Synthesis of CoFe₂O₄/Graphene Oxide-Grafted Tetraethylenepentamine for Removal of Cr (VI) from Aqueous Solution

Figure 7

(a) XPS spectra of TGOM before and after adsorption of Cr (VI) and high-resolution XPS survey of (b) O 1 s, (c) C 1 s, (d) Cr 2p, and (e) N 1 s.

(a)

(b)

(c)

(d)

(e)