Photo-catalytic properties of doped or substituted polyaniline-coated Fe3O4 nanoparticles

Fan Zhang, Weijie Song, Zongshan Zhao, Yang Cheng

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Abstract: In this work, doped and substituted polyaniline (PANI)-coated Fe3O4 nanoparticles were synthesized. The diameter of Fe3O4 core was ~430 nm, and the thickness of PANI shell was ~20 nm. Their photo-catalytic properties for methyl orange were investigated under natural light illumination. The photo-catalytic activity sequence of three doped PANI/Fe3O4 nanoparticles is as follows: iodine doping > without doping > graphite powder doping. This should be due to the difference of structure, conductivity, and band gap resulting from the dopants. The photo-catalytic activity of five substituted PANI/Fe3O4 nanoparticles followed the order of poly(1,2-diaminobenzene) > poly(o-toluidine) > poly(1,3-diaminobenzene) > PANI > polydiphenylamine. The effects of steric hindrance, activated ability, and conjugation of the substituents on the photo-catalytic properties were discussed. The ESR results suggested that O2 and H2O2 dissolved in the solutions were important factors on the photo-degradation, and the ·OH generated via h+-mediated pathway was the key oxidizing substance.

Graphical Abstract: [Figure not available: see fulltext.]

Original languageEnglish (US)
Article number2666
JournalJournal of Nanoparticle Research
Issue number10
StatePublished - Oct 2014

Bibliographical note

Funding Information:
Acknowledgments This work was financially supported by the Youth Science and Technology Innovation Fund of College of Science, Nanjing Agricultural University, the Youth Fund of Nanjing Agricultural University, and National Natural Science Funds of China (Grant No. 51402153).


  • Core/shell
  • Dopant
  • Magnetic nanoparticles
  • Photo-catalytic activity
  • Substituent


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