最新文獻：用靜電紡絲合成納米纖維作為凈化水的薄膜

Electrospun PAN–GO composite nanofibers as waterpurification membranes

Author and unit

Jeonghun Lee,1 Jawhan Yoon,1 Jun-Hyun Kim,2 Taegwan Lee,3Hongsik Byun1

1Department of Chemucal Engineering,Keimyung University,Daegu704-701,South Korea

2Department df Chemisty ,lllinois State University,Daegu704-701,South Korea

Correspondence to:H.Byun (E-mail:[email protected])

Journal of Applied polymer science

Joumal Impact Factor：1.86

Year: 2017

Artcleinfo

Received 20 June 2017;accepted 29 September 2017

DOI:10.1002/app.45858

ABSTRACT

Varying amounts of exfoliated graphene oxide (GO) aresystematically incorporated into nanoscale polyacrylonitrile (PAN)fibers via an electrospinning method. Subsequent treatment of thePAN–GO composite nanofibers under a moderate temperature and highpressure leads to the formation of membrane sheets with enhancedmechanical properties. scanning electron microscope, Fouriertransform infrared spectroscopy, and contact angle measurementsconfirm the successful incorporation of the GO into the PANnanofiber membranes whose diameter, porosity, and pore size arenotably influenced by the amount of the GO content. These compositemembranes also exhibit a gradual reduction in the water contactangle as a function of the hydrophilic GO content, resulting in abeneficial property for water purification. In addition, the properintegration of GO into the PAN nanofibers improves the proteinrejection rate and water flux during the filtration process, whichindicates the possibility of utilizing these types of compositemembranes in water treatment systems. © 2017 Wiley Periodicals,Inc. J. Appl. Polym. Sci. 2018, 135, 45858.

Scheme 1.Diagram of the dead-end filtrationapparatus.[Color figure can be viewed atwileyonlinelibrary.com]

Figure 1.Digital photos and contact angles of the barePAN,GO,and hot-press treated PAN-GO composite nanofiber menbranes:(a) bare PAN (10 wt %), (b) PAN-GO （0.1wt %）, (c) PAN-GO (0.2 wt%), (d) PAN-GO (0.3 wt %), and (e) PAN-GO (0.4 wt %）. [Color figurecan be viewed at wileyon-linelibrary.com]

Figure 2. FTIR spectra of the bare GO, bare PAN, andseries of the PAN-GO composite nanofiber menbranes. [Color figurecan be viewed at wilwyonlinelibrary.com]

Figure 3. SEM images of the nanofiber menbranes (top andcross-section views): (a) bare PAN (polymer 10 wt %）, (b) bare PAN(polymer 10.2 wt %), (c) PAN loaded with GO (0.1 wt %) (d) PANloaded with GO (0.2 wt %), (e) PAN loaded with GO (0.3 wt %), and(f) PAN loaded with GO (0.4 wt %）, where the bottom left valne oneach indicates the average diameter of nanofibers.[Color figure canbe viewed at wileyonlinelibrary.com]

Figure 4. Tensile strength of bare PAN and PAN/GOcomposote men-branes. [Color figure can be viewed atwileyonlinelibrary.com]

Figure 5. DI water flux of the bare PAN and PAN/GOcomposite mem- branes. [Color figure can be viewed atwileyonlinelibrary.com]

Figure 6. BSA rejection test using the bare PAN andPAN–GO compos- ite membranes under 0.1 bar pressure and theircorresponding water flux up to ten cycles. [Color figure can beviewed at wileyonlinelibrary. com]

Figure 7. Representative SEM images of the bare PAN andPAN/GO nanofiber composite membranes after the rejection of BSA:(a) PAN 10 wt %,(b)–(e) PAN loaded with GO from0.1 to 0.4 wt %, and (f) cellulose membrane. [Color figure can beviewed at wileyonlinelibrary.com]

Conclusions

The systematic loading of GO into PAN nanofibers was suc-cessfully completed by electrospinning. The subsequent hot- presstreatment allowed for the conversion of composite nanofiber sheetsinto thin membranes whose pore size, thick- ness, and porosity werethoroughly evaluated to understand their integrity as waterpurification filters. A water contact angle of the compositemembranes notably decreased with the increase of the GO content dueto the hydrophilic nature of GO, concomitantly resulting in theincrease of the water flux rate. Lastly, the incorporation of GOinto the PAN nanofiber membranes generally improved theirmechanical properties and also resulted in the significantlysuperior pro- tein rejection than that found with the bare PANmembrane

(e.g., a high purification efficiency). As such, the propermodification of the polymer nanofiber materials with hydro- philicGO materials as fillers can allow for the development of novelcomposite membranes for water purification systems.

近年來，隨著工業化進程的持續加快，紡織、金屬加工等行業造成了嚴重的水污染，導致水體中存在大量的重金屬離子和有機污染物，嚴重影響著人們的生活和自然環境，因此迫切需要開發新型多功能、高附加值的過濾材料來應對水污染挑戰。本期文獻就是說到利用靜電紡絲是一種製造納米纖維的高效技術，靜電紡納米纖維複合過濾材料過濾效率高，相比傳統的過濾材料，靜電紡納米纖維支架具有低克重和高孔隙率、高滲透性以及孔徑可控性，提供了將過濾和吸附的功能結合在一起的平台，可有效去除污染物；利用納米纖維材料作為過濾材料，能顯著提高吸附能力和過濾效率，從而在過濾領域具有重要的應用價值和前景。

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