Synthesis Of Several 2:1 Type Of Mg₂Al Hydrotalcite And The Pillared Change Of Layer Region

Compared with several water-heat treatment synthesis methods to search elements of influenting quality of hydrotalcite optimum synthesis conditions such as salt basic concentration ,salt base ratio, mix methods ,mix velocity, precipitate temperature and N₂ protect, stir time and intensity, aging time and aging temperature ,and so on . Use method by self-preparation "room temperature instantaneous copercipitation method" to synthesize [Mg₄Al₂(OH)₁₂]CO₃·3.75H₂O,which have the largest layer electric change nearly (0.040 e/nm²) and anion exchange capacity(2.0 mol/mol).Attempt to prepare large pillared hydrotalcite with new synthesis method. For example ,"stew to decarbon " , "soak to replace", "change acidity to decarbon", "heat exchange" and "anti-titration" , " promote exchange by microwave". Meanwhile , compared the exchange result of every kind of method to select the best.