On the use of Nano structured Layered Double Hydroxides as Nano filters in the removal of Fe2+ and Ca2+ ions from oil wells.

Four new metal-aluminum layered double hydroxides (LDHs): Mg-Al(OH)2PO4 1, Mg-Al(OH)2PO4PF6 2, Ca-Al(OH)2SO4 , 3 and Ca-Al(OH)2PO4PF6 4, were prepared by coprecipitation method followed by mild hydrothermal processing at 60 o C. Mg2+ and Ca2+ in solution with Al3+ was titrated with NaOH over 3-5 h to yield Mg-Al and Ca-Al layered.