Figure 4.
The core level XPS spectra of (a and b) Mg 1s, Mg 2p, (c and d) Al 2p, (e and f) Si 2p, (g and h) O 1s, (i and j) C 1s, (k) S 2p, and (l) N 1s of the MgAl-LDH@SiO2 and MgAl-LDH@SiO2 + AG-40.
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