The name is absent



Chapter 4

kaolinite as the function of Na2SO4 concentration in 0.05 M NaCI brine at pH 6.5.

The adsorption constant ∕<s04 is 0.195 m3∕mol.

C(Na2SO4) (M)

x103

Figure 4.23 Kaolinite zeta potential in 0.05 M NaCI brine adding Na2SO4 at pH 6.5

In order to study the effect of bicarbonate, zeta potentials of kaolinite with
different NaHCO3 in de-ionized water at pH 8.3 were measured. In NaHCO3
solution, positively charged sites -AOH2+ can adsorb HCO3^ ion and become
neutral sites -AOH2HCO3.

-AOH2 +HCO3 f≡ -AOH2HCO3                                  [4.34]

κ _ [AOH2HCO3]        [AOH2HCO3]

hc°3 [AOH2]α∕HCO3) [AQH2 ]αz, (HCO3 )exp(-)

131



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