Specifics of kaolin dispersion flocculation due to a polyelectrolyte complex formation on particle surface

Dryabina, S. S.; Rudenko, Maria S.; Shulevich, Yu. V.; Навроцкий, А. В.; Новаков, И. А.

doi:10.1007/s00396-020-04623-6

Cited by 5 publications

(3 citation statements)

References 39 publications

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“…These components make such hybrids efficient systems allowing to control coagulation and flocculation in multicomponent disperse systems. As compared with individual coagulants and flocculants, such hybrids offer a suitable alternative for performing sedimentation of suspensions and sols [10][11]. Our previous papers [12][13][14] characterize major aspects of flocculation processes involving cationic polymer-inorganic hybrids and TiO2 as a model disperse system and performed in the free (unhindered) settling mode.…”

Section: Introductionmentioning

confidence: 99%

Flocculation of Disperse Systems by Polyfunctional Polymer-Inorganic Hybrids

2022

Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.

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Development of novel high-capacity multifunctional flocculants is a promising solution to selective separation of clay suspensions. Among such flocculants, polymer-inorganic hybrids are the most attractive for their excellent performance as compared with inorganic coagulants or syn-thetic polymers. Synthesis of polymer-inorganic hybrids was carried out in two stages. At the first stage, Al(OH)3sol was obtained by condensation of aluminum chloride and ammonium carbonate in the following conditions: t = 70°C, pH = 3-4, intensive stirring. In the second stage, Al(OH)3was mixed with aqueous solutions of polymers at room temperature. By changing the melting tem-perature of hybrid samples, the presence of interactionsbetween the Al3+cation and the carboxylate groups of the analyzed acrylamide copolymers were established. This paper reports synthesis and comparative efficiency analysis of systems that contain water-soluble anionic copolymers of acryla-mide and respective polyfunctional polymer-inorganic hybrids. We performed a quantitative char-acterization of concentration and structural effects of polymer flocculants on the flocculation mechanism and sludge thickening. Sludge thickening constants were determined. Higher values of thickening constants were noted in systems with additives of hybrid samples, due to the participa-tion of their macromolecules in the formation of floccules at the first stage of the sediment process, and at the stage of thickening of sediments,their deformation and compaction were revealed while maintaining a loose structure with the formation of bulk floccules. We considered the factors al-lowing to optimize flocculation of clay dispersions by polymer-inorganic hybrids in aqueous media. These novel flocculants were shown to have a good potential for applications in filtration or flota-tion processes as well as for wastewater treatment for removal of disperse impurities.

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Section: Introductionmentioning

confidence: 99%

Flocculation of Disperse Systems by Polyfunctional Polymer-Inorganic Hybrids

2022

Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.

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“…As model system, often china clay (kaolin) or silica is tested. Different methods for the flocculation of these systems have been reported [ 14 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. However, direct comparison of natural flocculants like chitosan and industrially widely applied synthetic polyelectrolytes, such as copolymers based on acrylamide (e.g., polyacrylamide with trimethylammonium chloride functionality, PAM-TAC) and polydiallyldimethylammonium chloride (PDADMAC), are rarely published.…”

Section: Introductionmentioning

confidence: 99%

“…With often short-chained, flatly adsorbed polyelectrolyte chains that reduce the effective surface charge of the particle to zero, the patch mechanism is destabilizing suspensions by reducing the repulsive forces between particles. With a long-chained, more stiff, and space-taking conformation of the adsorbed polyelectrolytes, collision of different particles leads to their aggregation as the polyelectrolytes are adsorbed to both of them, therefore bridging them together [ 26 , 30 ]. Also, combinations of these two mechanisms are known as the synergistic use of polyelectrolyte complex flocculant systems [ 27 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Flocculation of Silica and China Clay with Chitosan and Synthetic Polyelectrolytes

et al. 2021

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Flocculation is still one of the most important and efficient processes for water treatment. However, most industrial processes, such as in water treatment plants, still use huge amounts of synthetic polyelectrolytes for the flocculation process. Here we compare the flocculation of two different suspended particles, i.e., silica particles and china clay, with the biopolymer chitosan and two common strong synthetic polyelectrolytes. As a flocculant, chitosan featured a minimum uptake rate of 0.05 mg/g for silica and 1.8 mg/g for china clay. Polydiallyldimethylammonium chloride (PDADMAC) for comparison possessed a minimum uptake rate of 0.05 mg/g for silica and 2.2 mg/g for china clay. Chitosan as an environmentally friendly biopolymer competes with the synthetic polyelectrolytes and thus represents a beneficial economic alternative to synthetic flocculants.

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The synthesis of an acrylamide copolymer and its synergistic effects on clay flocculation of red tide organisms

Qian

Song

et al. 2023

Journal of Environmental Management

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Specifics of kaolin dispersion flocculation due to a polyelectrolyte complex formation on particle surface

Cited by 5 publications

References 39 publications

Flocculation of Disperse Systems by Polyfunctional Polymer-Inorganic Hybrids

Flocculation of Disperse Systems by Polyfunctional Polymer-Inorganic Hybrids

A Comparative Study on the Flocculation of Silica and China Clay with Chitosan and Synthetic Polyelectrolytes

The synthesis of an acrylamide copolymer and its synergistic effects on clay flocculation of red tide organisms

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