*2.5. Zn-Al LDH*

The synthesis of Zn-Al LDH was conducted with Zn5(CO3)2(OH)6 (Sigma-Aldridge, St. Louis, MO, USA). This was milled at a 1:1 (Zn:Al) metal ratio with Al(OH)3 (Hindalco, Belgaum, India). The sample was further referred to as S5 (30.69 g Zn5(CO3)2(OH)6, 21.77 g Al(OH)3) [18].
