Halloysite@polydopamine/ZIF-8 Nanocomposites for Efficient Removal of Heavy Metal Ions

Figure 14

XPS spectra of HNTs@PDA/ZIF-8 after adsorption: (a) N 1s of Cu-loaded, (b) N 1s of Cd-loaded, (c) N 1s of Pb-loaded, (d) N 1s of Ni-loaded, and (e) N 1s of HNTs@PDA/ZIF-8.

(a)

(b)

(c)

(d)

(e)