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Open AccessFeature PaperArticle

Degradation of Acid Orange 7 Azo Dye in Aqueous Solution by a Catalytic-Assisted, Non-Thermal Plasma Process

1
Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano (Salerno), Italy
2
Department of Pharmacy, University of Salerno, via Giovanni Paolo II, 132, 84084 Fisciano (Salerno), Italy
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(8), 888; https://doi.org/10.3390/catal10080888
Received: 15 July 2020 / Revised: 29 July 2020 / Accepted: 3 August 2020 / Published: 5 August 2020
The aim of this work was the optimization of the performance of the cold plasma technology coupled with a structured catalyst for the discoloration and mineralization of “acid orange 7” (AO7) azo dye. The structured catalyst consists of Fe2O3 immobilized on glass spheres, and it was prepared by the “dip coating” method and characterized by different chemico-physical techniques. The experiments were carried out in a dielectric barrier discharge (DBD) reactor. Thanks to the presence of the catalytic packed material, the complete discoloration and mineralization of the dye was achieved with voltage equal to 12 kV, lower than those generally used with this technology (approximately 20–40 kV). The best result in terms of discoloration and mineralization (80% after only 5 min both for discoloration and mineralization) was obtained with 0.25 wt% of Fe2O3 immobilized on the glass spheres, without formation of reaction by-products, as shown by the HPLC analysis. The optimized catalyst was reused for several reuse cycles without any substantial decrease of performances. Moreover, tests with radical scavengers evidenced that the most responsible oxidizing species for the degradation of AO7 dye was O2•−. View Full-Text
Keywords: catalytic-assisted cold plasma; acid orange 7 azo dye; dielectric barrier discharge; water treatment catalytic-assisted cold plasma; acid orange 7 azo dye; dielectric barrier discharge; water treatment
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MDPI and ACS Style

Iervolino, G.; Vaiano, V.; Pepe, G.; Campiglia, P.; Palma, V. Degradation of Acid Orange 7 Azo Dye in Aqueous Solution by a Catalytic-Assisted, Non-Thermal Plasma Process. Catalysts 2020, 10, 888.

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