STUDY OF THE CHARACTERISTICS OF CATIONIC FLOCULANT IN WATER-SALT MEDIA
Rubrics: 1. CHEMISTRY
Authors:
1.
KNITU; KNRTU
Type:
Article
Pages:
from 5
to 9
Status:
Published
Received:
22.12.2025
Accepted:
23.12.2025
Published:
23.12.2025
Language:
Russian
Keywords:
CATIONIC WATER-SOLUBLE POLYELECTROLYTE, POWDER, FLOCCULATION, WATER-SALT MEDIA, CONSTRAINED DEPOSITION, ELECTROKINETIC POTENTIAL (ZETA-POTENTIAL)
Abstract (English):
The work is devoted to finding a physicochemical and colloid-chemical justification for the use of the cationic water-soluble polyelectrolyte poly(diallyldimethylammonium chloride) (VPK-402) to accelerate the sedimentation of model dispersions in a restricted precipitation mode in aqueous and aqueous-saline media. Ochre, zinc oxide, titanium dioxide, talc, as well as low-molecular electrolytes: sodium and potassium chlorides and sodium thiosulfate were selected for the study. The density of powder particles was measured. Two methods were used to estimate the average particle size of the powders, and their polydispersity was characterized. The deposition of powder dispersions in a confined mode was studied. The electrokinetic potential of the particles was measured, and the effect of polymer adsorption on the value of the z-potential was investigated. Concentration dependencies of polyelectrolyte viscosity in aqueous and aqueous-saline media were obtained. The peculiarities of the polyelectrolyte behavior of the cationic flocculant VPK-402 were investigated. The concentration range of the polyelectrolyte swelling effect was determined. The constants of the Foucault equation were calculated. The suppression of polyelectrolyte swelling in aqueous-saline media was demonstrated. The kinetics of restricted precipitation of a model dispersion in the presence of VPK-402 in aqueous-saline media were investigated. It has been shown that the rate of dispersion clarification is determined not by the nature of the electrolyte, but by the ionic strength of the solution. The influence of two mechanisms, coagulation and flocculation, on the rate of phase separation has been evaluated. It has been shown that at high polymer concentrations, the factor of change in the conformation of polyelectrolyte macromolecules plays a decisive role.
The work is devoted to finding a physicochemical and colloid-chemical justification for the use of the cationic water-soluble polyelectrolyte poly(diallyldimethylammonium chloride) (VPK-402) to accelerate the sedimentation of model dispersions in a restricted precipitation mode in aqueous and aqueous-saline media. Ochre, zinc oxide, titanium dioxide, talc, as well as low-molecular electrolytes: sodium and potassium chlorides and sodium thiosulfate were selected for the study. The density of powder particles was measured. Two methods were used to estimate the average particle size of the powders, and their polydispersity was characterized. The deposition of powder dispersions in a confined mode was studied. The electrokinetic potential of the particles was measured, and the effect of polymer adsorption on the value of the z-potential was investigated. Concentration dependencies of polyelectrolyte viscosity in aqueous and aqueous-saline media were obtained. The peculiarities of the polyelectrolyte behavior of the cationic flocculant VPK-402 were investigated. The concentration range of the polyelectrolyte swelling effect was determined. The constants of the Foucault equation were calculated. The suppression of polyelectrolyte swelling in aqueous-saline media was demonstrated. The kinetics of restricted precipitation of a model dispersion in the presence of VPK-402 in aqueous-saline media were investigated. It has been shown that the rate of dispersion clarification is determined not by the nature of the electrolyte, but by the ionic strength of the solution. The influence of two mechanisms, coagulation and flocculation, on the rate of phase separation has been evaluated. It has been shown that at high polymer concentrations, the factor of change in the conformation of polyelectrolyte macromolecules plays a decisive role.
Keywords:
CATIONIC WATER-SOLUBLE POLYELECTROLYTE, POWDER, FLOCCULATION, WATER-SALT MEDIA, CONSTRAINED DEPOSITION, ELECTROKINETIC POTENTIAL (ZETA-POTENTIAL)
CATIONIC WATER-SOLUBLE POLYELECTROLYTE, POWDER, FLOCCULATION, WATER-SALT MEDIA, CONSTRAINED DEPOSITION, ELECTROKINETIC POTENTIAL (ZETA-POTENTIAL)
