Estimation of the point of zero charge of simple oxides by mass titration
A method is proposed to estimate the point of zero charge (pzc) of pure compounds which can be described accurately by the surface ionization model of amphoteric oxides. It is demonstrated that under the limiting conditions of “infinite” mass/volume ratio, the pH of the system will approach pH ∞ = 1...
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| Published in | Journal of colloid and interface science Vol. 130; no. 1; pp. 157 - 164 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Inc
1989
|
| Online Access | Get full text |
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| Summary: | A method is proposed to estimate the point of zero charge (pzc) of pure compounds which can be described accurately by the surface ionization model of amphoteric oxides. It is demonstrated that under the limiting conditions of “infinite” mass/volume ratio, the pH of the system will approach
pH
∞ =
1
2
(
pK
1 +
pK
2)
pzc
. Experimental values of the pH of the oxides of titanium, aluminum, a silicon suspended in a closed aqueous system exhibited the existence of a constant pH at high mass fractions. This limiting pH is found to be a reasonable estimate for the point of zero charge of each oxide. |
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| Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
| ISSN: | 0021-9797 1095-7103 |
| DOI: | 10.1016/0021-9797(89)90086-6 |