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Chapter 4

decrease; the fraction of negatively charged sites -AO' will increase. At pH 8 - 9,
almost all silica sites are negatively charged; for alumina site, the fraction of
positively charged site is higher than negatively charged site.

Table 4.8 Kaolinite surface site densities and dissociation constants

Reaction

K (mol∕m3)

N ( W8 mol∕m2)

-aioh; ≠-AlOH+H+

2.86×10^8

18.5

-AlOH -AlO+ H+

3.33×10'1°

-SiOH^ f≡-SiOH +H+

5.03×10^4

4.83

-SiOH f≡-SiO + H+

5.16×10^6

Inert sites

21.6

Figure 4.19 Silica sites fraction in kaolinite at different bulk pH in 0.05 M NaCI

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