Infrared Spectra of Sulfolane Adsorbed on Cation-Substituted Montmorillonites

Lorprayoon, V.

doi:10.1346/ccmn.1981.0290112

Cited by 4 publications

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“…The type of exchangeable cation in the montmorillonite film significantly affects the desorption rates of TMSO, similar to TMSOz (Lorprayoon and Condrate, 1981). After heat treatment at 150~ for one day, the IR spectra of the TMSO-treated samples of Na-, H-, and natural montmorillonites indicate lower sulfur contents and lower intensities of the TMSO bands than those of transition metal-montmorillonites (see Figure 1).…”

Section: Resultsmentioning

confidence: 91%

“…For example, a very strong band at -1292 cm -a due to the antisymmetric O=S=O stretching mode of sulfolane (TMSO0 did not increase in intensity during the treatment. Lorprayoon and Condrate (1981) noted this strong band when montmorillonites were treated with TMSO.,. The intensities of the bands for TMS-treated H-, Na-, and natural montmorillonites associated with TMS or TMSO decreased more rapidly than those of treated transition metal-montmoriltonites when the samples were heated for one day at 150~ indicating that TMS and TMSO molecules were only physically adsorbed in the former clay films.…”

Section: Resultsmentioning

confidence: 94%

“…They noted that thiophene is physically adsorbed on nontransition metal-montmorillonites and forms 7r-bonded complexes with Cu ions on Cu-montmorillonite. Recently, Lorprayoon and Condrate (1981) found from infrared spectra that the nature of sulfolane (C4HsSOe) adsorbed on various cation-substituted montmorillonites strongly depends upon the type of exchangeable cation in the interlamellar spaces along wil~h the period of exposure and the temperature of treatment. Whereas metal complexes and physically adsorbed sulfolane were both observed for transition Based on a Ph.D. thesis submitted by V. Lorprayoon to Alfred University.…”

Section: Introductionmentioning

confidence: 99%

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Infrared Spectra of Thiolane and Tetramethylene Sulfoxide Adsorbed on Montmorillonite

Lorprayoon

1983

Clays and clay miner.

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Abstract--Infrared spectra (4000-1200 cm -1) were obtained for several homoionic montmorillonite films on which tetramethylene sulfoxide (TMSO) or thiolane were adsorbed at various temperatures and for different periods of exposure. The spectra indicate that the Na-, H-, and natural montmorillonite complexes contain a physically adsorbed species, whereas transition metal-montmorillonite complexes contain both physically adsorbed and metal-complexed species in their interlamellar spaces. Apparently, thiolane adsorbed on most montmorillonites undergoes oxidation to TMSO in an air atmosphere. Consistent with the mechanism proposed earlier for aqueous solutions, the rate of sulfoxide formation increases by increasing the pH of the suspensions from which the clay films were deposited or by increasing the concentration of the water molecules in the interlamellar spaces. The infrared spectra of y-thiolactone adsorbed on Comontmorillonites suggest that sulfoxide-type molecules are formed which chelate to the Co ions in the interlamellar spaces.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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