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Influence of functional polyelectrolytes on the stability of clay hydrodispersions

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Abstract

The destabilization of disperse systems using flocculation is an approach in hydrometallurgy, purification of wastewater, agriculture, etc. The recent efforts here have been made in development of polyelectrolytes. In this work, the bentonite clay hydrodispersions stability under the influence of polyelectrolytes, differing in molar ratio, and types of functionality, was investigated. The dispersions obtained were characterized by spectrophotometry, conductivity measurements, viscometry. The stability of clay hydrodispersions was studied by the turbidimetric method. Under the influence of a polyelectrolyte containing non-ionizable acetate and amide groups, a slight increase in hydrodispersions’ destabilization with the number of very weakly positively charged amide groups was observed. In the presence of polyelectrolytes containing vinyl acetate and well-ionizable aliphatic amine groups, the hydrodispersions’ destabilization was clearly expressed. A pronounced decrease in the hydrodispersion stability was observed under the influence of polyelectrolytes obtained from the highly-ionized 2-vinylpyridine and diethylaminoethylmethacrylate. Polyelectrolytes obtained from vinyl acetate and highly-ionized aliphatic amino-groups had more pronounced effect on destabilization. Hence, features of polyelectrolyte nature, composition, charge density and molecular weight effect on the stability of bentonite clay were elucidated. The selection of the appropriate dose of coagulants and flocculants was demonstrated to be nonlinear function of turbidity.

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Correspondence to Sayat Mameshova.

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Asanov, A., Mameshova, S. Influence of functional polyelectrolytes on the stability of clay hydrodispersions. Chem. Pap. 75, 5695–5703 (2021). https://doi.org/10.1007/s11696-021-01718-4

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