Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (12): 94-101.doi: 10.13475/j.fzxb.20200305008

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Catalytic degradation of dye by metal phthalocyanine/multi-walled carbon nanotubes under simulated solar light

XIA Yun, LÜ Wangyang, CHEN Wenxing()   

  1. National Engineering Laboratory for Textile Fiber Materials & Processing Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2020-03-19 Revised:2020-06-24 Online:2020-12-15 Published:2020-12-23
  • Contact: CHEN Wenxing E-mail:wxchen@zstu.edu.cn

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Abstract:

In order to expand the pH value of the Fenton system to degrade dye efficiently, the catalyst FePcCl16/multi-walled carbon nanotubes (FePcCl16/MWCNTs), synthesized by means of FePcCl16 loaded on MWCNTs via reflux with H2O2 as oxidant, was employed to degrade Acid Orange 7 dye (AO7) under simulated solar light irradiation. The catalytic performance, influencing factors and catalytic mechanism of the catalytic system were characterized by scanning electron microscope, transmission electron microscope, Fourier transform infrared spectrometer, thermogravimetric analyzer and X-ray diffractomer. The results show that the degradation rate of AO7 is 100% under acidic, inorganic salts and urea conditions in catalytic system, 97% under the neutral condition, and 75% under the alkaline condition. The degradation rate of AO7 is still above 95% after 5 cycles of the catalytic system. The results of catalytic mechanism show that the main active species of AO7 degradation in the catalytic system are hydroxyl radicals and superoxide radicals. Solar light irradiation promotes the production of active species to improve the catalytic performance of the system.

Key words: simulated solar light, metal phthalocyanine, multi-walled carbon nanotube, catalytic degradation, Acid Orange 7 dye, Fenton-like system, wastewater treatment

CLC Number: 

  • O643.32

Fig.1

Microstructure of FePcCl16/MWCNTs. (a) SEM image(×20 000); (b) TEM image (×600 000)"

Fig.2

FT-IR spectra of MWCNTs, FePcCl16 and FePcCl16/MWCNTs"

Fig.3

Thermal stability of MWCNTs, FePcCl16 and FePcCl16/MWCNTs"

Fig.4

XRD patterns of MWCNTs, FePcCl16 and FePcCl16/MWCNTs"

Fig.5

Catalytic activity of different catalytic system on dye A07"

Fig.6

Absorbance of AO7 in FePcCl16/MWCNTs/H2O2 system"

Fig.7

Effect of solar light irradiation on FePcCl16/MWCNTs/H2O2 catalytic activity"

Fig.8

Effect of hydrogen peroxide concentration on FePcCl16/MWCNTs/H2O2 catalytic activity"

Fig.9

Effect of pH values on FePcCl16/MWCNTs/H2O2 catalytic activity"

Fig.10

Effect of inorganic salts and urea on FePcCl16/MWCNTs/H2O2 catalytic activity"

Fig.11

Cyclic performance of FePcCl16/MWCNTs/H2O2"

Fig.12

Effect of IPA and p-BQ on FePcCl16/MWCNTs/H2O2 catalytic activity"

Fig.13

DMPO spin-trapping EPR signal of radicals. (a) Hydroxyl radical; (b) Superoxide radical"

Fig.14

Route of producing active species"

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