Photocatalytic degradation of textile dye direct orange 26 by using CoFe2O4/Ag2O

Document Type: Research Paper


1 Faculty of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan, 35131-19111, Iran

2 Faculty of Chemical, Petroleum and Gas Engineering, Semnan University, Semnan, 35131-19111, Iran.


The magnetic and recyclable nanoparticles of CoFe2O4 were synthesized by a reverse co-precipitation process. Sonication was used to couple the CoFe2O4 surface with Ag2O. The characteristics and optical properties of the catalyst were studied by powder X-ray diffraction, UV–visible reflectance spectroscopy and scanning electron microscopy analyses. Pure CoFe2O4 and CoFe2O4/Ag2O were utilized to determine the visible light photocatalytic degradation of Direct Orange 26. The effects of pH, the initial concentration of catalyst and initial dye concentration on the photocatalytic process were investigated. It was found that the presence of Ag2O remarkably improved the photocatalytic adsorption capacity and degradation efficiency of CoFe2O/Ag2O when compared with the pure CoFe2O4. Moreover, due to the magnetic behavior of CoFe2O4, these coupled nanoparticles can be easily separated from the aqueous solution by applying an external magnetic field. The prepared Ag2O-modified CoFe2O4 exhibited much higher (about 40%) photocatalytic activity than the unmodified one. The results showed that the loading of the Ag2O significantly improved the photocatalytic performance of the CoFe2O4 in which the Ag2O acted as a charge carrier to capture the delocalized electrons.


Main Subjects

[1] Habibi, M. H., Parhizkar, J. (2015). Cobalt ferrite nano-composite coated on glass by Doctor Blade method for photo-catalytic degradation of an azo textile dye Reactive Red 4: XRD, FESEM and DRS investigations. Spectrochimica acta part A: Molecular and biomolecular spectroscopy, 150, 879-885.

[2] Bhukal, S., Singhal, S. (2014). Magnetically separable copper substituted cobalt–zinc nano-ferrite photocatalyst with enhanced photocatalytic activity.Materials science in semiconductor processing, 26, 467-476.

[3] Mishra, D., Senapati, K. K., Borgohain, C., Perumal, A. (2012). CoFe2O4− Fe3O4 Magnetic nanocomposites as photocatalyst for the degradation of methyl orange dye. Journal of nanotechnology, 1, 1-6.

[4] Mourão, H. A., Malagutti, A. R., Ribeiro, C. (2010). Synthesis of TiO2-coated CoFe2O4 photocatalysts applied to the photodegradation of atrazine and rhodamine B in water. Applied catalysis A: General, 382(2), 284-292.

[5] Hong, Y., Ren, A., Jiang, Y., He, J., Xiao, L., Shi, W. (2015). Sol–gel synthesis of visible-light-driven Ni(1− x) Cu(x) Fe2O4 photocatalysts for degradation of tetracycline. Ceramics international, 41(1), 1477-1486.

[6] Amir, M., Kurtan, U., Baykal, A. (2015). Rapid color degradation of organic dyes by Fe3O4@His Ag recyclable magnetic nanocatalyst. Journal of industrial and engineering Chemistry, 27, 347-353.

[7] Chen, F., Liu, Z., Liu, Y., Fang, P., Dai, Y. (2013). Enhanced adsorption and photocatalytic degradation of high-concentration methylene blue on Ag 2 O-modified TiO2-based nanosheet. Chemical engineering journal, 221, 283-291.

[8] Singh, S., Khare, N. (2015). Magnetically separable, CoFe2O4 decorated CdS nanorods for enhanced visible light driven photocatalytic activity. Materials letters, 161, 64-67.

[9] Huixia, F., Baiyi, C., Deyi, Z., Jianqiang, Z., Lin, T. (2014). Preparation and characterization of the cobalt ferrite nano-particles by reverse coprecipitation. Journal of magnetism and magnetic materials, 356, 68-72.

[10] Alexander, L., Klug, H. P. (1950). Determination of crystallite size with the X‐Ray spectrometer. Journal of applied physics, 21(2), 137-142.

[11] Yu, H., Liu, R., Wang, X., Wang, P., Yu, J. (2012). Enhanced visible-light photocatalytic activity of Bi 2 WO 6 nanoparticles by Ag2O cocatalyst. Applied catalysis B: Environmental, 111, 326-333.

[12] Wang, H., Li, J., Huo, P., Yan, Y., Guan, Q. (2016). Preparation of Ag2O/Ag2CO3/MWNTs composite photocatalysts for enhancement of ciprofloxacin degradation. Applied surface science, 366, 1-8.

[13] You, Y., Wan, L., Zhang, S., Xu, D. (2010). Effect of different doping methods on microstructure and photo-catalytic activity of Ag2O–TiO2 nanofibers. Materials research bulletin, 45(12), 1850-1854.

[14] Shi, B. N., Wan, J. F., Liu, C. T., Yu, X. J., Ma, F. W. (2015). Synthesis of CoFe2O4/MCM-41/TiO2 composite microspheres and its performance in degradation of phenol. Materials science in semiconductor processing, 37, 241-249.

[15] Sathishkumar, P., Mangalaraja, R. V., Anandan, S., Ashokkumar, M. (2013).CoFe2O4/TiO2 nanocatalysts for the photocatalytic degradation of Reactive Red 120 in aqueous solutions in the presence and absence of electron acceptors. Chemical engineering journal, 220, 302-310.

[16] Harraz, F. A., Mohamed, R. M., Rashad, M. M., Wang, Y. C., Sigmund, W. (2014). Magnetic nanocomposite based on titania–silica/cobalt ferrite for photocatalytic degradation of methylene blue dye. Ceramics international, 40(1), 375-384.

[17] Shi, B. N., Wan, J. F., Liu, C. T., Yu, X. J., Ma, F. W. (2015). Synthesis of CoFe2O4/MCM-41/TiO2 composite microspheres and its performance in degradation of phenol. Materials science in semiconductor processing, 37, 241-249.

[18] Gan, L., Shang, S., Yuen, C. W. M., Jiang, S. X., Hu, E. (2015). Hydrothermal synthesis of magnetic CoFe2O4/graphene nanocomposites with improved photocatalytic activity. Applied surface science, 351, 140-147.[19] Ma, J., Yang, M., Sun, Y., Li, C., Li, Q., Gao, F, Chen, J. (2014). Fabrication of Ag/TiO2 nanotube array with enhanced photo-catalytic degradation of aqueous organic pollutant. Physica E: Low-dimensional systems and nanostructures, 58, 24-29.

[20] Munter, R. (2001). Advanced oxidation processes–current status and prospects. Proceedings of the Estonian academy of sciences. Chemistry, 50(2), 59-80.

[21] Yavari, S., Mahmodi, N. M., Teymouri, P., Shahmoradi, B., Maleki, A. (2016). Cobalt ferrite nanoparticles: Preparation, characterization and anionic dye removal capability. Journal of the Taiwan institute of chemical engineers, 59, 320-329.