Chapter 4
assuming НСОз’ ion adsorption is closer to the experiment data than the curve
without assuming НСОз’ ion adsorption.
From zeta potential result, anions SO42’ or HCO3^ can adsorb on positively
charged surface sites and make kaolinite zeta potential more negative.
4.3.5.3. Adsorption effect of cations Ca2+ and Mg2+
Synthetic brine contains cations Ca2+ and Mg2+. The negatively charged Al/
Si sites -AO’ can adsorb Ca/ Mg ions and become positively charged.
C(CaCl2) (M)
Figure 4.25 Kaolinite zeta potential in 0.05 M NaCI brine adding CaCI2 at pH 6.5
In order to study the effect of Ca/ Mg ions, zeta potentials of kaolinite in 0.05
133
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