Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (10): 97-105.doi: 10.13475/j.fzxb.20220408509

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Fabrication and photocatalyic performance of Bi2MoO6 modified TiO2 nanorod array photocatalyst

ZHOU Xiaoju, HU Zhenglong(), REN Yiming, XIE Landong   

  1. School of Electronic and Information Engineering, Hubei University of Science and Technology,Xianning, Hubei 437100, China
  • Received:2022-04-27 Revised:2022-07-15 Online:2022-10-15 Published:2022-10-28
  • Contact: HU Zhenglong E-mail:huzhenglong@hbust.edu.cn

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Abstract:

In order to obtain a recyclable photocatalyst for efficient degradation of organic pollutants under visible light, TiO2 nanorod arrays were modified with Bi2MoO6 nanosheets by hydrothermal solvothermal two-step method to obtain Bi2MoO6/TiO2 composite. The morphology, structure, chemical element composition and optical properties of Bi2MoO6/TiO2 photocatalyst were analyzed, and the photoelectrochemical and photocatalytic properties of Bi2MoO6/TiO2 photocatalyst were tested with the help of electrochemical workstation in order to analyze the mechanism of enhanced photocatalytic activity. The results show that modification of TiO2 nanorod arrays by Bi2MoO6 with narrow gap broadens the spectral response range, promotes the effective separation and transfer of photogenerated carriers, and obtains significantly enhanced photocatalytic degradation efficiency of methylene blue. The energy band structure diagram shows that type II heterojunction is formed between TiO2 and Bi2MoO6, which promotes the separation and transfer of photogenerated electron holes. The synergistic effect between type II band structure of Bi2MoO6/TiO2 and the extended absorption of visible light is the internal mechanism for the improvement of photocatalytic properties.

Key words: printing and dyeing wastewater treatment, photocatalytic biodegradation, photo-degradation mechanism, solvothermal method, visible light catalyst

CLC Number: 

  • O649.4

Fig.1

XRD patterns of pristine TiO2/FTO, Bi2MoO6 and Bi2MoO6/TiO2 composites"

Fig.2

SEM images of pristine TiO2 anorod arrays (a), pure Bi2MoO6nanosheets (b), and Bi2MoO6/TiO2 composites(c)"

Fig.3

N2 adsorption-desorption isotherms(a), and pore volume curves(b) of TiO2, Bi2MoO6 and Bi2MoO6/TiO2 composites"

Fig.4

TEM images of TiO2 (a), Bi2MoO6(b), Bi2MoO6/TiO2(c), and HRTEM images of Bi2MoO6/TiO2 composites(d)"

Fig.5

XPS spectra of Bi2MoO6/TiO2 phtocatalytist. (a) Survey spectra; (b) Bi4f spectra; (c) Mo3d spectra;(d) Ti2p spectra; (e) O1s spectra"

Fig.6

UV-Vis absorption spectra(a) and band gap(b) of TiO2, Bi2MoO6, and Bi2MoO6/TiO2"

Fig.7

PL spectra of TiO2, Bi2MoO6, and Bi2MoO6/TiO2"

Fig.8

J-V curves(a), and photoconversion efficiencies(b) of TiO2, Bi2MoO6 and Bi2MoO6/TiO2heterostructrures"

Fig.9

Transient photocurrent response (a), and Nyquist plots of TiO2, Bi2MoO6 and Bi2MoO6/TiO2 heterostructrures (b)"

Fig.10

Mott-Schottky plots of pristine TiO2 and Bi2MoO6"

Fig.11

Photocatalytic degradation curve of Bi2MoO6/TiO2 heterostructures. (a)Photocatalytic degradation curve of methylene blue; (b)Repeated photocatalytic degradation activity of Bi2MoO6/TiO2; (c)Degradation effect of Bi2MoO6/TiO2 on methyl orange and methylene blue"

Fig.12

ESR signals of ·OH (a), and · O 2 - radicals(b) of Bi2MoO6/TiO2 photocatalysts"

Fig.13

Band structures of Bi2MoO6/TiO2 heterostructures and photocatalytic mechanism of organic dye degradation"

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