Abstract: This study investigates the removal of ferrocyanide ions (Fe(CN)64-) from aqueous solutions using MgAl layered double (hydro)oxides(MgAl-LDH) and their roasting products (MgAl-LDO).MgAl-LDH with different concentrations of CO2-3 and Cl- intercalates were synthesized by co-precipitation, and various MgAl-LDO were prepared by roasting. The adsorption performance of LDH and LDO for Fe(CN)64-was explored.The results show that LDH exhibits a rapid adsorption rate,achieving equilibrium within 20 min. LDO has a higher adsorption capacity,reaching a maximum of 234.4 mg/g.The adsorption is effective at pH values between 7 and 12.The adsorbent also demonstrates selective adsorption of Fe(CN)64-in solutions containing high concentrations of SO2-4  and SCN-.Mechanism analysis indicates that in LDH intercalated anions,only Cl- can exchange with Fe(CN)64-,leading to adsorption and forming AlFeMg(CN)6.The adsorption of Fe(CN)64-by LDO is attributed to its memory effect with higher CO2-3 content in LDH layers corresponding to greater adsorption capacity of LDO.