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The evolution of textural properties of Na/Ca-bentonite following hydrothermal treatment at 80 and 300ºC in the presence of Fe and/or Fe oxides

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Abstract:

The evolution of textural properties of Na/Ca-bentonite from W yoming (MX-80) was studied by adsorption of nitrogen, water vapour, and ethylene glycol monoethyl ether. Clay suspensions were heated at 80 and 300ºC for up to 9 months in the absence of or in the presence of Fe and/or Fe oxides. The treatment without Fe did not change the textural properties of the samples significantly. The treatment at 80ºC in the presence of Fe resulted in a considerable increase in the external surface areas of the samples. The total and external surface areas and swelling capacities of the samples decreased following the treatment at 300ºC in the presence of Fe and Fe oxides. In the case of larger additions of Fe, the treatment at 300ºC resulted in a considerable decrease in the total and external surface areas and swelling capacity of the sample and in the formation of a network of large-size pores, in which all the pores were connected.

Keywords: BENTONITE; EGME ADSORPTION; MX-80; NITROGEN ADSORPTION; TEXTURAL PROPERTIES; WATER VAPOUR ADSORPTION

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/0009855033820090

Publication date: June 1, 2003

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