The first answer would be a size reduction, then it could be the addition of surfactants, the other addition of polymers. But I want the most efficient way. can we use some plant extracts?
You cannot increase or decrease the zeta potential of a particle - no such concept exists as the zeta potential is a holistic function of the particle AND the system it resides in. To alter the zeta potential of the system by changing the charge on the particle is easiest with pH change. Size reduction does not typically alter the zeta potential - a reduced charge is spread across the reduced surface and the zeta potential remains the same.
Another way that comes to my mind is to make the activated carbon even more activated. By applying an appropriate oxidant, you should be able to increase the surface charge by producing more surface bound -COOH and phenolic groups.
could someone please explain the concept of adsorption and activated carbon? If the zeta potential of the particle is more than -36mV or +36mV it says it has a good zeta potential. But what way it is related to adsorption.
This answer may be too late, however for those interested, read this article: Article Nitric Acid Oxidation on Carbon Dispersion and Suspension Stability
The authors used nitric acid to increase absolute zeta potential of the AC and greatly reduce the sedimentation rate of activated carbon. Note that they washed the AC after treatment till it was neutral, then I assume they resuspended the AC in water but they do not mention this, or at what concentration. They also do not mention the AC particle size or surface area, which are two important factors also.- Badges
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