Synthesis and characterization of novel g-C3N4 modified thin film nanocomposite reverse osmosis membranes to enhance desalination performance and fouling resistance

Soulmaz Seyyed Shahabi, Najmedin Azizi*, Vahid Vatanpour

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

The modified thin film nanocomposite reverse osmosis (TFN-RO) membranes were fabricated by embedding the synthesized graphitic carbon nitride (g-C3N4) nanosheets as a hydrophilic modifier in the polyamide layer. The g-C3N4 nanosheets were synthesized using thermal oxidation of melamine. SEM and AFM analyses were used to probe the surface changes of the unmodified and modified membranes. The results of AFM analysis showed the decrease in surface roughness of the modified membranes compared to the unmodified one. The contact angle measurement of the membranes indicated the increase in hydrophilicity of the g-C3N4 embedded membranes, which caused to improve in pure water flux. The rejection of NaCl increased with embedding the g-C3N4 nanosheets and reached to its maximum value (99.7%) in the membranes containing 0.015 wt% of nanosheets. The investigation of antifouling performance using BSA/NaCl solution showed that modified membranes with 0.015 wt% of the embedded g-C3N4 nanosheets had the better performance compared with the unmodified membranes.

Original languageEnglish
Pages (from-to)430-440
Number of pages11
JournalSeparation and Purification Technology
Volume215
DOIs
Publication statusPublished - 15 May 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Antifouling
  • Desalination
  • g-CN nanosheets
  • Reverse osmosis
  • Thermal oxidation

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