Abstract

The photochemical degradation of two azo and two anthraquinonic dyes was performed using potassiumperoxymonosulphate (Oxone) activated by UV radiation. The fast decolourization of all dyes wasobserved within 6 min of UV irradiation, with corresponding dye decays higher than 80%. The kinetic rateconstants of the dyes' decay were determined, along with the energetic efficiency of the photochemicaltreatment, taking into account the influence of a few anions commonly present in real wastewaters (i.e.,chloride, nitrate, carbonate/bicarbonate and phosphate ions). Chloride and carbonate/bicarbonate ionsenhanced dye degradation, whereas phosphate ions exerted an inhibitory effect, and nitrates did nothave a predictable influence. The dye decolourization was not associated with efficient mineralization, assuggested by the lack of a significant total organic carbon (TOC) decrease, as well as by the lowconcentrations of a few detected low molecular weight by-products, including nitrate ions, formaldehydeand organic acids. High molecular weight by-products were also detected by mass spectrometry analysis.The investigated process may be proposed as a convenient pre-treatment to help dye degradation inwastewater during combined treatment methods.

Autore Pugliese

• Volpe Angela , Mascolo Giuseppe

Tutti gli autori

• M. Pagano; A. Volpe; G. Mascolo; V. Locaputo; R. Ciannarella

Titolo volume/Rivista

Journal of environmental science and health. Part A, Environmental science and engineering & toxic and hazardous substance control

Anno di pubblicazione

2018

ISSN

1077-1204

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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