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Photocatalytic and sonolytic oxidation of acid orange 7 in aqueous solution

Velegraki Theodora, Poulios Ioannis , Charalabaki Magdalini , Kalogerakis Nikos, Samaras Petros, Mantzavinos Dionysis

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URIhttp://purl.tuc.gr/dl/dias/9DE90F3C-ADAA-4AC8-9C06-AC2DD67138AC-
Identifierhttps://doi.org/10.1016/j.apcatb.2005.07.007-
Languageen-
Extent9en
TitlePhotocatalytic and sonolytic oxidation of acid orange 7 in aqueous solutionen
CreatorVelegraki Theodoraen
CreatorΒελεγρακη Θεοδωραel
CreatorPoulios Ioannis en
CreatorCharalabaki Magdalini en
CreatorKalogerakis Nikosen
CreatorΚαλογερακης Νικοςel
Creator Samaras Petrosen
CreatorMantzavinos Dionysisen
CreatorΜαντζαβινος Διονυσηςel
PublisherElsevieren
DescriptionΔημοσίευση σε επιστημονικό περιοδικό el
Content SummaryThe oxidation of 50 mg/L azodye acid orange 7 (AO7) in water was investigated by means of photocatalysis in the presence of various semiconducting catalysts and ultrasound irradiation. The UVA-induced photocatalytic degradation over TiO2 anatase suspensions was found to increase with increasing catalyst concentration, decreasing solution pH, as well as in the presence of dissolved oxygen. The presence of 1,4-benzoquinone, sodium azide or sodium chloride in the reaction mixture decreased degradation due to the scavenging of radicals and other reactive moieties. Interestingly, addition of hydrogen peroxide at various concentrations from 21 to 1050 mg/L also inhibited degradation. The sonochemical degradation of AO7 was found to increase with increasing frequency and decreasing temperature. Under similar treatment conditions, ultrasound irradiation resulted in higher conversion than photocatalysis; moreover, the sonochemically irradiated solution consistently contained low aliphatic intermediates, while the photocatalytically treated solution mainly consisted of aromatic intermediates as confirmed by GC–MS analysis. The acute toxicity to marine bacteria V. fischeri decreased following oxidation with either process. Furthermore, deep sonochemical treatment slightly improved the aerobic biodegradability as assessed by shake flask tests.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-10-18-
Date of Publication2006-
SubjectAcid orange 7en
SubjectReaction intermediates (Chemistry)en
SubjectReactive intermediates (Chemistry)en
Subjectintermediates chemistryen
Subjectreaction intermediates chemistryen
Subjectreactive intermediates chemistryen
SubjectPhotocatalysisen
SubjectToxicityen
SubjectTiO2en
SubjectUltrasounden
SubjectWastewateren
Bibliographic CitationT. Velegraki, I.Poulios, M. Charalabaki, N.Kalogerakis, P.Samaras and D.Mantzavinos,"Photocatalytic and sonolytic oxidation of acid orange 7 in aqueous solution," Applied Catalysis B: Environmental, vol. 62, no. 1-2, pp. 159–168, Jan. 2006. doi: 10.1016/j.apcatb.2005.07.007en

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