Abstract
Electrokinetic properties of expanded and unexpanded perlite samples have been investigated using the microelectrophoresis technique. Perlite samples yield practically no isoelectric point in the pH range of 3 to 11. Both of the perlite samples remain negatively charged in the pH range studied. The expanded perlite has a more negatively charged surface than unexpanded perlite. NaCl, KNO3, NaNO3, Na2CO3, and Na2SO4are indifferent electrolytes for perlite whereas AlCl3and CaCl2change the interface charge from negative to positive. Acid-activation has no significant effect on the zeta potential of perlite.
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