Adsorption of perchlorate from aqueous solution by the calcination product of Mg/(Al-Fe) hydrotalcite-like compounds

► A cost-effective, toxic-free calcined layered double hydroxides were synthesized. ► The structures were lost during calcination but were reconstructed to perchlorate. ► Presence of Fe3+ in hydrotalcite would increase the attraction of perchlorate. ► Adsorbent could suppress the concentration of dissolved metal especially Al.