Journal of Materials Science > Issue 14/2007
Authors:
Fabian Delorme, Alain Seron, Anne Gautier, Catherine Crouzet

Abstract

The potential for removing anionic pollutants such as F, HAsO 4 2− , and NO 3 from water by mixed oxides issued from the moderate thermal treatment of quintinite (Mg4Al2 LDH) has been studied. This compound shows good trapping properties for F and HAsO 4 2− , and a low potential for NO 3 , due to the competition with OH. The competition between these three anions and CO 3 2− has been envisaged and shows that CO 3 2− is able to easily replace F and NO 3 , making the mixed oxides issued from MgAl LDH an inappropriate trap for F and NO 3 . However, only small amounts of arsenic are released after the CO 3 2− introduction in water. Moreover, arsenates are able to replace carbonates even at lower concentrations. This means that HAsO 4 2− anions present a stronger affinity than CO 3 2− for the LDH structure. This makes mixed oxides issued from MgAl LDH very promising materials for the removal of arsenic in polluted waters.

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