Abstract
The ζ-potential of synthetic chrysotile asbestos in aqueous alkali halide MX (M = Li, Na, K, Cs; X = F, Cl, Br, I) solutions was measured by a microelectrophoretic method. The ζ-potential of chrysotile in water was a minimum at pH 6.3 and its isoelectric point (IEP) was 12.3. This variation of ζ-potential with pH is interpreted as due to the formation of a complex oxide composed of silica and brucite due to Mg 2+ -leaching from outer brucite surfaces. The positive ζ values at pH 6.3 more than 8 increased with salt concentration. The ζ-potential increased with increase in ionic radius of cations with decrease in ionic radius of anions. This ζ-potential increase is interpreted as a specific effect of cations on the outer surface. The titration of chrysotile in aqueous solution gave the point of zero charge (PZC) of chrysotile, 10.5. The difference between the PZC the IEP may arise from the tubular structure of chrysotile, i.e., the existence of both acidic inner (silica) basic outer (brucite) surfaces.
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