Figure 7. FTIR spectra of the structural OH-stretching region of 1-naphthol-sorbed whole clay and carbonate-free K-SWy-2 reflecting the overall contribution of AlAlOH, AlFe⁺³OH and AlMgOH bands. The (OH) band of the whole clay shows a lower intensity in the lower-energy portion (3595 to 3572 cm^–1) of this spectrum representing AlFe³⁺OH and FeFeOH bands.