LDHMg Al Cl LDH was synthesized under a nitrogen at room temperature using the coprecipitation method, similar to the method previously described [14,16]. Briefly, MgCl2·6H2O(3 mmol) and AlCl3·6H2O (1 mmol) were dissolved in 10 mL of deionized water and quickly poured into the 40 mL NaOH solution (6 mmol) with vigorous stirring under a nitrogen at room temperature. Then the solution containing the slurry was stirred for 30 min and aged for 1 h and the resulting slurry was collected via centrifugation (5 min, 4500 min−1). The precipitate was washed with deionized water twice and suspended manually in 50 mL of deionized water. Then the solution was treated hydrother mally at 100◦C for 24 h to obtain homogen size. LDH crystallites were obtained via centrifugation and dried under a vacuum [18].The characterization or identification of MA, LDH and MA–LDH were analyzed by FTIR. The zeta potential (surface charge) and mean particle diameter of LDH were determined with ZetasizerNanoseries (Malvern Instruments, UK) in deionized water at 25◦C.