Calorimetry of heterogeneous systems: H+ binding to TiO2 in NaCl
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Abstract
A simultaneous calorimetric and potentiometric technique has been developed for measuring the thermodynamics of proton binding to mineral oxides in the presence of a supporting electrolyte. Modifications made to a commercial titration calorimeter to add a combination pH electrode and maintain an inert atmosphere in the calorimeter reaction vessel are described. A procedure to calibrate potentiometric measurements in heterogeneous systems to correct for the suspension effect on pH is given.
The enthalpy change for proton dissociation from TiO2 in aqueous suspension as a function of pH is reported for 0.01, 0.1, and 0.5 M NaCl. The enthalpy change for proton dissociation is endothermic, ranging from 10.5 ± 3.8 to 45.0 ± 3.8 kJ mol−1 over the pH range from 4 to 10.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Calorimetry of heterogeneous systems: H+ binding to TiO2 in NaCl |
| Series title | Thermochimica Acta |
| DOI | 10.1016/0040-6031(89)87125-4 |
| Volume | 154 |
| Issue | 1 |
| Year Published | 1989 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 15 p. |
| First page | 129 |
| Last page | 143 |
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