Search results for "Bromate"

showing 4 items of 14 documents

Visible-light-induced oxidation of trans-ferulic acid by TiO2 photocatalysis

2012

Abstract The oxidation of trans-ferulic acid (C10H10O4) in aqueous TiO2 dispersion occurs via the formation of a charge-transfer complex on the TiO2 surface that is able to absorb visible light (λ ⩾ 400 nm). The main product is CO2, whereas secondary oxidation products are organic species such as vanillin, caffeic acid, homovanillic acid, and vanillylmandelic acid. Oxidation through the formation of a charge-transfer complex occurs only in the presence of specific TiO2 samples. Experiments in the absence of oxygen, in the presence of bromate ions and by using a phosphate-modified TiO2, have been carried out for investigating the reaction mechanism. In order to study the interaction between …

Reaction mechanismAqueous solutiontrans-Ferulic acid photo-oxidationChemistryVanillinInorganic chemistryCharge-transfer complexPhotochemistryBromateCatalysisCatalysisFerulic acidchemistry.chemical_compoundtrans-Ferulic acid photo-oxidation Visible-light photocatalysis TiO2 Charge-transfer complexVisible-light photocatalysiPhotocatalysisCaffeic acidTitanium dioxideSettore CHIM/07 - Fondamenti Chimici Delle TecnologiePhysical and Theoretical ChemistryJournal of Catalysis
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Process Intensification by Using Ozonation Coupled with TiO2 Photocatalysis for Treating Bromide and/or Bromate Ions Containing Water: The Role of Co…

2014

Settore ING-IND/24 - Principi Di Ingegneria ChimicaOzonation Coupled TiO2 Photocatalysis Bromide BromateSettore CHIM/07 - Fondamenti Chimici Delle Tecnologie
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Photocatalytic ozonation:Maximization of the reaction rate and control of undesired by-products

2014

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 couplingofphotocatalysistoozonationarenotlimi…

Settore ING-IND/24 - Principi Di Ingegneria ChimicaSettore CHIM/03 - Chimica Generale E InorganicaSettore ING-IND/25 - Impianti ChimiciPhotocatalysis Photocatalytic ozonation Ozone Bromate Process intensification
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Photocatalytic ozonation: Maximization of the reaction rate and control of undesired by-products

2015

Abstract In the so-called photocatalytic ozonation (PO) synergistic effects between photocatalysis and ozonation enhance the rate of oxidation of organic compounds, therefore this integrated process is very promising for use in water treatment. In the present work, it is demonstrated that the improvement that can be obtained by the integrated process in comparison with the uncoupled processes depends on the relative 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) is sufficient to get the highest synergy and to maximize the performances in the oxidation of formate, the adopted model…

chemistry.chemical_classificationPhotocatalytic ozonationProcess Chemistry and TechnologyInorganic chemistrychemistry.chemical_elementBromateOrganic compoundNitrogenCatalysisReaction ratechemistry.chemical_compoundOzonePhotocatalysichemistryProcess intensificationScientific methodPhotocatalysisWater treatmentFormatePhotocatalysisBromateGeneral Environmental Science
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