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Novel thermosensitive flocculanting agent based on pullulan.

Luminita Ghimici1, Marieta Constantin

  • 1Petru Poni Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania. lghimici@icmpp.ro

Journal of Hazardous Materials
|June 28, 2011
PubMed
Summary
This summary is machine-generated.

A novel thermosensitive polysaccharide (P-g-pNIPAAm) was synthesized for effective clay flocculation. This grafted polymer demonstrated superior performance above its lower critical solution temperature (LCST), showing potential in water treatment applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Environmental Engineering

Background:

  • Developing efficient flocculants is crucial for water purification and solid-liquid separation.
  • Thermosensitive polymers offer tunable properties for controlled flocculation processes.
  • Graft-polymerization provides a versatile route to synthesize novel functional materials.

Purpose of the Study:

  • To synthesize a new thermosensitive polysaccharide, P-g-pNIPAAm, via graft-polymerization.
  • To evaluate the flocculation efficiency of P-g-pNIPAAm in clay suspensions.
  • To compare its performance with the pNIPAAm homopolymer under varying conditions.

Main Methods:

  • Graft-polymerization of N-isopropylacrylamide (pNIPAAm) onto pullulan (P) using Ce(IV) initiation.
  • Characterization using FT-IR, (1)H NMR spectroscopy, and elemental analysis.
  • Flocculation studies in clay suspension, varying polymer dose, temperature, and settling time.

Main Results:

  • P-g-pNIPAAm was successfully synthesized and characterized.
  • Effective clay flocculation was observed both below and above the lower critical solution temperature (LCST).
  • Flocculation was significantly more effective above the LCST, yielding lower residual turbidity and larger flocs.

Conclusions:

  • The synthesized thermosensitive polysaccharide P-g-pNIPAAm is an effective flocculant for clay suspensions.
  • Performance is enhanced above the LCST, indicating temperature-responsive behavior is beneficial for flocculation.
  • The negligible re-dispersion effect suggests stable flocs, advantageous for water treatment.