Abstract
The decolorization and mineralization of 100mL of 290mgL-1 Sunset Yellow FCF (SY) azo dye at pH 3.0 were studied by anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF), UVA photoelectro-Fenton (PEF) and solar photoelectro-Fenton (SPEF). Trials were performed in a one-compartment cell equipped with a boron-doped diamond (BDD) anode and a carbon-PTFE air-diffusion cathode. Organics were removed by hydroxyl radical (OH) formed: (i) at the BDD anode from water oxidation, (ii) in the bulk from Fenton's reaction between added Fe2+ and generated H2O2 at the cathode and (iii) from the photolysis of Fe(OH)2+ species by UV light. The most powerful method was SPEF, achieving an almost total mineralization more rapidly than PEF due to the higher UV intensity of sunlight, which quickly photolyzes Fe(III)-carboxylate complexes that cannot be destroyed by OH in EF. However, SY was completely decolorized at similar rate by EF, PEF and SPEF. The little oxidation action of OH at the BDD anode yielded a slow decolorization and mineralization in AO-H2O2. The effect of current density on all treatments was examined. The azo dye decay always followed a pseudo-first-order reaction. It was more rapidly removed than decolorized, indicating that colored aromatic products are involved in the decolorization process. A total of 14 aromatic products and 34 hydroxylated derivatives, including benzenic, naphthalenic and phthalic acid compounds, were detected by LC-MS. Generated carboxylic acids like tartronic, oxalic, formic and oxamic were identified by ion-exclusion HPLC. The viability of SPEF at industrial scale was demonstrated using a solar pre-pilot plant with a Pt/carbon-PTFE air-diffusion cell coupled with a compound parabolic collectors (CPCs) photoreactor. In this plant, the treatment of 10L of 290mgL-1 SY at pH 3.0 between 33.2 and 77.6mAcm-2 gave total decolorization and 91-94% mineralization in short time. A plausible general reaction sequence for SY mineralization involving all oxidation products detected was proposed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 877-890 |
| Number of pages | 14 |
| Journal | Applied Catalysis B: Environmental |
| Volume | 142-143 |
| DOIs | |
| State | Published - Oct 1 2013 |
| Externally published | Yes |
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Keywords
- Anodic oxidation
- Electro-Fenton
- Oxidation products
- Solar photoelectro-Fenton
- Sunset Yellow FCF
- UVA photoelectro-Fenton
ASJC Scopus subject areas
- Catalysis
- Environmental Science(all)
- Process Chemistry and Technology
Cite this
Decolorization and mineralization of Sunset Yellow FCF azo dye by anodic oxidation, electro-Fenton, UVA photoelectro-Fenton and solar photoelectro-Fenton processes. / Moreira, Francisca C.; GARCIA SEGURA, Sergio; Vilar, Vítor J.P.; Boaventura, Rui A.R.; Brillas, Enric.
In: Applied Catalysis B: Environmental, Vol. 142-143, 01.10.2013, p. 877-890.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Decolorization and mineralization of Sunset Yellow FCF azo dye by anodic oxidation, electro-Fenton, UVA photoelectro-Fenton and solar photoelectro-Fenton processes
AU - Moreira, Francisca C.
AU - GARCIA SEGURA, Sergio
AU - Vilar, Vítor J.P.
AU - Boaventura, Rui A.R.
AU - Brillas, Enric
PY - 2013/10/1
Y1 - 2013/10/1
N2 - The decolorization and mineralization of 100mL of 290mgL-1 Sunset Yellow FCF (SY) azo dye at pH 3.0 were studied by anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF), UVA photoelectro-Fenton (PEF) and solar photoelectro-Fenton (SPEF). Trials were performed in a one-compartment cell equipped with a boron-doped diamond (BDD) anode and a carbon-PTFE air-diffusion cathode. Organics were removed by hydroxyl radical (OH) formed: (i) at the BDD anode from water oxidation, (ii) in the bulk from Fenton's reaction between added Fe2+ and generated H2O2 at the cathode and (iii) from the photolysis of Fe(OH)2+ species by UV light. The most powerful method was SPEF, achieving an almost total mineralization more rapidly than PEF due to the higher UV intensity of sunlight, which quickly photolyzes Fe(III)-carboxylate complexes that cannot be destroyed by OH in EF. However, SY was completely decolorized at similar rate by EF, PEF and SPEF. The little oxidation action of OH at the BDD anode yielded a slow decolorization and mineralization in AO-H2O2. The effect of current density on all treatments was examined. The azo dye decay always followed a pseudo-first-order reaction. It was more rapidly removed than decolorized, indicating that colored aromatic products are involved in the decolorization process. A total of 14 aromatic products and 34 hydroxylated derivatives, including benzenic, naphthalenic and phthalic acid compounds, were detected by LC-MS. Generated carboxylic acids like tartronic, oxalic, formic and oxamic were identified by ion-exclusion HPLC. The viability of SPEF at industrial scale was demonstrated using a solar pre-pilot plant with a Pt/carbon-PTFE air-diffusion cell coupled with a compound parabolic collectors (CPCs) photoreactor. In this plant, the treatment of 10L of 290mgL-1 SY at pH 3.0 between 33.2 and 77.6mAcm-2 gave total decolorization and 91-94% mineralization in short time. A plausible general reaction sequence for SY mineralization involving all oxidation products detected was proposed.
AB - The decolorization and mineralization of 100mL of 290mgL-1 Sunset Yellow FCF (SY) azo dye at pH 3.0 were studied by anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF), UVA photoelectro-Fenton (PEF) and solar photoelectro-Fenton (SPEF). Trials were performed in a one-compartment cell equipped with a boron-doped diamond (BDD) anode and a carbon-PTFE air-diffusion cathode. Organics were removed by hydroxyl radical (OH) formed: (i) at the BDD anode from water oxidation, (ii) in the bulk from Fenton's reaction between added Fe2+ and generated H2O2 at the cathode and (iii) from the photolysis of Fe(OH)2+ species by UV light. The most powerful method was SPEF, achieving an almost total mineralization more rapidly than PEF due to the higher UV intensity of sunlight, which quickly photolyzes Fe(III)-carboxylate complexes that cannot be destroyed by OH in EF. However, SY was completely decolorized at similar rate by EF, PEF and SPEF. The little oxidation action of OH at the BDD anode yielded a slow decolorization and mineralization in AO-H2O2. The effect of current density on all treatments was examined. The azo dye decay always followed a pseudo-first-order reaction. It was more rapidly removed than decolorized, indicating that colored aromatic products are involved in the decolorization process. A total of 14 aromatic products and 34 hydroxylated derivatives, including benzenic, naphthalenic and phthalic acid compounds, were detected by LC-MS. Generated carboxylic acids like tartronic, oxalic, formic and oxamic were identified by ion-exclusion HPLC. The viability of SPEF at industrial scale was demonstrated using a solar pre-pilot plant with a Pt/carbon-PTFE air-diffusion cell coupled with a compound parabolic collectors (CPCs) photoreactor. In this plant, the treatment of 10L of 290mgL-1 SY at pH 3.0 between 33.2 and 77.6mAcm-2 gave total decolorization and 91-94% mineralization in short time. A plausible general reaction sequence for SY mineralization involving all oxidation products detected was proposed.
KW - Anodic oxidation
KW - Electro-Fenton
KW - Oxidation products
KW - Solar photoelectro-Fenton
KW - Sunset Yellow FCF
KW - UVA photoelectro-Fenton
UR - http://www.scopus.com/inward/record.url?scp=84883559340&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84883559340&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2013.03.023
DO - 10.1016/j.apcatb.2013.03.023
M3 - Article
VL - 142-143
SP - 877
EP - 890
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
SN - 0926-3373
ER -