Photocatalytic decolorization of methyl orange dye using nano-photocatalysts

Document Type: Research Paper

Author

wastewater

Abstract

Environmental contamination, which is growing around the world, is a serious problem can not to be neglected. Among all contaminations, water pollution is a major problem. Azo dyes are one of the largest groups of pollutants found in the drinking water, coming from, and the food and textile industries. TiO2/Fe3O4 and TiO2/Fe2O3 nanocomposites with various ratios were synthesized by an ultrasonic-assisted deposition-precipitation method and their UV-light decolorization of methyl orange (MO) dye was investigated. The effect of Fe3O4/TiO2 and Fe2O3-TiO2 nanocomposites ratio on the photocatalytic activity and magnetic property of the nanocomposites was studied by comparing their decolorization curves and magnetism in the presence of magnet, respectively. The results revealed that the decolorization efficiency of 1 wt% Fe3O4/TiO2 nanocomposite reached about 40% within 60 min UV irradiation at room temperature. However, this sample showed the least magnetism. Also, the ability of synthesized nanocomposites in holding the adsorbed methyl orange dye on their surface and the effect of pH were investigated.

Keywords

Main Subjects


[1] Richman, M. I. N. D. (1997). Industrial water pollution. Wastewater, 5(2), 24-29.

[2] Firooz, A. A., Mahjoub, A. R., Khodadadi, A. A., Movahedi, M. (2010). High photocatalytic activity of Zn2SnO4 among various nanostructures of Zn2xSn1−x O2 prepared by a hydrothermal method. Chemical engineering journal, 165(2), 735-739.

[3] Parsaie, A., Haghiabi, A. H. (2015). Predicting the longitudinal dispersion coefficient by radial basis function neural network. Modeling earth systems and environment, 1(4), 1-8.

[4] Parsaie, A., Haghiabi, A. H. (2015). Computational modeling of pollution transmission in rivers. Applied water science, 1-10.

[5] Pare, B., Jonnalagadda, S. B., Tomar, H., Singh, P., Bhagwat, V. W. (2008). ZnO assisted photocatalytic degradation of acridine orange in aqueous solution using visible irradiation. Desalination, 232(1), 80-90.

[6] Yassıtepe, E., Yatmaz, H. C., Öztürk, C., Öztürk, K., Duran, C. (2008). Photocatalytic efficiency of ZnO plates in degradation of azo dye solutions. Journal of photochemistry and photobiology A: Chemistry, 198(1), 1-6.

[7] Kong, J. Z., Li, A. D., Li, X. Y., Zhai, H. F., Zhang, W. Q., Gong, Y. P., Wu, D. (2010). Photo-degradation of methylene blue using Ta-doped ZnO nanoparticle. Journal of solid state chemistry, 183(6), 1359-1364.

[8] Cozzoli, P. D., Kornowski, A., Weller, H. (2003). Low-temperature synthesis of soluble and processable organic-capped anatase TiO2 nanorods. Journal of the American chemical society, 125(47), 14539-14548.

[9] Jun, Y. W., Jung, Y. Y., Cheon, J. (2002). Architectural control of magnetic semiconductor nanocrystals. Journal of the American chemical society, 124(4), 615-619.

[10] Rao, A. R., Dutta, V. (2007). Low-temperature synthesis of TiO2 nanoparticles and preparation of TiO2 thin films by spray deposition. Solar energy materials and solar cells, 91(12), 1075-1080.

[11] Guettai, N., Amar, H. A. (2005). Photocatalytic oxidation of methyl orange in presence of titanium dioxide in aqueous suspension. Part I: Parametric study. Desalination, 185(1), 427-437.

[12] Herrmann, J. M. (1999). Heterogeneous photocatalysis: fundamentals and applications to the removal of various types of aqueous pollutants. Catalysis today, 53(1), 115-129.

[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] Dong, X. L., Mou, X. Y., Ma, H. C., Zhang, X. X., Zhang, X. F., Sun, W. J., Xue, M. (2013). Preparation of CdS–TiO2/Fe3O4 photocatalyst and its photocatalytic properties. Journal of Sol-Gel science and technology, 66(2), 231-237.

[15] Luo, S., Fan, J., Liu, W., Zhang, M., Song, Z., Lin, C., Chu, P. K. (2006). Synthesis and low-temperature photoluminescence properties of SnO2 nanowires and nanobelts. Nanotechnology, 17(6), 1695.

[16] Liqiang, J., Xiaojun, S., Baifu, X., Baiqi, W., Weimin, C., Honggang, F. (2004). The preparation and characterization of La doped TiO2 nanoparticles and their photocatalytic activity. Journal of solid state chemistry, 177(10), 3375-3382.

[17] Prairie, M. R., Evans, L. R., Stange, B. M., Martinez, S. L. (1993). An investigation of titanium dioxide photocatalysis for the treatment of water contaminated with metals and organic chemicals. Environmental science and technology, 27(9), 1776-1782.