Preparation and characterization of CS/PDA-PVDF/PVP-modified membranes 


Vol. 26,  No. 1, pp. 41-49, Jan.  2025
10.1007/s12221-024-00812-0


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  Abstract

In the purification of oily wastewater, polyvinylidene fluoride (PVDF) nanofiber membranes have attracted widespread attention for their excellent water-oil separation performance. And chitosan (CS), as a natural polymeric alkaline polysaccharide containing many functional groups interacting with heavy metal ions, such as -NH2 and -OH, has been widely used to treat heavy metal ions in wastewater. However, a few studies have been conducted on superhydrophilic and underwater hydrophobic PVDF composite membranes for the simultaneous removal of heavy metal ions and oil from wastewater. In this paper, PVDF/PVP composite membranes were used as the substrate of separation membranes, and PVDF/PVP-modified membranes were prepared by surface coating with PDA and CS in turn. Among them, CS can be coated on the surface of PVDF/PVP composite membrane by cross-linking the amino group on the molecule with the quinone structure in the PDA molecule to form a stable CS/PDA gel layer. Compared with other modified membranes, CS/PDA-PVDF/PVP has better hydrophilicity and underwater oleophobicity. The underwater OCA of dichloromethane could reach 161°, and the OCA of other oils were above 140°. The water flux was 14,171 L m−2 h−1. After 15 mixture and emulsion separation tests, the separation efficiency was higher than 99% and 98%, respectively. The adsorption efficiency for Cu2+, Pb2+, and Cr3+ aqueous solutions with concentrations of 10-60 mg/L reached more than 80%. Therefore, this method has great potential in treating oily wastewater.

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  Cite this article

[IEEE Style]

X. Zhou, B. Xin, D. Gao, M. A. A. Newton, "Preparation and characterization of CS/PDA-PVDF/PVP-modified membranes," Fibers and Polymers, vol. 26, no. 1, pp. 41-49, 2025. DOI: 10.1007/s12221-024-00812-0.

[ACM Style]

Xinnan Zhou, Binjie Xin, Di Gao, and Md. All Amin Newton. 2025. Preparation and characterization of CS/PDA-PVDF/PVP-modified membranes. Fibers and Polymers, 26, 1, (2025), 41-49. DOI: 10.1007/s12221-024-00812-0.

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