Iranian Journal of Chemistry

Iranian Journal of Chemistry

Investigating the surface energy of cation exchange membranes containing graphene oxide and evaluating their performance characteristics

Document Type : Original Article

Authors
Seyedeh Maryam Zia Firouzabadi 1
Leila Naji 2
leila Ghadiri 3
1 Analytical Chemistry Group, Chemistry Department, AmirKabir University of Technology (Polytechnic), Tehran, Iran.
2 Analytical Chemistry Group, Department of Chemistry, Amirkabir University of Technology, Tehran, Iran.
3 Analytical group, chemistry department, Amirkabir University of Technology, Tehran.Iran
10.22036/cr.2025.468758.1252
Abstract
Nowadays, in order to improve the efficiency of ion exchange separation membranes, various methods such as changing the functional groups of the membrane, blending polymers, and using nano-additives are utilized. Due to the desirable properties of graphene oxide (GO), this nanomaterial is considered to modify and improve the performance of ion-exchange separation membranes. The addition of sulfonated graphene oxide (SGO) within the ion exchange membranes has shown a significant effect in improving the electrochemical properties of the membranes. In this research, the surface energy of cation exchange membranes based on polyether sulfone (PES) containing GO and SGO was investigated, by studying the contact angle of the membranes with polar (deionized water) and non-polar (diiodomethane) solutions. The PES-SGO membrane showed the highest surface energy (94.57 J m-2) in the aqueous environment, which led to better performance of this membrane for the separation of sodium ions from water. Meanwhile, the PES-SGO membrane showed higher hydrophilicity (66.16%), higher cation exchange capacity (1.12 meq g-1), higher permselectivity of sodium ions (95.9%), lower surface resistance (1.2 Ω cm2), and desirable chemical stability in the oxidative Fenton solution, compared to the PES-GO membrane.

Graphical Abstract

Investigating the surface energy of cation exchange membranes containing graphene oxide and evaluating their performance characteristics
Keywords
Cation exchange separation membranes
Sulfonated graphene oxide
Surface energy
Chemical stability

Subjects

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  • Receive Date 09 August 2024
  • Revise Date 11 January 2025
  • Accept Date 19 January 2025