Acta Periodica Technologica 2010 Issue 41, Pages: 131-139
https://doi.org/10.2298/APT1041131V
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Mg-Cu-Al layered double hydroxides based catalysts for the reduction of nitrates in aqueous solutions
Vulić Tatjana J.
Bošković Goran C.
The secondary waste and bacterial contamination in physico-chemical and
biological separation processes used today for nitrate removal from ground
water make novel catalytic technologies that convert nitrates to unharmful
gaseous nitrogen, very attractive for scientific research. The Mg-Cu-Al
layered double hydroxide (LDH) based catalysts with different Mg/Al ratio
were investigated in water denitrification reaction in the presence of
hydrogen and with solely copper as an active phase. Since LDHs have ion
exchange properties and their derived mixed oxides possess memory effect
(restoration of layered structure after thermal decomposition), their
adsorption capacity for nitrates was also measured in the same model system.
All studied samples showed nitrate removal from 23% to 62% following the
decrease in Al content, as well as the substantial adsorption capacity
ranging from 18% to 38%. These results underlie the necessity to take into
account the effects of the adsorption in all future investigations.
Keywords: Mg-Cu-Al anionic clays, nitrate removal, nitrate adsorption, water denitrification
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