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The characterization of four types of LDH with different ion elements. A) TEM images of MgAl–Cl, MgFe–Cl, MgAl–NO3 and MgFe–NO3 LDH. Scale bar = 100 nm. B) XPS spectrum of elemental composition in MgAl–Cl, MgFe–Cl, MgAl–NO3 and MgFe–NO3 LDH. C) XRD analysis of MgAl–Cl, MgFe–Cl, MgAl–NO3 and MgFe–NO3 LDH. D) FTIR analysis of MgAl–Cl, MgFe–Cl, MgAl–NO3 and MgFe–NO3 LDH.
