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Mechanistic insights into the role of surface excess in separation membrane performance
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DOI：10.1016/j.seppur.2025.134652.png)
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Abstract
En 中文
Surface excess refers to the difference of the solute concentration at the interface from that in the bulk phase. When it is positive, the solute is more at the interface and vice versa. It may have various effects on the performance of separation membranes, e.g. by the presence of pure water layer at the membrane surface on reverse osmosis, by the formation of gas layer at the membrane surface on membrane distillation and membrane degassing, and by the deposition of contaminants at the membrane surface on water treatment. Difference in the composition of organic solvent mixtures at the interface from the bulk may also affect the membrane performance in organic solvent nanofiltration. The surface excess of gas, liquid and solid can be evaluated at the air/solution and the solution/solid interface by the Gibbs Adsorption Isotherm equation and the reverse liquid chromatographic method. The objective of this short communication is to present several examples of surface excess data, at air/solution and solution/solid material interfaces, to demonstrate that the information on surface excess is important to understand and control the membrane separation processes.
Keywords:
surface excess
Gibbs Adsorption Isotherm
membrane separation
interfacial phenomena
solvent nanofiltration
Journal
IF:
9
Papers:
2.9W
Citations:
12.1W
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