PREPARATION OF AN ION EXCHANGE MEMBRANE WITH HETEROGENEOUSLY STRUCTURED AND SELECTIVE TO MONOVALENT ION

• Main Author: Gunawan, Timmy
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/81993
• Institution: Institut Teknologi Bandung

Ion exchange membrane is a type of membrane that functions as a selective medium for ion separation. This membrane is a crucial component in processes such as electrodialysis, electrolysis, electrodeionization, Donnan dialysis, redox flow batteries, and membrane fuel cells. The performance quality of these electromembrane processes depends on the physiochemical properties, electrochemical properties, and mechanical properties of the membrane. Ion exchange membranes are expected to have high selectivity, low electrical resistance, and good mechanical and chemical stability. In addition, scaling on ion exchange membranes due to the presence of multivalent ions is also a challenge. This research aims to modify the surface of a heterogeneous-structure ion exchange membrane to increase its selectivity for monovalent ions. The membrane will be modified with materials such as dopamine hydrochloride and ACE (4'-aminobenzo-15-crown-5) by the surface codeposition method. The modified membrane will be tested and characterized for its electrochemical properties such as conductivity, permselectivity, and ion exchange capacity (IEC), as well as its physico-chemical and mechanical properties, such as water uptake, water contact angle, composition analysis and morphology of the modified membrane surface layer. The results of membrane surface modification showed an increase in selectivity to monovalent ions, an increase in membrane hydrophilicity, and the formation of functional groups and new layers on the membrane surface as the codeposition time and ACE concentration in the codeposition solution increased. Surface modification carried out with a higher concentration of ACE relatively obtained better membrane performance results compared to using a larger codeposition time.