Reverse osmosis performance of homopolymers and copolymers of poly(amide-sulfonamide)s

Wing Hong Chan*, Suei Yee Lam-Leung, Ching Fai Ng, Shiping Xi, Junqi Ding, Xumin He

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

8 Citations (Scopus)


Ten homopolymers and 15 copolymers of poly(amide-sulfonamide)s were synthesized by low-temperature solution polycondensation of five different diamines with isophthalopyl chloride/terephthaloyl chloride in N,N-dimethylacetamide. The general reverse osmosis (RO) performance of these new membrane materials were investigated by a systematic screening test with 270 ppm nickel ion industrial waste as the feed solution. A copolymer series based on 2,5-dimethylpiperazine, 1,3-diaminopropane and terephthaloyl chloride emerged as the best polymer system in terms of RO separation characteristics. Optimization of membrane fabrication of one of this series, with a 7:3 ratio of the two diamines was carried out by fixing the evaporation temperature at 65°C and varying the evaporation time and casting solution composition. The RO tests for the membrane were performed at 20 kg cm-2 operating pressure on three different feed solutions. Membranes showed salt rejection of up to 98.6 and 94.3% at a flux of 13 cm per day for nickel and sodium ion feeds, respectively.

Original languageEnglish
Pages (from-to)99-103
Number of pages5
Issue number1
Publication statusPublished - Jan 1997

Scopus Subject Areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

User-Defined Keywords

  • Membrane materials
  • Poly(amide-sulfonamide)s
  • Reverse osmosis


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