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 the model kaolin dispersion with Сd = 8 g/dm3, and their efficiency exceeds both that of the copolymers and the earlier obtained PCCs with nonionogenic polyacrylamide (PAA). In contrast to weakly charged polycationites, the fully charged KF-99 polyelectrolyte does not form PCCs and the products of its mixing with APHC do not reveal an increased flocculating effect.
Highlights
At present, the problem of water supply acquires a global strategic significance since, firstly, water turned out to be the main deficit of the XXI century, and, secondly, control over high quality and safety of consumable water became urgent
The polymer-colloid complexes (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 the model kaolin dispersion with Сd = 8 g/dm3, and their efficiency exceeds both that of the copolymers and the earlier obtained PCCs with nonionogenic polyacrylamide (PAA)
In terms of adopted ideas about the cooperativity of noncovalent interactions in the polymerparticle system, we have recently studied the formation of PCCs during interaction of positively charged aluminoxane particles (APs) in APHC sols with weakly charged cationic polyelectrolytes (WCPEs) from the Praestol and Organopol series [30]
Summary
The problem of water supply acquires a global strategic significance since, firstly, water turned out to be the main deficit of the XXI century, and, secondly, control over high quality and safety of consumable water became urgent. As regards use in practice, the PCCs based on sols of high-basicity aluminum polyhydroxochloride (APHC) and polyacrylamide have been studied most extensively [19,20,21] The composition of such polycomplexes suggests their use as stability regulators for dispersed systems among which are both natural waters and sewages. The area of this surface plays the decisive role on condition that reactive centers occur on it As it was shown in [15], that is why low-molecular-mass aluminum salts do not form PCCs with polyacrylamide, while high-basicity APHC sols, which represent the dispersed system of aluminoxane particles (APs) mostly composed of species with a size of 4.6 nm and a specific surface area of 3 × 102 m2/cm3 [28,29] form soluble PCCs with the nonionogenic PAA
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