Fig. 12

XPS survey spectrum of thermally treated Mg/Ni/Al-LDH (a), survey spectrum of thermally treated Mg/Ni/Al-LDH after CR adsorption (b), high-resolution XPS spectra of Ni 2p (c), Mg 1s (d), Al 2p (e), O 1s (f), and N 1s (g) of thermally treated Mg/Ni/Al-LDH after CR adsorption.