Preparation of Tannic Acid-Pectin Coated PVDF Membrane for High-Efficiency Separation of Oil and Water Emulsions

Zhai, Liangku; Cui, Jiuyun; Lu, Lei; Wang, Hailong; Wei, Can; Luo, Jirong; Xie, Atian

doi:10.3390/membranes15050155

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Preparation of Tannic Acid-Pectin Coated PVDF Membrane for High-Efficiency Separation of Oil and Water Emulsions

by

Liangku Zhai

¹,

Jiuyun Cui

^1,2,*,

Lei Lu

¹,

Hailong Wang

³,

Can Wei

¹,

Jirong Luo

¹ and

Atian Xie

^1,*

¹

School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China

²

Anhui International Joint Research Center for Nano Carbon-based Materials and Environmental Health, Anhui University of Science and Technology, Huainan 232001, China

³

Hangmo New Materials Group Co., Ltd., Huzhou 313300, China

^*

Authors to whom correspondence should be addressed.

Membranes 2025, 15(5), 155; https://doi.org/10.3390/membranes15050155 (registering DOI)

Submission received: 26 March 2025 / Revised: 10 May 2025 / Accepted: 13 May 2025 / Published: 16 May 2025

(This article belongs to the Special Issue Emerging Superwetting Membranes: New Advances in Water Treatment)

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Abstract

The simple preparation of superhydrophilic membranes with good stability is of great significance for efficient oil–water separation. In this work, a polyvinylidene fluoride (PVDF) membrane modified with tannic acid (TA) and pectin (PT) was developed through immersion in TA/PT solutions, facilitating the formation of complexes via co-deposition. The optimized PVDF@TA/PT3 membrane exhibited superhydrophilicity/superoleophobicity. The membrane achieved remarkable separation efficiencies exceeding 98.3% and fluxes ranging from 71.3 to 156.3 L m⁻² h⁻¹ for various oil–water emulsions under gravity-driven conditions. Notably, the membrane maintained exceptional durability through 10 separation cycles, retaining about 98% efficiency while exhibiting strong antifouling properties. Excellent separation performance coupled with facile fabrication protocol and chemical stability of the membrane, position the PVDF@TA/PT membrane as a technologically viable candidate for wastewater purification.

Keywords: superhydrophilicity; tannic acid; pectin; PVDF membrane; oil–water separation

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MDPI and ACS Style

Zhai, L.; Cui, J.; Lu, L.; Wang, H.; Wei, C.; Luo, J.; Xie, A. Preparation of Tannic Acid-Pectin Coated PVDF Membrane for High-Efficiency Separation of Oil and Water Emulsions. Membranes 2025, 15, 155. https://doi.org/10.3390/membranes15050155

AMA Style

Zhai L, Cui J, Lu L, Wang H, Wei C, Luo J, Xie A. Preparation of Tannic Acid-Pectin Coated PVDF Membrane for High-Efficiency Separation of Oil and Water Emulsions. Membranes. 2025; 15(5):155. https://doi.org/10.3390/membranes15050155

Chicago/Turabian Style

Zhai, Liangku, Jiuyun Cui, Lei Lu, Hailong Wang, Can Wei, Jirong Luo, and Atian Xie. 2025. "Preparation of Tannic Acid-Pectin Coated PVDF Membrane for High-Efficiency Separation of Oil and Water Emulsions" Membranes 15, no. 5: 155. https://doi.org/10.3390/membranes15050155

APA Style

Zhai, L., Cui, J., Lu, L., Wang, H., Wei, C., Luo, J., & Xie, A. (2025). Preparation of Tannic Acid-Pectin Coated PVDF Membrane for High-Efficiency Separation of Oil and Water Emulsions. Membranes, 15(5), 155. https://doi.org/10.3390/membranes15050155

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Preparation of Tannic Acid-Pectin Coated PVDF Membrane for High-Efficiency Separation of Oil and Water Emulsions

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