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Photo-assisted electrochemical degradation of polychlorinated biphenyls with boron-doped diamond electrodes

Gutiérrez Hernández, Rubén Fernando [autor] | Bello Mendoza, Ricardo [autor] | Hernández Ramírez, Aracely [autora] | Malo, Edi A [autor] | Nájera Aguilar, Hugo Alejandro [autor].
Tipo de material: Artículo en línea Artículo en línea Tipo de contenido: Texto Tipo de medio: Computadora Tipo de portador: Recurso en líneaTema(s): Bifenilos policlorados | Contaminantes orgánicos persistentes | Procesos avanzados de oxidación | Sistema fotoelectro fentonTema(s) en inglés: Polychlorinated biphenyls | Persistent organic pollutants | Advanced oxidation processes | Photoelectro fenton systemNota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Environmental Technology. Volumen 40, número 1 (Sep. 2019), páginas 1-10. --ISSN: 0959-3330Número de sistema: 33106Resumen:
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The capacity of the photo electro-Fenton (PEF) process to degrade a mixture of seven polychlorinated biphenyl (PCB) congeners was studied. Boron-doped diamond (BDD) sheets were used as anode and cathode in the experimental electrolytic cell that contained Na2SO4 0.05 M at pH 3 as supporting electrolyte for the electro generation of H2O2 at the cathode. The effects of UV light intensity (254 and 365 nm), current density (8, 16 and 24 mA cm−²) and ferrous ion dosage (0.1, 0.2 and 0.3 mM) on PCB (C0 = 50 μg L−¹) degradation were evaluated. The highest level of PCB degradation (97%) was achieved with 16 mA cm−² of current density, 0.1 mM of ferrous ion and UV light at 365 nm as irradiation source after 6 h of reaction. PCB28, PCB52 and PCB101 were not detected after 0.5, 1.5 and 3 h of reaction, respectively. The degradation of PCB138, PCB153, PCB180 and PCB209 was also high (>95%). The PEF system outperformed other oxidation processes (electro-Fenton, anodic oxidation, Fenton, photo-Fenton and UV photolysis) in terms of reaction rate and degradation efficiency. These results demonstrate for the first time the degradation of PCB209, the most highly chlorinated PCB congener, by an advanced electrochemical oxidation process.
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The capacity of the photo electro-Fenton (PEF) process to degrade a mixture of seven polychlorinated biphenyl (PCB) congeners was studied. Boron-doped diamond (BDD) sheets were used as anode and cathode in the experimental electrolytic cell that contained Na2SO4 0.05 M at pH 3 as supporting electrolyte for the electro generation of H2O2 at the cathode. The effects of UV light intensity (254 and 365 nm), current density (8, 16 and 24 mA cm−²) and ferrous ion dosage (0.1, 0.2 and 0.3 mM) on PCB (C0 = 50 μg L−¹) degradation were evaluated. The highest level of PCB degradation (97%) was achieved with 16 mA cm−² of current density, 0.1 mM of ferrous ion and UV light at 365 nm as irradiation source after 6 h of reaction. PCB28, PCB52 and PCB101 were not detected after 0.5, 1.5 and 3 h of reaction, respectively. The degradation of PCB138, PCB153, PCB180 and PCB209 was also high (>95%). The PEF system outperformed other oxidation processes (electro-Fenton, anodic oxidation, Fenton, photo-Fenton and UV photolysis) in terms of reaction rate and degradation efficiency. These results demonstrate for the first time the degradation of PCB209, the most highly chlorinated PCB congener, by an advanced electrochemical oxidation process. eng

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