Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (09): 149-155.doi: 10.13475/j.fzxb.20210705507

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation of modified polyacrylonitrile fiber supported MoSx/TiO2 composite photocatalyst and its performance for dye degradation

YANG Li, WANG Tao, SHI Xianbing, HAN Zhenbang()   

  1. School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China
  • Received:2021-07-19 Revised:2022-06-19 Online:2022-09-15 Published:2022-09-26
  • Contact: HAN Zhenbang E-mail:hanzhenbang@tiangong.edu.cn

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Abstract:

To improve the photocatalytic performance of MoSx/TiO2 heterojunction, amorphous MoSx was anchored onto amidoximated polyacrylonitrile (PAN) fiber via an adsorption and in-situ transformation method, and then TiO2 was immobilized onto the fibrous support in order to synthesize a composite photocatalyst. The morphology, chemical structure and optical property of the photocatalyst were investigated, and its photocatalytic performance on the oxidation of dye wastewater was evaluated under visible light irradiation. The results show that MoSx and TiO2 can be uniformly distributed onto the fibrous surface, and the MoSx significantly enhances the light absorption of the photocatalyst. The as-prepared photocatalyst could achieve the fast oxidative degradation of the dye wastewater under light irradiation with wavelength greater than 500 nm, resulting in a 4.7-fold higher reaction kinetics versus the reaction system over single TiO2 supported fibrous photocatalyst. In addition, the photocatalyst exhibited high recycling ability for dye degradation. This high photocatalytic activity mainly originates from the enhanced adsorption performance towards pollutants by MoSx, as well as the sensitization effect of MoSx to TiO2 under visible light irradiation.

Key words: MoSx, TiO2, modified polyacrylonitrile fiber, photocatalysis, dye degradation, dye wastewater, wastewater treatment

CLC Number: 

  • TQ619.2

Tab.1

Metal content of various MoSx/TiO2-PAN samples"

样品名称 溶液中浓度/
(mol·L-1)		 催化剂中含量/
(mg·g-1)		 C M o S x∶
C T i O 2
Mo S 4 2 - TiO2 CMoSx C T i O 2
TiO2-PAN 0 0.094 0 85.6 —
MoSx/TiO2-PAN1 0.012 0.094 3.9 75.8 0.05∶1
MoSx/TiO2-PAN2 0.018 0.094 6.8 73.9 0.09∶1
MoSx/TiO2-PAN3 0.024 0.094 9.6 73.6 0.13∶1
MoSx/TiO2-PAN4 0.030 0.094 12.5 71.8 0.17∶1

Fig.1

SEM image and EDAX maps of MoSx/TiO2-PAN3. (a) SEM image; (b) EDAX map of Ti element; (c) EDAX map of Mo element; (d) EDAX map of S element"

Fig.2

FT-IR spectra of AO-PAN and MoSx/TiO2-PAN3 samples"

Fig.3

XPS spectra of MoSx/TiO2-PAN3 samples. (a) Wide scan spectra; (b) Ti 2p spectra; (c) Mo 3d spectra; (d) S 2p spectra"

Fig.4

UV-Vis diffuse reflectance absorption spectra of different MoSx/TiO2-PAN samples"

Fig.5

Photocatalytic degradation curves of RhB of different MoSx/TiO2-PAN samples"

Tab.2

k values of photocatalytic degradation of RhB and adsorption removal under dark conditions of different MoSx/TiO2-PAN samples"

样品名称 k/min-1 降解率/%
TiO2-PAN 0.006 17.6
MoSx/TiO2-PAN1 0.010 23.3
MoSx/TiO2-PAN2 0.022 25.1
MoSx/TiO2-PAN3 0.028 26.6
MoSx/TiO2-PAN4 0.011 27.3

Fig.6

PL spectra of MoSx-PAN and MoSx/TiO2-PAN samples"

Fig.7

Effect of scavengers on photocatalytic degradation rate of RhB with MoSx/TiO2-PAN3"

Fig.8

Effect of solution pH values on photocatalytic degradation rate of RhB with MoSx/TiO2-PAN3"

Fig.9

Recyclability of MoSx/TiO2-PAN3 for dye degradation"

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