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Chapter 4

σ₀=e([AOH÷]-[AO]-[B])

[4.36]

Here КНСОз is the adsorption equilibrium constant.

* Experiment data
-----Fitted curve with bicarbonate adsorption
-------Fitted curve without bicarbonate adsorption

-20
E

-60

.701—I--------------∣--------------∣--------------ɪ--------------1--------------1--------------1—

0.02 0.04 0.06 0.08 0.1 0.12 0.14

C(NaHCO₃) (M)

Figure 4.24 Kaolinite zeta potential adding NaHCO3 in de-ionized water at pH 8.3

Figure 4.24 shows zeta potential of kaolinite as the function of NaHCO₃concentration at bulk pH 8.3. With the increase concentration of NaHCO₃, zeta
potential becomes less negative. This is due to the increase of ionic strength. The
dashed curve shows the fitted results assuming no HCO₃^ ion adsorption. The
deviation of experiment data and fitted result indicates the effect of HCO₃' ion
adsorption. The solid curve shows the fitted results assuming HCO₃' ion
adsorption and the adsorption constant Кнсоз is 0.018 m³∕mol. The fitted curve

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