Regulation of Properties of Dispersions for Their Electrokinetic Treatment

For efficient processing of disperse systems based on the use of external electric fields the highest possible velocities of electrophoresis and electroosmosis for a particular system should be ensured. In case of dispersion, which includes a clay component, the main factor that allows adjusting of its electrokinetic properties is pH of equilibrium solution. In this regard, in present work the kinetics of changes in pH of the pore solution with the introduction of acidic and alkaline solutions (NaOH and HCl) is studied. It is found that at given moisture over a wide concentration range of used electrolyte concentrations the equilibrium pH of the pore solution is achieved after 24 hours. The carried out investigations of electrophoresis velocities and the electrokinetic potentials calculated on their basis showed that the maximum value of the potential is achieved at 8  pH  12. The maximum values of stationary electroosmosis velocities correspond to the same range of pH values, however, due to the shape of the dispersion pores and external hydrodynamic resistance of the experimental cell their values are 20–30 % lower than estimated ones.

Publication year: 
2014
Issue: 
3
УДК: 
541.18:542.8
С. 100–106., Іл. 6. Бібліогр.: 19 назв.
References: 

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References [transliteration]: 

1. J. Virkutyte at al., “Electrokinetic soil remediation – critical overview”, Sci. Total Environ., vol. 289, no. 1–3, pp. 97–121, 2002.
2. Z. Li at al., “Electroremediation: removal of heavy metals from soils by using cation selective membrane”, Environ. Sci. Technol., vol. 32, no. 3, pp. 394–397, 1998.
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8. O. Larue at al., “Pressure electroosmotic dewatering with continuous removal of electrolysis products”, Chem. Eng. Sci., vol. 61, no. 14, pp. 4732–4740, 2006.
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