Abstract
Emulsion separation is important in chemical industry and environmental protection. This study hopes to provide a solution to the loss of performance due to poor mass transfer modes of emulsion separation membranes. The superhydrophilic/underwater superoleophobic metal-phenolic networks (MPNs) were synthesised using tannic acid and Ti. The networks were then modified by polyvinyl alcohol-glutaraldehyde gels to reduce their self-polymerisation tendency. The gel-modification transformed the main transfer channels from cracks in MPNs to voids in particles, which are more suitable for emulsion separation. The mechanism was investigated by characterisation and DFT calculations. Experiments showed that the modified membranes had stable permeability to both laboratory simulated emulsions and real emulsions, with a permeability retention rate of 96.81 % after 2 h. Moreover, the mass transfer modes before and after gel-modification were inferred. An equation for water flux prediction was obtained. This study provides insight for the design and optimization of efficient oil/water separation membranes.
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