Flocculating Properties of Water-Soluble Polymer-Colloid Complexes of Aluminoxane Particles with Weakly Charged Cationic Polyelectrolytes

Radchenko, S. S.; Новаков, И. А.; Radchenko, Philipp S.; Van, Cong Le; Rybakova, Elena V.

doi:10.4236/jwarp.2011.34027

JWARP

2011

DOI: 10.4236/jwarp.2011.34027

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Flocculating Properties of Water-Soluble Polymer-Colloid Complexes of Aluminoxane Particles with Weakly Charged Cationic Polyelectrolytes

S. S. Radchenko¹,

И. А. Новаков²,

Philipp S. Radchenko

et al.

Abstract: The flocculating properties of polymer-colloid complexes (PCCs) formed via noncovalent interactions of positively charged aluminoxane particles (APs) with macromolecules of weakly charged cationic acrylamide copolymers from the Praestol and Organopol series have been studied. The PCCs that spontaneously formed during mixing of sols of a high-basicity aluminum polyhydroxochloride (APHC) with aqueous solutions of the copolymers exhibit high flocculating ability under the conditions of gravity sedimentation of th… Show more

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Optimization of physicochemical process for pre-treatment of fine suspension by flocculation prior to dewatering

Oyegbile

Narra

2015

Desalination and Water Treatment

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A B S T R A C TIn the design of process reactors, it is often necessary to tailor the separation technique to the dynamics and characteristics of the working slurry. This study reports the results of physicochemical optimization tests conducted on a model system prior to its pre-treatment in a Taylor-Couette device. The assessment of the flocculation performance was carried out on the basis of surrogate indicators such as sludge volume index I SV and supernatant turbidity; which were chosen on the strength of a preliminary investigation and the particular solid-liquid separation method employed in this study. The results of this investigation showed that the lowest sludge volume index I SV of 4.2 and residual turbidity of 7.27 NTU were obtained at the optimum polymer dose of 2 kg/t TS in single conditioning and 4 kg/t in dual additions. Theoretical charge neutralization of 48.4, 37.8, and 49.1% for the single conditioning and 32.1, 25.1, and 32.6% for the dual additions were recorded at the optimum conditions. The optimum dosage values confirmed polymer bridging as the primary flocculation mechanism. The analysis provides information on the slurry polymer dose response and will serve as a guide for polymer selection and subsequent performance optimization of the pre-treatment devices under development.

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Optimization of physicochemical process for pre-treatment of fine suspension by flocculation prior to dewatering

Oyegbile

Narra

2015

Desalination and Water Treatment

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Rheological Properties of Hybrid Hydrogels of Weakly Charged Polyelectrolytes Crosslinked by Aluminoxane Particles

Radchenko¹,

Новаков²,

Radchenko³

et al. 2013

CMATERIALS

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The rheological behavior of hybrid hydrogels of weakly charged polyelectrolytes with alumino xane particles (APs) formed by noncovalent interactions has been studied. This interaction observed for the polyelectro lyte Praestol-2500 is the most pronounced and is due to strong electrostatic noncovalent bonds between positively charged APs and anionic groups of the copolymer. By the methods of capillary, rotational, and vibrational rheo metry, it has been ascertained that two processes compete: the co mpacting of coils of macro molecu les and their crosslinking through APs. The latter process dominates at relatively high concentrations of reagents, and depends on ratios between polymer units and APs and the presence of a low-molecular-mass indifferent electrolyte (NaCl). Formed hybrid hydrogels relate to physical gels with the unstable nature of the network o f physical bonds, and under the action of shear stress demonstrate "Weissenberg effect." The method of dynamic mechanical analysis with the use of a micro-Fourier rheo meter has shown that the ratio storage modulus -loss modulus depends on the amount of AP sol and its ratio to the quantity of copolymer in the init ial mixture. A scheme for spatial structure hybrid hydrogels has been suggested.

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Flocculating Properties of Water-Soluble Polymer-Colloid Complexes of Aluminoxane Particles with Weakly Charged Cationic Polyelectrolytes

Cited by 2 publications

References 20 publications

Optimization of physicochemical process for pre-treatment of fine suspension by flocculation prior to dewatering

Optimization of physicochemical process for pre-treatment of fine suspension by flocculation prior to dewatering

Rheological Properties of Hybrid Hydrogels of Weakly Charged Polyelectrolytes Crosslinked by Aluminoxane Particles

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