The Improvement of Natural Thai Bentonite Modified with Cationic Surfactants on Hexavalent Chromium Adsorption from an Aqueous Solution

Figure 5

EXAFS spectra and Fourier transform EXAFS of powder references and powder samples included the (a) Cr(III) reference, (b) Cr(VI) reference, (c) NTB+Cr(III), (d) 1HDTMA+Cr(III), (e) 1CPC+Cr(III), (f) 1HDTMA+Cr(VI), and (g) 1CPC+Cr(VI). The black lines are raw data, and the color lines are fitted data.

(a)

(b)