Degradation of azo-reactive dyes by ultraviolet radiation in the presence of hydrogen peroxide
Source abstract
Abstract
AbstractThispapersummarizestheresultsofadegradationtestofseveralazo-reactivedyesandcottontextilewastewaterunderUVirradiationinthepresenceofH 2 O 2. Fiveofthemostcommonlyusedazo-reactivedyesfromboththeLevafixandRemazoltypesweretested.4-lDyesolutionsof100mg/lwerepreparedimmediatelybeforeirradiation.Abatchmodewater-jacketedimmersionphotoreactorwasutilized.Theradiationsourcewasa120WUVlampemittingat253.7nmandprotectedbyaquartztube.Completedestructionofthecolorofthedyesolutionswassucceededinthefirst20–30minofirradiation.Almostallthearomaticringsand80%ofTOCweredestroyedafter2hofirradiation.Thetextilewastewatercolorwascompletelyremovedinlessthan1hwhile90%ofthearomaticringsand70%ofthewastewaterCODwereremovedafter2hofirradiation.UV/H 2 O 2 provedcapableofthecompletedegradationandmineralizationoftheaboveazoreactivedyes.# 2002ElsevierScienceLtd.Allrightsreserved. Keywords:Azo-reactivedyes;Hydrogenperoxide;Hydroxylradicals;Textilewastewater;Ultravioletradiation 1. IntroductionTextile industries produce large amounts ofwastewaterduetohighconsumptionofwaterpri-marilyinthedyeingandfinishingoperations.Awell-knowncharacteristicoftextilewastewaterisahighcontentofpollutingcompounds.Thesourcesofthepollutingcompoundswhencottonisutilizedare the natural impurities extracted from thefiber,theprocessingchemicalsanddyes.Themainproblemoccurringisthatthecolorthatremainsduetothedyestuffusedmaycausedisturbancetotheecologicalsystemofthereceivingwater[1–3].Wastewater fromcottontextileoperationsisveryhardtotreatbyconventionalactivatedsludgesystems.Thecolorremainsduetothenon-bio-degradablenatureofthedyes.Physical-chemicalmethodssuchas,coagulation/flocculation,acti-vatedcarbonadsorptionandreverseosmosistech-niqueshavebeendevelopedinordertoremovethecolor[4–6].However,thelattermethodscanonlytransferthecontaminants(dyes)fromonephaseto the other leaving the problemessentiallyunsolved.Therefore,attentionhastobefocusedontechniquesthatleadtothecompletedestruc-tionofthedyemolecules.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced oxidation water treatment · Enzyme-mediated dye degradation · Dye analysis and toxicity
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References (15)
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