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Water Contaminated by Industrial Textile Dye: Study on Decolorization Process

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Dipartimento di Ingegneria Meccanica, Energetica e Gestionale. Università della Calabria, I-87036 Arcavacata di Rende (CS), Italy
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Dipartimento di Ingegneria per l’Ambiente ed il Territorio ed Ingegneria Chimica. Università della Calabria, I-87036 Arcavacata di Rende (CS), Italy
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Dipartimento di Farmacia e Scienze della Salute e della Nutrizione. Università della Calabria, I-87036 Arcavacata di Rende (CS), Italy
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Authors to whom correspondence should be addressed.
Environments 2019, 6(9), 101; https://doi.org/10.3390/environments6090101
Received: 25 July 2019 / Revised: 23 August 2019 / Accepted: 26 August 2019 / Published: 2 September 2019
This work aims to investigate possible interferences due to the presence of sodium carbonate on the photodegradation of the reactive Black 5 azoic dye, both in systems containing only titanium oxide and those containing titanium oxide and hydrogen peroxide. The role of hydrogen peroxide is explicitly treated. Sodium carbonate, in fact, is often present in the wastewater of textile industries as it is used in the fiber dyeing phases. The use of TiO2 nanoparticles is emphasized, and the possible danger is underlined. Each system was subjected to ultraviolet irradiation (UV) by varying the exposure time. After the photodegrading tests, the resulting solutions were analyzed by UV-vis spectrophotometry and High-Resolution Nuclear Magnetic Resonance to measure the residual concentrations of dye. The dye degradation curves and reaction rates for different UV exposure times were obtained and discussed as a function of the used additives. All the data are repeated three times, and they differ only by a maximum of 5%. The results indicated a reduction of about 50% of the initial concentration of Reactive Black 5 after 30 min under optimal experimental conditions. The NMR analysis indicated the formation of a series of aromatic structures that were generated by the UV-induced photochemical fragmentation of the original molecule. View Full-Text
Keywords: reactive black-5; azo-dye; photodegradation; sodium carbonate; titanium dioxide; hydrogen peroxide reactive black-5; azo-dye; photodegradation; sodium carbonate; titanium dioxide; hydrogen peroxide
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MDPI and ACS Style

De Luca, P.; Foglia, P.; Siciliano, C.; Nagy, J.B.; Macario, A. Water Contaminated by Industrial Textile Dye: Study on Decolorization Process. Environments 2019, 6, 101.

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