Dear Nabeel,
In colloids, zeta potential is the electric potential difference across the ionic layer around a charged colloid ion. Put another way, it's the potential in the interface double layer at the slipping plane. Typically, the higher the zeta-potential, the more stable the colloid. Zeta potential that are less negative than -15 mV typically represents the beginnings of agglomeration of particles. When the zeta-potential equals zero, the colloid will precipitate into a solid. Since the physical properties of suspensions and colloids largely depend on the properties of the particle-liquid interface, knowing the zeta potential has practical applications among which we can cite : Destroy undesirable colloidal dispersions during water and sewage treatment, Reduce cost of additives by calculating the minimum amount needed to achieve a desired effect, such as amount of flocculant added to water during water treatment, Characterize the properties of clay-water systems, and many others…
With my best regards
Prof. Bachir ACHOUR
The stability of coagulants and possible reaction between the pollutant and coagulant matters are analyzed with the help of zeta potential. By changing the solution pH, zeta potential of liquid and coagulant also varied.
Dear Nabeel,
In colloids, zeta potential is the electric potential difference across the ionic layer around a charged colloid ion. Put another way, it's the potential in the interface double layer at the slipping plane. Typically, the higher the zeta-potential, the more stable the colloid. Zeta potential that are less negative than -15 mV typically represents the beginnings of agglomeration of particles. When the zeta-potential equals zero, the colloid will precipitate into a solid. Since the physical properties of suspensions and colloids largely depend on the properties of the particle-liquid interface, knowing the zeta potential has practical applications among which we can cite : Destroy undesirable colloidal dispersions during water and sewage treatment, Reduce cost of additives by calculating the minimum amount needed to achieve a desired effect, such as amount of flocculant added to water during water treatment, Characterize the properties of clay-water systems, and many others…
With my best regards
Prof. Bachir ACHOUR
Thanks a lot dear Professors Bachir and Sakthi. Your answers were perfectly enough.
The zeta potential is a parameter that gives direct information on the charge sign and some information on the charge (potential) magnitude of the particles. When the stability agains flocculation is governed by the charge (potential) of the particles then a zeta potential close to zero will lea to flocculation. The zeta potential is affected by ion adsorption; effective variations in zeta potential can be achived by pH changes and changes in background electrolyte concentration. Specifically di- and tri-valent ions also affect the zeta potential strongly.
Article Measurement and interpretation of electrokinetic phenomena
Dear Raju,
Thank you very much for your appreciation.
With my best regards
Prof. Bachir ACHOUR
The zeta potential is a key indicator of the stability of colloidal dispersions.
The question specifically asks about water treatment. The usual guide that |zeta|
to be a bit pedantic 'raw water' as well as purified water has no zeta potential, dispersed particles have.
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