Abstract
The need of fresh water in our time has become a problem of important concern. Restore water for new uses makes purification an essential process to achieve a desired degree of quality. This need depends on each different purpose, such as purification of drinking water or recycle water for industrial need. Due to the toxic characteristics of non-biodegradable organic pollutants, new treatment technologies must be studied and Advanced Oxidation Processes (AOP’s) come up as suitable for degradation of a wide range of organic contaminants in polluted water. The optimization of photocatalysis is an important issue to turn this process viable. Organic pollutants in effluents threats the environment in several ways, in this context, textile dyes are the major responsible for the colored wastewaters disposed at effluents. This work presents the experimental results of utilizing HNO3 and NaNO3 mixture in aqueous solution for the optimization of the photocatalytic activity. 97% of the dye was degraded in 16 min. Thus, the mechanism of reaction is discussed about a new source of hydroxyl radicals which reacts with the pollutant, as it happens in troposphere.
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References
Konstantinou, I.K., Albanis, T.A.: TiO2-assisted photocatalytic degradation of azo dyes in aqueous solution: kinetic and mechanistic investigations: a review. Appl. Catal. B Environ. 49, 1–14 (2004)
Krivec, M., et al.: The nature of chlorine-inhibition of photocatalytic degradation of dichloroacetic acid in a TiO2-based microreactor. Phys. Chem. Chem. Phys. 16, 14867–14873 (2014)
Parrino, F., Livraghi, S., Giamello, E., Palmisano, L.: The Existence of nitrate radicals in irradiated TiO2 Aqueous suspensions in the presence of nitrate ions. Angew. Chemie Int. Ed. 57, 10702–10706 (2018)
Chen, H.Y., Zahraa, O., Bouchy, M.: Inhibition of the adsorption and photocatalytic degradation of an organic contaminant in an aqueous suspension of TiO2 by inorganic ions. J. Photochem. Photobiol. A Chem. 108, 37–44 (1997)
Iga G.D., de Castro Peixoto A.L., Costalonga A.G.C.: Optimization of photocatalytic degradation of methyl orange using TiO2. In: Iano Y., Arthur R., Saotome O., Vieira Estrela V., Loschi H. (eds) Proceedings of the 3rd Brazilian Technology Symposium. BTSym 2017. Springer, Cham
Scharko N.K., Berke A.E., Raff J.D. Release of nitrous acid and nitrogen dioxide from nitrate photolysis in acidic aqueous solutions. Environ. Sci. Technol. 11991–12001 (2014)
Folli A., Campbell SB., Anderson J.A., MacPhee D.E.: Role of TiO2 surface hydration on NO oxidation photo-activity. Photochem. Photobiol. A Chem. 85–93 (2011)
Kontos A.G., Katsanaki A., Likodimos V., et al.: Continuous flow photocatalytic oxidation of nitrogen oxides over anodized nanotubular titania films. Chem. Eng. 151–157 (2012)
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Iga, G.D., de Castro Peixoto, A.L., Costalonga, A.G.C. (2019). Efficient Optimization of Photocatalytic Process for Azo Dyes. In: Iano, Y., Arthur, R., Saotome, O., Vieira Estrela, V., Loschi, H. (eds) Proceedings of the 4th Brazilian Technology Symposium (BTSym'18). BTSym 2018. Smart Innovation, Systems and Technologies, vol 140. Springer, Cham. https://doi.org/10.1007/978-3-030-16053-1_30
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DOI: https://doi.org/10.1007/978-3-030-16053-1_30
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