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OXIDATION OF 1-NAPHTHOL COUPLED TO REDUCTION OF STRUCTURAL Fe³⁺ IN SMECTITE

¹ Department of Crop and Soil Sciences, and Environmental Science and Policy Program, Michigan State University, East Lansing, Michigan 48824, USA
² Crop, Soil and Environmental Sciences, Lilly Hall of Life Sciences, Purdue University, West Lafayette, Indiana 47907, USA

View larger version (18K): [in a new window]   Figure 1. Voigt function fittings and residue at the three OH-deformation bands at 916, 883 and 847 cm–1 with a linear baseline correction between 950 and 820 cm–1.

View larger version (28K): [in a new window]   Figure 2. Disappearance of 1-naphthol from aqueous solution in the suspensions of (a) whole clay containing carbonates, (b) carbonate-free clay, (c) carbonate-free clay amended with calcite, and (d) calcite.

View larger version (18K): [in a new window]   Figure 3. XRD patterns of oriented, air-dried K-SWy-2 films with and without 1-naphthol sorption: (a) whole clay and (b) carbonate-free clay.

View larger version (27K): [in a new window]   Figure 4. FTIR spectra of 1-naphthol sorbed to the whole SWy-2 clay and carbonate-free SWy-2 in the 4000 to 400 cm–1 region (the two spectra are overlapped).

View larger version (19K): [in a new window]   Figure 5. An expanded region in the 2200 to 1350 cm–1 of the FTIR spectra of 1-naphthol-sorbed whole K-SWy-2 (dotted lines) vs. carbonate-free K-SWy-2 (solid lines). Increased band intensity present as a broad spectral component under the 1701, 1636 and 1531 cm–1 bands is attributed to the transformation product(s) of 1-naphthol.

View larger version (19K): [in a new window]   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.

View larger version (18K): [in a new window]   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.

View larger version (27K): [in a new window]   Figure 8. Non-linear least-squares peak fitting of structural OH-stretching band.