i got a zeta potential of -27mv with zeta deviation of 5.09mv and conductiivity of 0.014mS/cm keeping water as the Dispersant Medium, Dispersant RI of 1.3 and Viscosity (cP) of 0.89.
Zeta potential is a holistic property dependent on the external situation (pH, polyvalent ions etc). It cannot be defined for a single material alone or as a powder, so your question has no meaning. Further details as to the aqueous medium surrounding the material are essential.
You need conductivity in the continuous phase for a zeta potential measurement. What is the pH and the approximate (primary and aggregated) size of the carbon. What is the intended application as this will govern 'fit for purpose'?
Your question can only be answered when you explain what function you want the activated carbon to fulfill: "Excellent" in doing what? For instance, for catalysis, I doubt that the zeta potential is relevant at all.
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