Intercalation of Naphthoic Acid into Zn/Al Layered Double Hydroxide

Zn/Al Layered Double Hydroxide (Zn/Al LDH) consists of positively charged metal hydroxide sheets with anions located between the layers to compensate charges. By the reaction of carbonate Zn/Al LDH (CO3(2-)) with 2-naphthoic acid, two intercalation compounds were obtained indicating the occurrence of ion exchange reaction. Interlayer spacing increased from 0.76 nm to 1.9 nm and 2.4 nm, respectively by the intercalation reaction. Upon the treatment of two intercalation compounds in supercritical CO2, layer structure of the intercalation compound with 2.4 nm disappeared although no change occurred in the intercalation compound with 1.9 nm.