Photocatalytic ozonation:Maximization of the reaction rate and control of undesired by-products
- Autori: Parrino, F; Camera-Roda, G; Loddo, V; Palmisano, L; Augugliaro, V
- Anno di pubblicazione: 2014
- Tipologia: Articolo in rivista (Articolo in rivista)
- Parole Chiave: Photocatalysis, Photocatalytic ozonation, Ozone, Bromate, Process intensification
- OA Link: http://hdl.handle.net/10447/176191
Abstract
In theso-calledphotocatalyticozonation(PO)synergisticeffectsbetweenphotocatalysisandozonation enhance therateofoxidationoforganiccompounds,thereforethisintegratedprocessisverypromising for useinwatertreatment.Inthepresentwork,itisdemonstratedthattheimprovementthatcanbe obtained bytheintegratedprocessincomparisonwiththeuncoupledprocessesdependsontherelative weight between photocatalysis and ozonation. In this respect, it has been found that a relatively low rate of photocatalysis (0.3 times the rate of ozonation)issufficienttogetthehighestsynergyandtomaximize the performancesintheoxidationofformate,theadoptedmodelorganiccompound.Thebenefitsof the couplingofphotocatalysistoozonationarenotlimitedtotheincreaseoftheoxidationrate,but include alsothecontroloftheozonationby-productofmainconcern(bromate).TheeffectofthepH,of the presenceofoxidizableorganiccompounds,ofthepresenceofnitrogenontheformationoronthe reduction ofbromateareexperimentallystudiedanddiscussed.Theobtainedresultshaverelevancefor the practicalapplicationsofPO,sinceonthesebasesitispossibletoidentifyproperoperatingconditions.