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Improved Performance of Polysulfone Ultrafiltration Membrane Using TCPP by Post-Modification Method.

Yuandong Jia1, Shuangqing Sun1, Shunshun Li1

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Summary

Tetrakis (4-carboxyphenyl) porphyrin (TCPP) modification enhances ultrafiltration (UF) membranes, improving flux and rejection rates for better sewage purification and desalination. This method offers a new approach for porphyrin materials in membrane separation.

Keywords:
porphyrinprotonationsynergistic effectultrafiltration membrane

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Ultrafiltration (UF) membranes are crucial for water purification but require improved flux and antifouling properties.
  • Tetrakis (4-carboxyphenyl) porphyrin (TCPP) exhibits hydrophilicity and can anchor within membranes via hydrogen bonding under acidic conditions.

Purpose of the Study:

  • To enhance the performance of polysulfone (PSf) ultrafiltration membranes using Tetrakis (4-carboxyphenyl) porphyrin (TCPP) modification.
  • To investigate the synergistic effects of TCPP and sodium bicarbonate (NaHCO3) on membrane flux and rejection rates.

Main Methods:

  • TCPP was dissolved using NaHCO3 and modified onto a polysulfone (PSf) membrane matrix via a method analogous to interfacial polymerization.
  • Trimesoyl chloride (TMC) was used to create the acidic environment necessary for TCPP protonation and anchoring.
  • Membrane performance was evaluated by measuring pure water flux and rejection rates for bovine serum albumin (BSA).

Main Results:

  • For high-rejection membranes (Z1 16:1), TCPP modification increased pure water flux by 34% while maintaining over 95% BSA rejection.
  • For low-rejection membranes (B2 32:1), TCPP modification increased BSA rejection from 81% to 96%, with flux remaining comparable to existing UF membranes.
  • The observed improvements are attributed to the combined effect of protonated TCPP enhancing flux and NaHCO3 increasing rejection.

Conclusions:

  • TCPP modification offers a viable strategy to simultaneously enhance both flux and rejection in ultrafiltration membranes.
  • This approach demonstrates the potential of porphyrin-based materials for advanced membrane separation applications.
  • The synergistic interaction between TCPP and NaHCO3 is key to achieving dual performance improvements.