СHITOSAN FND CATIONIC STARCH AS A FLOCCULANTS FOR THE DISPERSION OF SILICON DIOXIDEСHITOSAN FND CATIONIC STARCH AS A FLOCCULANTS FOR THE DISPERSION OF SILICON DIOXIDE
DOI:
https://doi.org/10.15421/jchemtech.v31i3.279904Keywords:
cationizing reagent; cationic starch; chitosan; flocculation;. SiO2 dispersion; turbidimetry; thermal analysisAbstract
The polysaccharides chitosan with deacylation degree equal to 82% and cationic starch with a degree of hydrogen substitution in glucopyranose links for N,N,N-triethyl-N-2-hydroxypropylammonium fragment (20%) were used as flocculants in a 0.5% aqueous dispersion of ground quartz (silica, SiO2). Using the turbidimetric method it was shown that the flocculation rate of SiO2 particles depends on the pH value and the setting method of the dispersion medium pH.
The turbidimetric method and thermal analysis show that effective flocculation occurs when the SiO2 dispersion is acidified to pH 2, followed by the addition of flocculant and setting the value of pH 5 by adding NaOH. This is explained by the greatest adsorption of cationic polysaccharides on the surface of SiO2 particles in the acidic environment (pH 2) of the SiO2 dispersion.
Flocculation in a 0.5% aqueous SiO2 dispersion has an extreme dependence on the concentration of flocculants, both chitosan and cationic starch. The highest flocculation rate is observed at a chitosan concentration of 588 mg/L and a cationic starch concentration of 560 mg/L. At lower concentrations the optimum density of adsorption layers on the dispersion particles surface is insufficient for effective flocculation, and at higher concentrations the adsorption layers of flocculants are formed, which partially stabilize the dispersed phase.
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