Efficient Removal of Methyl Orange and Heavy Metal Ion from Aqueous Solution by NiFe-Cl-Layered Double Hydroxide

NiFe-layered double hydroxides (LDHs) with four different interlayer anions (NiFe-X-LDH, X = Cl−, NO3−, SO42−, and CO32−) were synthesized by a coprecipitation method. Their adsorption performance for methyl orange (MO) was first studied. It is found that the interlayer anions strongly affect the adsorption capacity, and adsorption amount of NiFe-X-LDH follows the order CO32−