膜科学与技术

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Preparation and properties of superhydrophilic/underwater
superoleophobic TA/PVP/CNT membranes

Authors： QIU Chunxia, DONG Xin, LIU Yu, XU Yuanlu，FAN Xinfei, SONG Chengwen

Units： 1. Transport Planning and Research Institute Ministry of Transport, Beijing 100028, China; 2. School of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, China; 3. Guotou Caofeidian Port Co., Ltd., Tangshan 063200, China

KeyWords： superhydrophilic/underwater superoleophobic; carbon nanotubes; efficient oil-water mixtures separation

ClassificationCode：R136.3+3； TQ320.72+1

year,volume(issue):pagination： 2025,45(5):86-99

Abstract：

Oily wastewater discharged from various industrial activities poses a serious threat to the ecological environment and human health. Membrane separation is widely used in the treatment of oily wastewater due to its advantages of simple operation, low energy consumption and high selectivity. In this paper, carbon nanotube (CNT) was deposited on cellulose acetate (CA-CN) membranes to construct nanoscale pores, and tannic acid (TA) and polyvinylpyrrolidone (PVP) were introduced to form a hydrogel layer, preparing a nanorough-structured superhydrophilic/underwater superoleophobic TA/PVP/CNT composite membrane. This composite membrane exhibited excellent superhydrophilic/underwater superoleophobic properties, capable of efficiently separating various oil-water mixtures and oil-in-water emulsions stabilized by surfactants (such as n-hexane, edible oil, cetane, liquid paraffin, isooctane), with a separation efficiency of up to 99.61%. Furthermore, after 10 cycles of oil-in-water emulsion filtration, the separation performance of this composite membrane remained at a high level, which indicates that the TA/PVP/CNT composite membrane has good stability and anti-pollution ability during long-term use. The TA/PVP/CNT composite membrane demonstrates superior separation performance and a green and environmentally friendly preparation method, indicating broad application prospects in the field of oily wastewater treatment.

Funds：

国家重点研发计划项目（2023YFC3108300）

AuthorIntro：

邱春霞（1979-），女，辽宁东港人，硕士研究生，主要研究方向为油污水膜分离技术

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