Evaluation of the Discoloration of Methyl Orange Using Black Sand as Semiconductor through Photocatalytic Oxidation and Reduction
Organic compounds in wastewaters coming from textile and pharmaceutical industry generated multiple harmful effects on the environment and the human health. One of them is the methyl orange (MeO), an azoic dye considered to be a recalcitrant compound. The heterogeneous photocatalysis emerges as an alternative for treating this type of hazardous compounds, through the generation of OH radicals using radiation and a semiconductor oxide. According to the author’s knowledge, catalysts such as TiO2 doped with metals show high efficiency in degrading MeO; however, this presents economic limitations on industrial scale. Black sand can be considered as a naturally doped catalyst because in its structure is common to find compounds such as titanium, iron and aluminum oxides, also elements such as zircon, cadmium, manganese, etc. This study reports the photocatalytic activity of the mineral black sand used as semiconductor in the discoloration of MeO by oxidation and reduction photocatalytic techniques. For this, magnetic composites from the mineral were prepared (RM, M1, M2 and NM) and their activity were tested through MeO discoloration while TiO2 was used as reference. For the fractions, chemical, morphological and structural characterizations were performed using Scanning Electron Microscopy with Energy Dispersive X-Ray (SEM-EDX), X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF) analysis. M2 fraction showed higher MeO discoloration (93%) in oxidation conditions at pH 2 and it could be due to the presence of ferric oxides. However, the best result to reduction process was using M1 fraction (20%) at pH 2, which contains a higher titanium percentage. In the first process, hydrogen peroxide (H2O2) was used as electron donor agent. According to the results, black sand mineral can be used as natural semiconductor in photocatalytic process. It could be considered as a photocatalyst precursor in such processes, due to its low cost and easy access.
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 A. M. Cáez, “Decoloración del anaranjado de metilo a través de un proceso de fotocatálisis con clorofila activada”. Universidad de los Andes, Bogotá, Colombia, 2007.
 V. Brezova, A. Blazkova, E. Borosova, M. Ceppan, R. Fiala, “The influence of dissolved metal ions on the photocatalytic degradation of phenol in aqueos TiO2 suspensions”. J. Mol. Catal. Vol. 98 (2), 1995, pp. 109–116.
 C. Dominguez, J. Garcia, M.A. Pedrez, A. Torres, M.A. Galan, “Photocatalytic oxidation of organic pollutants in water”. Catal. Today. Vol. 40 (1), 1998, pp. 85–101.
 W. Baran, A. Makowski, W. Wardas, “The influence of FeCl3 on the photocatalytic degradation of dissolved azo dyes in aqueous TiO2 suspensions”. Chemosphere, vol. 53 (1), 2003, 87–95.
 K.M.G. Mostofa, H. Sakygawa, “Simultaneous photoinduced generation of Fe2+ and H2O2 in rivers: An indicator for the photo-Fenton reaction”, Journal of Environmental Sciences, vol. 47, 2016, 34-38.
 Y.H. Chang, C. C. Ou, H.W. Yeh, C. S. Yang, Photo-catalytic selectivity of anthranilic acid over iron oxide incorporated titania nanoparticles: Influence of the Fe2+/Fe3+ ratio of iron oxide, Journal of Molecular Catalysis A:Chemical, vol. 412, 2016, pp 67-77.
 R.V. Solomon, I.S. Lydia, J.P. Merlin, P. Venuvanalingam. “Enhanced photocatalytic degradation of azo dyes using nano Fe3O4”. Iranian Chemical Society, 2012.
 Y. Gao, M. Yang, J. Hu, Y. Zhang. “Fenton’s process for simultaneous removal of TOC and Fe2+ form acidic waste liquor”. Desalination, vol. 160, 2004, pp. 123-130.
 M.M. Rashad, E.M. Elsayed, M.S. Al-Kotb, A.E. Shalan. “The structural, optical, magnetic and photocatalytic properties of transition metal ions doped TiO2 nanoparticles”. Journal of Alloys and Compounds, vol. 581, 2013, 71–78.
 W. K. Wang, J. J. Chen, M. Gaio, Y. X. Huang, X. Zhang, H. Q. Yu, “Photocatalytic degradation of atrazine by boron-doped TiO2 with a tunable rutile/anatase ratio”, Applied Catalysis B. Environmental, vol. 195, 2016, pp 69-76
 X. Q. Cheng, C.Y. Ma, X. X. Yi, F. Yuan, Y. Xie, J. M. Hu, B. C. Hu, Q.Y. Zhang, “Structural, morphological, optical and photocatalytic properties of Gd-doped TiO2 films”, Thin Solid Films, vol. 615, 2016, pp 13-18
 S. Oros, R. Gómez, R. López, A. Hernández, J.A. Pedraza, E. Moctezuma, E. Pérez. “Photocatalytic reduction of methyl orange on Au/TiO2 semiconductors”, Catalysis Communications, vol. 21, 2012, pp. 72-76.
 M.E. Borges, M. Sierra, E. Cuevas, R. D. García, P. Esparza, “Photocatalysis with solar energy: Sunlight-responsive photocatalyst base don TiO2 loaded on a natural material for wastewater treatment”, Solar Energy, vol. 135, 2016, pp. 527-535.
 M.A. Schoonen, Y. Xu, D.R. Strongin, “An introduction of geocatalysis”, Journal of Geochemical Exploration, vol. 62, 1998, pp. 201-215.
 H. He, Y. Zhong, X. Liang, W. Tan, J. Zhu, C.Y. Wang, “Natural Magnetite: an efficient catalyst for the degradation of organic contaminant”, Cientific Reports, 2015.
 P. García, G. Pliego, J.A. Zazo, A. Bahamonde, J.A. Casas, “Ilmenite (FeTiO3) as low cost catalyst for advanced oxidation processes”, Journal of Environmental Chemical Engineering, vol. 4 (1), 2016, pp. 542-548.
 Vargas, J. A., Castañeda, E. A., Forero, A. H., & Díaz, S. C. (2011). “Obtención de hierro a partir de arenas negras del atlántico colombiano desembocadura río Magdalena”. Revista de la Facultad de Ingeniería, pp. 19-26.
 Ponce Muriel, Á. (Agosto de 2010). Panorama del sector minero. Obtained on May of 2014 from http6ww.simco.gov.co/LinkClick.aspx?fileticket=SW5htFa4evE
 K.Sahel, L. Elsellami, I. Mirali, F. Dappozze, M. Bouhent, C. Guillard, “Hydrogen peroxide and photocatalysis”, Applied Catalysis B: Environmental, vol. 188, 2016, pp. 106-112.
 N. A. Youssef, S. A. Shaban, F. A. Ibrahim, A. S. Mahmoud, “Degradation of methyl orange using Fenton catalytic reaction”, Egyptian Journal of Petroleum, Available online 4 January 2016.
 J. A. Torres, N. R. Sanabria, J. G. Carriazo, “Powders of iron (III)-doped titanium dioxide obtained by direct way from a natural ilmenite”, Powder technology, vol. 302, 2016, pp. 254-260.