Fabrication of a new type of PVA/SSA/GA cation exchange membrane for desalination using membrane capacitive deionization

  • Tung Thanh Nguyen
  • Tuan Ngan Nguyen
  • Long Hoang Ngo
Keywords: Cation exchange membrane, capacitive deionization, polyvinyl alcohol, sulfosuccinic acid, glutaric anhydride

Abstract

Nowadays the lack of clean water is becoming a serious problem, due to the increasing
demand for clean water, along with global climate change. Desalination of sea water or
brackish water has been considered a practicable method to supply clean water. Among
desalination technologies, membrane capacitive deionization (MCDI) has emerged for
the last 15 years as an alternative method and received a lot of research attention since
then. In this study, low-cost and ecofriendly PVA/SSA/GA composite membranes were
fabricated through the crosslinking reaction of sulfosuccinic acid (SSA) and glutaric
anhydride (GA) with polyvinyl alcohol (PVA). The effect of SSA and GA content was
investigated. The presence of SSA in the cation exchange membrane, which was proven
by FT-IR, helps improve its water uptake (98.5 % compared to 38.2 %) as well as cation
exchange capacity (1.993 mmol.g-1
compared to 0.156 mmol.g-1
). The PVA/SSA/GA
composite solution was coated on the electrode, and the membrane's ability to desalinate
water was assessed. The membrane-coated electrode exhibited enhanced salt adsorption
capacity and shorter desalination time (13.4 minutes compared to 85.3 minutes) in
comparison with the uncoated commercial electrode, indicating that the PVA/SSA/GA
membrane is a suitable candidate to be utilized in the MCDI systems.
® 2022 Journal of Science and Technology - NTTU

Published
2022-05-09