title: Flocculation performance of a cationic biopolymer derived from a cellulosic source in mild aqueous solution.
abstract: The flocculation behavior of cationic, quaternary ammonium groups containing cellulosic biopolymers, CDACs, synthesized by cationizing dialdehyde cellulose in mild aqueous solution was studied in a kaolin suspension. In particular, the role of CDAC dosage and solution pH, NaCl concentration, and temperature were clarified. In addition, the initial apparent charge densities (CDs), particle sizes, ζ-potential, and stability of CDs were determined. CDACs possessed a high flocculation activity in neutral and acidic solutions, but a significant decrease was observed in alkaline solutions (pH >9). This was also seen as a decline in the apparent CD and particle size of the CDACs in alkaline conditions. The measurements also indicated that the apparent CD decreased to a constant level of 3 mmol/g in aqueous solutions. However, no notable decrease in flocculation performance was obtained after several days of storage. Moreover, the variation of NaCl concentration and temperature did not affect the flocculation activity.
authors.affiliation: Fiber and Particle Engineering Laboratory, P.O. Box 4300, FI-90014 University of Oulu, Finland. henrikki.liimatainen@oulu.fi
authors.forename: Henrikki
authors.initials: H
authors.lastname: Liimatainen
authors.forename: Juho
authors.initials: J
authors.lastname: Sirviö
authors.forename: Ola
authors.initials: O
authors.lastname: Sundman
authors.forename: Miikka
authors.initials: M
authors.lastname: Visanko
authors.forename: Osmo
authors.initials: O
authors.lastname: Hormi
authors.forename: Jouko
authors.initials: J
authors.lastname: Niinimäki
mesh_terms: D001704:Biopolymers; D002412:Cations; D002482:Cellulose / Q000737:chemistry*; D005427:Flocculation; D012996:Solutions; D014867:Water
chemical_list: D001704:Biopolymers; D002412:Cations; D012996:Solutions; D014867:Water; D002482:Cellulose