Figure 6. FTIR spectra of the structural OH-bending region of 1-naphthol-sorbed whole K-SWy-2 vs. carbonate-free K-SWy-2. A reduction in intensity of the AlFe³⁺OH-bending mode of whole K-SWy-2 was observed relative to the intensity of this band in carbonate-free clay while no changes in the intensities of the AlAlOH and AlMgOH bands were noted.