Simultaneous removal of Cu(II) and Cr(VI) by Mg-Al-Cl layered double hydroxide and mechanism insight

Cl− intercalated Mg-Al layered double hydroxide was demonstrated to be an efficient absorbent for simultaneous removal of Cu(II) and Cr(VI) in different concentrations through: (i) anion exchange of Cr(VI) with Cl− in the interlayer of LDH, (ii) formation of Cu2Cl(OH)3 precipitation, (iii) adsorption of Cr(VI) by Cu2Cl(OH)3, and (iv) isomorphic substitution of Mg2+ with Cu2+.248