Utilization of Mg2Al–layered double hydroxide as an effective sequestrator to trap Cu(II) ions from aqueous solution impacted by water quality parameters

Abstract

Recently, Mg2Al–layered double hydroxide (Mg2Al–LDH) has been extensively studied as promising candidates to trap metal ions due to their high complexation and adsorption capacity. Herein, Mg2Al–LDH was utilized as an effectiveness sequestrator to trap Cu(II) ions from aqueous solution by an adsorption process using batch technique under ambient conditions. The results showed that Cu(II) adsorption on Mg2Al–LDH increases with pH increasing and maintains a high level at pH>7.0. The adsorption of Cu(II) was obviously affected by ionic strength at low pH, which was not dependent on ionic strength at high pH. The presence of HA or FA promotes the adsorption of Cu(II) on Mg2Al–LDH at low pH values, while reduces the adsorption of Cu(II) at high pH values. The adsorption isotherms of Cu(II) on Mg2Al–LDH at three different temperatures were simulated by the Langmuir, Freundlich, and Dubinin-Radushkevitch (D–R) models very well. The thermodynamic parameters were determined from the temperature-dependent adsorption, and the results showed that Cu(II) adsorption on Mg2Al–LDH was exothermic and the process was favored at high temperature. The results suggest that Mg2Al–LDH is suitable as a sorbent material for the recovery and attenuation of Cu(II)-polluted wastewater.