Mechanochemical route for synthesizing nitrate form of layered double hydroxide

摘要

This paper introduces a mechanochemical process for synthesizing a nitrate compound,Mg-Al-(NO3)(Mg:Al=3:l),which is a layered double hydroxide(LDH)from three kinds of starting materials,Mg(OH)2,Al(OH)3 and Mg(NO3)2.6H2O.The operation was attempted by one-and two-step milling operations,and the former is to grind the three kinds of samples simultaneously,while the latter is to mill two kinds,Mg(OH)2 and Al(OH)3,followed by further milling with Mg(NO3)2.6H2O.Characterizations by XRD,FT-IR,and TG-DTA indicate that the latter step operation is superior to the former one in terms of the formation of the target material,nitrate form of LDH.This form could be taken as a potential candidate for slow-release fertilizer,where the release of the nitrate from the synthesized LDH has been held back due to the intercalation into the LDH structure.