Modification of PES ultrafiltration membranes by cationic polyelectrolyte Praestol 859: Characterization, performance and application for purification of hemicellulose

Research output: Contribution to journalArticle


Novel approach for membrane modification to improve separation performance and antifouling stability was proposed. It involves using of 0.1–0.3 wt.% aqueous solutions of Praestol 859 (cationic polyelectrolyte based on copolymer of acrylamide and 2-acryloxyethyltrimethylammonium chloride) as coagulants upon membrane preparation via non-solvent induced phase separation. It was shown that the addition of small amounts (0.1–0.3 wt.%) of Praestol 859 into the coagulation bath leads to an increase in membrane pure water flux from 51 up to 68 L m−2 h−1 without decreasing membrane retention. Contact angle for modified membranes decreased from 64° down to 55°. Immobilization of Praestol 859 on the surface of a selective membrane layer was confirmed by FTIR spectroscopy. It was found that the addition of Praestol 859 into the coagulation bath suppressed the macrovoid formation in the membranes supporting layer due to the decrease of “solvent-non-solvent” exchange rate which is attributed to the significant increase of viscosity of the coagulation bath. The separation performance of modified membranes for fractionation of thermomechanical pulp mill process water, for concentration and purification of hemicellulose for further processing was studied. It was found that membrane modification by Praestol 859 leads to 2–6 times increase of flux, increase of fouling recovery ratio and improvement of cleaning efficiency without decreasing membrane rejection with regard to hemicelluloses (91.5–93%) and lignin (21–22%) as reference components.


External organisations
  • Instituto Superior Técnico
  • National Academy of Sciences of Belarus (NASB)
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Process Engineering


  • Membrane processes, Ultrafiltration, Membrane modification
Original languageEnglish
Pages (from-to)187-199
Number of pages13
JournalChemical Engineering Research and Design
Publication statusPublished - 2020 Oct
Publication categoryResearch