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Time-dependent changes of adsorption and wetting properties of pillared montmorillonites

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Abstract:

The changes of adsorption properties of uncalcined Al-pillared montmorillonite were studied. A soda-activated bentonite from Slovakia was reacted with polymeric hydroxoaluminium salt solutions. During storage in air at room temperature for three years, the basal spacing decreased by 0.15 0.2 nm; the specific surface area was reduced by 80% and the total pore volume by 40-60%. Adsorption experiments from ethanol-cyclohexane mixtures revealed the decreasing adsorption capacity and the increasing hydrophobicity. The changing surface character was also evident in the decrease in enthalpy of immersion in ethanol from 65.3 J/g to 8.3 J/g (sample B) and from 37.8 J/g to 5.2 J/g (sample C). The alteration probably arises from gradual formation of gibbsite-like interlayers and the redistribution of charges.

Keywords: ADSORPTION; ENTHALPY OF IMMERSION; HYDROPHOBICITY; PILLARED MONTMORILLONITES

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/000985500547214

Publication date: December 1, 2000

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minsoc/cm/2000/00000035/00000005/art00003
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