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Flocculation performance of a cationic biopolymer derived from a cellulosic source in mild aqueous solution
Henrikki Liimatainen1, Juho Sirviö, Ola Sundman
1Fiber and Particle Engineering Laboratory, P.O. Box 4300, FI-90014 University of Oulu, Finland. henrikki.liimatainen@oulu.fi
Bioresource Technology
|August 25, 2011
Summary
Cationic cellulose biopolymers (CDACs) effectively flocculate kaolin suspensions in neutral to acidic conditions. Their flocculation performance remains stable over time and is unaffected by salt or temperature variations.
Area of Science:
- Materials Science
- Colloid and Surface Chemistry
Background:
- Cellulosic biopolymers are versatile materials with potential applications in water treatment.
- Cationic modification enhances the interaction of biopolymers with negatively charged particles.
Purpose of the Study:
- To investigate the flocculation behavior of cationic dialdehyde cellulose (CDACs) in kaolin suspensions.
- To elucidate the influence of CDAC dosage, pH, NaCl concentration, and temperature on flocculation efficacy.
Main Methods:
- Synthesis of CDACs via cationization of dialdehyde cellulose.
- Flocculation tests using kaolin suspensions.
- Measurement of apparent charge densities, particle sizes, and zeta potential.
- Stability tests under varying storage conditions.
Main Results:
- CDACs exhibit high flocculation activity in neutral and acidic pH ranges.
- Flocculation efficiency and apparent charge density decrease significantly in alkaline solutions (pH >9).
- NaCl concentration and temperature do not notably impact flocculation activity.
Conclusions:
- CDACs are effective flocculants for kaolin suspensions, particularly in neutral to acidic environments.
- Alkaline conditions negatively affect CDAC performance due to changes in their properties.
- CDACs demonstrate good storage stability without significant loss of flocculation performance.
