Polyethylene glycol-assisted sol-gel synthesis of magnetic CoFe2O4 powder as photo-Fenton catalysts in the presence of oxalic acid
- 58 Downloads
The aim of the study was to prepare magnetic photo-Fenton catalysts based on CoFe2O4 by polyethylene glycol-assisted sol-gel method for the degradation of methylene blue under UVA and visible light irradiation with H2C2O4 as a radical producing source. The catalysts were synthesized at different annealing temperatures in order to investigate the influence of annealing temperature on their crystal structure, morphology, surface functional groups, magnetic properties, and their photo-Fenton catalytic activity. According to the results, when the annealing temperature increased from 600 to 800 °C, the content of CoFe2O4 cubic spinel phase was significantly enhanced, the amount of Fe3+ ions in the tetrahedral sites also increased on the surface of samples, which improved the magnetic properties as well as the photo-Fenton catalytic performance under both UVA and visible light. However, at the annealing temperature of 900 °C, the photo-Fenton activity was declined, which can be attributed to the growth of catalytic particles and the decrease of Fe3+ ions on their surface.
Preparation of CoFe2O4 catalysts by polyethylene glycol-assisted sol-gel method.
Increasing of annealing temperature improves the CoFe2O4 phase content.
The Fe3+ ions in surface tetrahedral sites increases with annealing temperature.
Enhanced CoFe2O4 phase and surface Fe3+ contents improve the photo-Fenton activity.
H2C2O4 plays as an efficient radical source for the photo-Fenton catalysis.
KeywordsPolyethylene glycol-assisted sol-gel method CoFe2O4 Magnetic powder Photo-Fenton catalysis H2C2O4
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 15.Anchieta CG, Severo EC, Rigo C, Mazutti MA, Kuhn RC, Muller EI, Flores EMM, Moreira RFPM, Foletto EL (2015) Rapid and facile preparation of zinc ferrite (ZnFe2O4) oxide by microwave-solvothermal technique and its catalytic activity in heterogeneous photo-Fenton reaction. Mater Chem Phys 160:141–147CrossRefGoogle Scholar
- 27.Rodriguez-Carvajal J (2001) Commission of powder diffraction. IUCr Newsl 26:12–19Google Scholar
- 31.Sahoo SK, Agarwal K, Singh AK, Polke BG, Raha KC (2010) Characterization of γ- and α-Fe2O3 nano powders synthesized by emulsion precipitation-calcination route and rheological behaviour of α-Fe2O3. Int J Eng Sci Tech 2:118–126Google Scholar
- 34.Šolek P (2009) Techincká Mechanika II, 1st edn. Slovenská technická univerzita v Bratislave, Nakladatel’stvo STU, Bratislava (Technical Mechanics II) in Slovak language.Google Scholar
- 40.Dean JA (1998) Lange’s handbook of chemistry. The McGraw-Hill Companies 15th ed:8.98.Google Scholar