Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (10): 42-47.doi: 10.13475/j.fzxb.20180908106

• Fiber Materials • Previous Articles     Next Articles

Preparation of porous ZnO films by coaxial electrospinning and photocatalytic performance thereof

XIN Minyue, ZHENG Qiang, WU Jiangdan, LIANG Liefeng()   

  1. College of Textile and Garment, Southwest University, Chongqing 400715, China
  • Received:2018-09-28 Revised:2019-07-17 Online:2019-10-15 Published:2019-10-23
  • Contact: LIANG Liefeng E-mail:2544128281@qq.com

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Abstract:

In order to prepare light photocatalysts with large specific surface area, aiming at the problem that most of polymer carriers in electrospinning are polluted and non-renewable, ZnAc/silk fibroin(SF) nanofiber films were prepared by coaxial electrospinning using silk fibroin as carrier, and then ZnAc/SF nanofiber films were immersed in Na2S solution to prepare ZnS/SF nanofiber films. Finally, porous ZnO films were obtained by calcination. The structure, element composition, surface morphology and optical properties of the samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Scanning electron microscope and UV-Vis absorption spectra. Besides, the photocatalytic performance of samples were studied by MB degrading tests. The results show that the porous ZnO film is a mesoporous network composed of 10-20 nm nanoparticles with the capability of absorbing ultraviolet light. The film is stronger in photocatalytic activity than the ZnS/C nanofiber film, and has the degradation efficiency of methylene blue up to 99.5%. In addition, porous ZnO films can be easily recycled and reused, and the degradation efficiency reaches 91% after four cycles.

Key words: dyeing waste water, porous ZnO film, coaxial electrospinning, photocatalytic property, recycling

CLC Number: 

  • TQ340.64

Fig.1

SEM images of samples. (a) ZnAc/SF nanofiber films;(b) ZnS/SF nanofiber films; (c) ZnS/C nanofiber films; (d) Porous ZnO films"

Fig.2

TEM images of porous ZnO films. (a) TEM image; (b) HRTEM image;(c) SAED image"

Fig.3

XPS spectra of samples. (a) Overall XPS spectra of ZnS/SF nanofiber films, ZnS/C nanofiber films and porous ZnO films; (b) High resolution O1s XPS spectra of porous ZnO films"

Fig.4

UV-visible spectra of samples"

Fig.5

XRD patterns of samples. (a) SF nanofiber films and ZnAC/SF nanofiber films; (b) ZnS/SF nanofiber films, ZnS/C nanofiber films and porous ZnO films"

Fig.6

UV-vis spectra of self-degradation of MB"

Fig.7

UV-vis spectra of MB under different conditions. (a) Degradation of MB by porous ZnO films in dark box; (b) Degradation of MB by ZnS/C nanofiber mats in dark box; (c) Photodegradation of MB by porous ZnO films under ultraviolet light irradiation; (d) Photodegradation of MB by ZnS/C nanofiber mats under ultraviolet light irradiation"

Fig.8

UV-vis spectra of MB photodegraded by porous ZnO films for recycling 2 (a) and 4(b) times"

Fig.9

UV-vis spectra of photodegradation of printing and dyeing wastewater by porous ZnO films"

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