超亲水-水下超疏油PVDF-g-PAA多孔膜的制备及油水分离性能

doi:10.7503/cjcu20150961

高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (6): 1208.doi: 10.7503/cjcu20150961

超亲水-水下超疏油PVDF-g-PAA多孔膜的制备及油水分离性能

高虹, 段月琴(), 袁志好

天津理工大学材料科学与工程学院, 天津市光电显示材料与器件重点实验室, 天津 300384

收稿日期:2015-12-17 出版日期:2016-06-10 发布日期:2016-05-18
作者简介:联系人简介: 段月琴, 女, 博士, 副研究员, 主要从事特殊润湿性材料表面构建的研究. E-mail:duanyueqin@tjut.edu.cn
基金资助:
国家自然科学基金(批准号: 21171128)资助

Preparation of Superhydrophilic and Underwater Superoleophobic PVDF-g-PAA Porous Membranes and Their Oil-water Separation Performance^†

GAO Hong, DUAN Yueqin^*(), YUAN Zhihao

School of Materials Science and Engineering, Tianjin University of Technology,Tianjin Key Lab for Photoelectric Materials and Devices, Tianjin 300384, China

Received:2015-12-17 Online:2016-06-10 Published:2016-05-18
Contact: DUAN Yueqin E-mail:duanyueqin@tjut.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(No.21171128)

摘要/Abstract

摘要：

采用相反转方法制备了丙烯酸(AA)接枝的超亲水-水下超疏油聚偏氟乙烯膜(PVDF-g-PAA), 通过加入一定量的聚乙烯吡咯烷酮获得可用于油水分离的多孔聚偏氟乙烯膜. 多孔聚偏氟乙烯膜具有较好的抗油污染性能及较高的力学强度, 可以快速高效地分离油水混合体系和乳化油水体系, 分离性质稳定, 多次使用后对油水混合物的分离效率在98%以上, 对油水乳化液的分离效率在91%以上, 可广泛应用于油水混合体系和乳化油水体系的油水分离.

关键词: 超亲水-水下超疏油, 聚偏氟乙烯多孔膜, 油水分离

Abstract:

Traditional polymer membranes used for treating emulsified oil/water mixtures always suffer from low flux, membrane damage and separation efficiency decline, which limit its further application. Here we fabricated a superhydrophilic and underwater superoleophobic poly(vinylidene fluoride)-grafed-poly(acrylic acid)[PVDF-g-PAA] membrane by salt-induced phase inversion method, the saturated sodium chloride solution was used as coagulation bath. In order to improve membrane performance polyvinylprrolidone(PVP) was added as porogen to improve internal structure of the membrane. The result showed that when the content of PVP was 5% the PVDF-g-PAA membrane could be used to separate both simple oil/water mixture and oil in water emulsion, the separation efficiency of oil in water emulsion still reaches 91% after several times and the flux maintained at 444 L/(m² · h) or more. Also the membrane exhibits an excellent antifouling property and is easily recycled for long-term use. The outstanding performance of the membrane and the efficient, energy and cost-effective preparation process highlight its potential for practical applications.

Key words: Superhydrophilic and underwater superoleophobic, Poly(vinylidene fluoride)-grafed-poly(acry-lic acid) membrane, Oil-water separation

中图分类号:

O632.51

TrendMD:

高虹, 段月琴, 袁志好. 超亲水-水下超疏油PVDF-g-PAA多孔膜的制备及油水分离性能. 高等学校化学学报, 2016, 37(6): 1208.

GAO Hong, DUAN Yueqin, YUAN Zhihao. Preparation of Superhydrophilic and Underwater Superoleophobic PVDF-g-PAA Porous Membranes and Their Oil-water Separation Performance^†. Chem. J. Chinese Universities, 2016, 37(6): 1208.

图/表 11

Scheme 1 Surface modification of PVDF membrane(A) and surface grafting of PVDF membrane(B)

Fig.1 SEM image(A) and contact angle(B) of cross section of original PVDF membrane

Fig.2 Change of contact angle after the water droplet contact with the surface of PVDF-g-PAA membraneTime/s: (A) 0; (B) 7.5; (C) 15; (D) 22.5; (E) 30; (F) 37.5; (G) 45.Contact angle/(°): (A) 41.4; (B) 32.5; (C) 25.9; (D) 24.6; (E) 23.8; (F) 16.1; (G) 0.

Fig.3 SEM images of PVDF(A, B) and PVDF-g-PAA membranes(C, D)(A) Top surface of PVDF membrane; (B) bottom surface of PVDF membrane; (C) top surface of PVDF-g-PAA membrane;(D) bottom surface of PVDF-g-PAA membrane.

Fig.4 SEM images of top surface of PVDF-g-PAA membrane with different component contents of PVPw(PVP)(%): (A) 0; (B) 2; (C) 5; (D) 10; (E) 15; (F) 20.

Fig.5 SEM images of cross section of PVDF-g-PAA membrane with different component contents of PVPw(PVP)(%): (A) 0; (B) 2; (C) 5; (D) 10; (E) 15; (F) 20.

Table 1 Separation efficiency of oil-water emulsion

w(PVP)(%)	Separation efficiency(%)
w(PVP)(%)	First time	Second time	Third time	Forth time	Fifth time
0	98	96	87	83	77
2	96	96	89	81	78
5	95	93	92	91	91
10	84	81	80	77	75
15	77	76	75	74	72
20	72	71	69	67	66

Fig.6 Photoimage of particle size of oil/water emulsion system

Scheme 2 Possible mechanism of O/W emulsion separation by PVDF-g-PAA membrane

Fig.7 Flux of PVDF-g-PAA membrane with different component of PVP

Fig.8 Mechanical property of PVDF-g-PAA membrane with different component of PVP

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超亲水-水下超疏油PVDF-g-PAA多孔膜的制备及油水分离性能

Preparation of Superhydrophilic and Underwater Superoleophobic PVDF-g-PAA Porous Membranes and Their Oil-water Separation Performance^†

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超亲水-水下超疏油PVDF-g-PAA多孔膜的制备及油水分离性能

Preparation of Superhydrophilic and Underwater Superoleophobic PVDF-g-PAA Porous Membranes and Their Oil-water Separation Performance†

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Preparation of Superhydrophilic and Underwater Superoleophobic PVDF-g-PAA Porous Membranes and Their Oil-water Separation Performance^†