Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (06): 37-43.doi: 10.13475/j.fzxb.20210504507

• Fiber Materials • Previous Articles     Next Articles

Construction of air-liquid-solid tri-phase system from bilayer micro/nanofiber membrane and its photocatalytic performance

FEI Jianwu1, LÜ Mingze1, LIU Liwei2, WANG Chunhong1, HAN Zhenbang1()   

  1. 1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
    2. Tianjin Yuanda Industry and Trade Co., Ltd., Tianjin 301600, China
  • Received:2021-05-19 Revised:2021-12-28 Online:2022-06-15 Published:2022-07-15
  • Contact: HAN Zhenbang E-mail:hanzhenbang@tiangong.edu.cn

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Abstract:

To enhance the photocatalytic degradation performance of the graphitic carbon nitride (g-C3N4), a bilayer micro/nanofiber membrane with opposing wettability has been developed via the electrospinning method, where the polystyrene membrane was used as the hydrophobic layer, and the g-C3N4/iron (II) phthalocyanine (FePc) heterojunction was taken for the hydrophilic layer on a polyacrylonitrile/polyvinylpyrrolidone membrane substrate. The morphology, chemical construction and optical absorption of the prepared bilayer membrane were investigated, and the photocatalytic performance for dye degradation was studied. The results indicate that the hydrophobic layer and the hydrophilic catalyst layer, with the water contact angle of 140° and 12°, respectively, can be tightly combined with each other. The distribution of g-C3N4/FePc on the catalyst layer is uniform, and the sensitization of FePc extends the optical absorption up to 800 nm. During the photocatalytic dye degradation, the hydrophobic layer can serve as gas passage to quickly deliver O2 from air to the catalytic interface. This greatly boosts the capture of photoelectrons in conduction band of g-C3N4 by O2 via constructing an air-liquid-solid triphase contact interface, resulting in 3.1 times fold higher reaction kinetics versus a normal diphase system.

Key words: micro-nanofiber membrane, carbon nitride, tri-phase system, photocatalytic performance, dye degradation

CLC Number: 

  • TQ619.2

Fig.1

SEM images and EDAX mappings of CN/FePc-PP/PS. (a) Hydrophobic PS layer; (b) Hydrophilic catalyst layer;(c) Cross section; (d) C distribution; (e) N distribution;(f) Fe distribution"

Fig.2

FT-IR spectra of fiber membrane samples"

Fig.3

XPS spectra of fiber membrane samples. (a) Wide-scan spectra; (b) C1s spectra; (c) N1s spectra; (d) Fe2p spectra"

Fig.4

XRD patterns of fiber membrane samples"

Fig.5

UV-Vis diffuse reflectance absorption spectra of fiber membrane samples"

Fig.6

PL spectra of fiber membrane samples"

Fig.7

Degradation curves of RhB over CN/FePc-PP/PS under different conditions"

Fig.8

Mechanism of air-liquid-solid tri-phase system"

Fig.9

Recyclability of CN/FePc-PP/PS for RhB degradation under visible light irradiation"

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