Silica surface chemistry at elevated temperatures

Details Silica surface chemistry at elevated temperatures Silica surface chemistry at elevated temperatures

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2941b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 7, pp.2941-2946

Physics

6

Scientific paper

Potentiometric titrations of SiO 2 surfaces at 25 and 60°C indicate that SiO 2 surface chemistry is sensitive to temperature. The number of negatively charged surface sites becomes more pH dependent at T > 25° C . Metal binding constants for Cd ++ and Pb ++ , calculated with a constant capacitance model, increase by between 0.3 and 2 orders of magnitude between 25°C and 60°C. This parallels temperature-dependent changes in the association constants for the respective metal hydrolysis constants.

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