Advances in materials Research

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Coagulant bath medium effect towards polylactic acid membranes structure and methylene blue dye removal

  • Amira M. Nasib (Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis) ;
  • Stephen Simon (Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis) ;
  • Syahmie M. Rasidi (Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis) ;
  • Siti Kartini E. Ab. Rahim (Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis) ;
  • Hoo Peng Yong (Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis) ;
  • Ng Qi Hwa (Faculty of Chemical Engineering & Technology, Universiti Malaysia Perlis) ;
  • Khairiraihanna Johari (Department of Chemical Engineering, Universiti Teknologi PETRONAS)
  • Received : 2023.08.18
  • Accepted : 2024.01.04
  • Published : 2024.06.25
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Abstract

The asymmetric polylactic acid (PLA) membrane was prepared via phase inversion method using non-solvent induced separation (NIPS) technique. This study aims to synthesized as well as to characterize the PLA membrane and evaluating the membrane performance on water flux and permeability. In addition, this research also studied the removal performance of methylene blue dye. The polymer solution has been prepared using 12 wt.% of PLA and dissolved in 88 wt.% of Dimethylacetamide (DMAc) as a solvent. Then, the cast film was immersed in different ratio of coagulant bath medium (distilled water: methanol: ethanol) ranging from 100:0:0, 75:25:0, 75:0:25 and 75:12.5:12.5, respectively). Several characterizations were performed which include, membrane contact angle and membrane porosity. Performance PLA membranes were determined in terms of water flux and permeability at 1 bar transmembrane pressure using dead-end permeation cell. Finally, methylene blue (MB) removal efficiency was tested at the same transmembrane pressure. The findings revealed that the increase of alcohol concentration in coagulant bath resulted in higher porosity and lower contact angle. In short, MB dye rejection efficiency is also closely related to the amount of alcohol ratio used in coagulant baths. Increases in concentration of methanol and ethanol in coagulant bath medium increases the membrane porosity thus increased in efficiency of methylene blue rejection.

Keywords

Acknowledgement

The authors would like to acknowledge Frontiers Material Research, Centre of Excellence (FRONMATE), Faculty of Chemical Engineering Technology and Research, Management Centre (RMC) of Universiti Malaysia Perlis.

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