Calculation of the point of zero charge of metal oxides between 0 and 350°C

Details Calculation of the point of zero charge of metal oxides between 0 and 350°C Calculation of the point of zero charge of metal oxides between 0 and 350°C

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.2845s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 13, pp.2845-2851

Physics

2

Scientific paper

Using the available temperature dependence data for rutile (TiO 2 ), magnetite (Fe 3 O 4 ), hematite ( -Fe 2 O 3 ), -Al 2 O 3 , and Ni(OH) 2 , the pH pzc for these phases has been calculated up to 350°C. The calculations are based on the Balanced Like-Charge extrapolation technique. It is predicted that the pH pzc for oxides shift to lower pH between 0 and 200 to 300°C. At temperatures between 200 and 300°C, this trend is reversed for all oxides except -Al 2 O 3 . Because independent studies on the same mineral phase are not in full agreement and data at high temperature ( T > 95° C ) are not available, the calculated values above 150°C serve only as a rough guide to how pH pzc are expected to change as a function of temperature.

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