| Title | Oxidation of azo and anthraquinonic dyes by peroxymonosulphate activated by UV light |
| Abstract | The photochemical degradation of two azo and two anthraquinonic dyes was performed using potassium
peroxymonosulphate (Oxone) activated by UV radiation. The fast decolourization of all dyes was
observed within 6 min of UV irradiation, with corresponding dye decays higher than 80%. The kinetic rate
constants of the dyes' decay were determined, along with the energetic efficiency of the photochemical
treatment, 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 ions
enhanced dye degradation, whereas phosphate ions exerted an inhibitory effect, and nitrates did not
have a predictable influence. The dye decolourization was not associated with efficient mineralization, as
suggested by the lack of a significant total organic carbon (TOC) decrease, as well as by the low
concentrations of a few detected low molecular weight by-products, including nitrate ions, formaldehyde
and 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 in
wastewater during combined treatment methods. |
| Source | Journal of environmental science and health. Part A, Environmental science and engineering & toxic and hazardous substance control 53 (4), pp. 393–404 |
| Keywords | Dye wastewater;decolourizationoxonesulphate radicalsazo dyesanthraquinonic dyes |
| Journal | Journal of environmental science and health. Part A, Environmental science and engineering & toxic and hazardous substance control |
| Editor | Marcel Dekker,, Monticello, NY, Stati Uniti d'America |
| Year | 2018 |
| Type | Articolo in rivista |
| DOI | 10.1080/10934529.2017.1404331 |
| Authors | Michele Pagano, Ruggiero Ciannarella, Vito Locaputo, Giuseppe Mascolo and Angela Volpe |
| Text | 384234 2018 10.1080/10934529.2017.1404331 ISI Web of Science WOS WOS 000425703000010 Scopus 2 s2.0 85039153328 Dye wastewater; decolourization oxone sulphate radicals azo dyes anthraquinonic dyes Oxidation of azo and anthraquinonic dyes by peroxymonosulphate activated by UV light Michele Pagano, Ruggiero Ciannarella, Vito Locaputo, Giuseppe Mascolo and Angela Volpe Consiglio Nazionale delle Ricerche, Istituto di Ricerca Sulle Acque CNR IRSA , The photochemical degradation of two azo and two anthraquinonic dyes was performed using potassium peroxymonosulphate Oxone activated by UV radiation. The fast decolourization of all dyes was observed within 6 min of UV irradiation, with corresponding dye decays higher than 80%. The kinetic rate constants of the dyes decay were determined, along with the energetic efficiency of the photochemical treatment, 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 ions enhanced dye degradation, whereas phosphate ions exerted an inhibitory effect, and nitrates did not have a predictable influence. The dye decolourization was not associated with efficient mineralization, as suggested by the lack of a significant total organic carbon TOC decrease, as well as by the low concentrations of a few detected low molecular weight by products, including nitrate ions, formaldehyde and 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 in wastewater during combined treatment methods. 53 Published version https //doi.org/10.1080/10934529.2017.1404331 08/11/2017 Oxidation of azo and anthraquinonic dyes by peroxymonosulphate activated by UV light JESH 2018, 53 4 , 393 404.pdf Articolo in rivista Marcel Dekker, 1077 1204 Journal of environmental science and health. Part A, Environmental science and engineering toxic and hazardous substance control Journal of environmental science and health. Part A, Environmental science and engineering toxic and hazardous substance control J. environ. sci. health. Part A, Environ. sci. eng. toxic hazard. substance control Journal of environmental science and health. Environmental science and engineering toxic and hazardous substance control Environmental science and engineering and toxic and hazardous substance control angela.volpe VOLPE ANGELA vito.locaputo LOCAPUTO VITO michele.pagano PAGANO MICHELE ruggiero.ciannarella CIANNARELLA RUGGIERO giuseppe.mascolo MASCOLO GIUSEPPE TA.P07.002.006 Trattamenti avanzati di ossidazione |
