Cationic Biocide Anchored Graphene Oxide-Based Membranes for Water Purification

  • Suryasarathi Bose IISc Bangalore
  • Paresh Samantaray
Keywords: PVDF/PBSA membranes, GO (graphene oxide), trans-membrane flux, ROS, anti-fouling, antibacterial.


PVDF/PBSA [poly(vinylidene fluoride)/poly (butylene succinate-co-adipate)] phase inversion membranes were obtained using non-solvent induced phase separation and their porous hierarchical morphology were assessed using SEM. In order to render the membrane surface antibacterial, graphene oxide sheets were modified with a cationic biocide, trihexyltetradecylphosphonium chloride, and were subsequently grafted on the membrane surface through esterification. Successful grafting was confirmed by XPS and supported with NMR studies. A standard plate count method was used to assess the antimicrobial properties taking E. coli and S. aureus as model bacterial systems. To gain insight into the mechanism of bacterial inactivation, intracellular ROS (reactive oxygen species) generation was investigated on the microbial strains. The trans-membrane flux was measured using a cross-flow flux setup. For evaluating the long term efficacy of modified membranes; flux was also measured for different membranes both with pure water and bacterial feed. The membranes were excellent in retaining the flux in a long run after modifications. The anti-fouling performance was carried out using BSA (Bovine serum albumin) as a model biofoulant. The flux recovery ratio was significantly higher as compared
to pristine membranes. Taken together, these modified membranes open new avenues in designing unique membranes for water purification.

Author Biography

Suryasarathi Bose, IISc Bangalore
Dept of Mat Engg, Associate Professor


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