Employing lignin in the formation of the selective layer of thin-film composite membranes for pervaporation desalination

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Abstract

This work reports a study on employing lignin in the formation of a selective layer of thin-film composite (TFC) membranes for pervaporation desalination. The TFC membranes with lignin-based separation layers are fabricated using a solution-casting method. With a reduction of the separation layer thickness to about 0.47 μm, a water permeation flux of 18.5 kg h-1 m-2 and a salt rejection of above 99.95% have been recorded on the lignin based TFC membrane with a feeding solution of 3.5 wt% NaCl(aq) at 45 °C. The membrane also exhibits high stability in long-term operation tests and can be applied for operations on high salinity water (up to 15 wt% NaCl(aq)). While being applied to seawater desalination, the membrane exhibits a water permeation flux of about 20.4 kg h-1 m-2 and a salt rejection of above 99.95% at 45 °C. A membrane separation process, which uses sustainable materials for salty wastewater treatments and water resource generation, has been demonstrated.

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Chen, Y. T., Sun, Y. M., Hu, C. C., Lai, J. Y., & Liu, Y. L. (2021). Employing lignin in the formation of the selective layer of thin-film composite membranes for pervaporation desalination. Materials Advances, 2(9), 3099–3106. https://doi.org/10.1039/d1ma00150g

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