Cr(VI) Removal from Aqueous by Adsorption on Amine-Functionalized Mesoporous Silica Prepared from Silica Fume

Figure 3

XPS spectra of NH₂-MCM-41 and Cr–NH₂-MCM-41. (a) Over all spectra of NH₂-MCM-41; (b) N 1s spectra of NH₂-MCM-41 before adsorption; (c) overall spectra of Cr–NH₂-MCM-41; (d) Cr 2p spectra of Cr–NH₂-MCM-41; (e) N 1s spectra of NH₂-MCM-41 after adsorption.

(a)

(b)

(c)

(d)

(e)