Degradation of atrazine by electrochemical advanced oxidation processes using a boron-doped diamond anode
Visualitza/Obre
Nuria-Atrazina-JPC-A.pdf (637,8Kb) (Accés restringit)
Sol·licita una còpia a l'autor
Què és aquest botó?
Aquest botó permet demanar una còpia d'un document restringit a l'autor. Es mostra quan:
- Disposem del correu electrònic de l'autor
- El document té una mida inferior a 20 Mb
- Es tracta d'un document d'accés restringit per decisió de l'autor o d'un document d'accés restringit per política de l'editorial
Cita com:
hdl:2117/106216
Tipus de documentArticle
Data publicació2010-05-10
Condicions d'accésAccés restringit per política de l'editorial
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
Abstract
Solutions of 30 mg L-1 of the herbicide atrazine have been degraded by environmentally friendly electrochemical advanced oxidation processes (EAOPs) such as anodic oxidation (AO), electro-Fenton (EF), and photoelectro-Fenton (PEF) using a small open and cylindrical cell with a boron-doped diamond (BDD)
anode. AO has been carried out either with a stainless steel cathode or an O2 diffusion cathode able to generate H2O2. Hydroxyl radicals (•OH) formed at the BDD surface in all EAOPs and in the bulk from Fenton’s reaction between added Fe2+ and electrogenerated H2O2 in EF and PEF are the main oxidants. All treatments yielded almost overall mineralization, although the rate for total organic carbon (TOC) removal is limited by the oxidation of persistent byproducts with •OH at the BDD surface. In AO, TOC abatement is enhanced by
parallel electrochemical reduction of organics at the stainless steel cathode, while in PEF, it also increases from additional photolysis of intermediates by UVA light under the synergistic action of •OH in the bulk. The effect of current and pH on the degradative behavior of EAOPs has been examined to determine their optimum values. Atrazine decay always follows a pseudo-first-order reaction, being more rapidly destroyed from •OH in the bulk than at the BDD surface. Aromatic intermediates such as desethylatrazine, desethyldesisopropylatrazine, and cyanuric acid and short linear carboxylic acids such as formic, oxalic, and oxamic have been identified and quantified by reversed-phase and ion-exclusion HPLC, respectively. Released inorganic ions such as Cl-, NO3-, and NH4 + have been followed by ionic chromatography.
CitacióBorras, N., Oliver, R., Arias, C., Brillas, E. Degradation of atrazine by electrochemical advanced oxidation processes using a boron-doped diamond anode. "Journal of physical chemistry A", 10 Maig 2010, vol. 114, núm. 24, p. 6613-6621.
ISSN1089-5639
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
Nuria-Atrazina-JPC-A.pdf | 637,8Kb | Accés restringit |