Effect of Concentration and Duration of Acid Treatment on Water Adsorption and Titration Behaviour of Smectite, Illite and Kaolin
Three clay minerals: bentonite, illite and kaolin were treated with acid at different concentration and time. The changes of surface areas, water vapor adsorption energies, variable charge and apparent surface dissociation constants were observed depending on the kind of the mineral and acidification conditions. After acid treatment, the surface area increased for kaolin and illite, but decreased for smectite and the opposite tendency occured for the adsorption energy. For all minerals the amount of variable charge increased and the apparent surface dissociation constant decreased indicating the decrease of the surface acidity strength.
KeywordsClay Mineral Acid Treatment Water Adsorption Adsorption Energy Titration Curve
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- 6.Jozefaciuk G. and Jae-Sung Shin, 1996a: Water vapor adsorption on soils. I. Surface areas and adsorption energies as calculated by the BET and a new Aranovich theories. J. Korean Soc.Soil Sci. Fertilizer, 29/2, 86–91Google Scholar
- 7.Józefaciuk G. and Jae-Sung Shin, 1996b: A modified back-titration method to measure soil titration curves minimizing exchange acidity and dilution effects. J. Korean Soc.Soil Sci. Fertilizer, 29/4, 321–327Google Scholar
- 8.Józefaciuk G. and Jae-Sung Shin, 1996c: Distribution of apparent surface dissociation constants of some Korean soils as determined from back titration curves. J. Korean Soc.Soil Sci. Fertilizer, 29/2, 86–91Google Scholar
- 12.Nilsson I., 1983. Effects on soil chemistry as a consequence of proton input. In: B. Ulrich and J. Pankrath (eds.), Effect of Accumulation of Air Pollutants in Forest Ecosystems, D. Reidel Publ. Comp. 105-111;.Google Scholar
- 13.Parks G.A., 1967. Aqueous surface chemistry of oxides and complex oxide minerals. Isoelectric points and zero point of charge. In: Advances in Chemistry Series. R.F. Gould (ed.), 67, 121-160;.Google Scholar