A ferrous oxalate mediated photo-Fenton system: Toward an increased biodegradability of indigo dyed wastewaters

Vedrenne, Michel; Vásquez-Medrano, Rubén; Prato-Garcia, Dorian; Frontana‐Uribe, Bernardo A.; Hernández‐Esparza, Margarita; Andrés, Juan Manuel de

doi:10.1016/j.jhazmat.2012.10.032

Cited by 99 publications

(23 citation statements)

References 58 publications

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“…For example, the photolysis of Fe 3+ -NOM carboxylate or Fe 3+ -polycarboxylate complexes through LMCT reaction, leads to the formation of Fe 2+ , which is introduced in the photo-Fenton cycle and the concomitant oxidation of the organic ligand (Eqs. (6) and (7)) [19][20][21] …”

Section: Introductionmentioning

confidence: 99%

Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Ndounla

Kenfack

Wéthé³

et al. 2014

Applied Catalysis B: Environmental

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a b s t r a c tThe inactivation of total coliforms/E. coli (10 4 CFU/mL) and Salmonella spp. (10 5 CFU/mL) in well water naturally containing dissolved (Fe 2+/3+ ) and solid iron forms (e.g. iron oxides) was carried out by photo Fenton treatment (Fe 2+, 3+ /H 2 O 2 /hv). In a preliminary run under simulated solar radiation, beyond 4 mg/L of added H 2 O 2 , the enteric bacteria were totally inactivated after 90 min. Thereafter, 25 L of well water were treated in the compound parabolic collector (CPC) under direct solar radiation. Three irradiation periods (i) 8 am to 2 pm (8-14 h), (ii) 10 am to 4 pm (10-16 h) and (iii) 12 pm to 6 pm (12-18 h) were evaluated for assessing the impact of different solar irradiances (W m −2 ) on the enteric bacterial inactivation rates. Both studied strains were totally inactivated under sole exposure to solar radiation in the CPC when the experiments were conducted from 8 to 14 h or 10 to 16 h. However, Salmonella spp. strains regrowth was noticed after the 24 h dark storage in all the samples previously treated with bare solar radiation. As the treated water contained Fe, the photo-Fenton disinfection at field scale in the CPC was carried out with the addition of H 2 O 2 (10 mg/L). Significant enhancement of the enteric bacteria inactivation rate was therefore recorded comparatively to the one obtained under bare solar treatment. No regrowth was observed in water treated by photo-Fenton disinfection one week after the treatment. The comparative evaluation of photo-Fenton disinfection rate as a function of different irradiation periods was based on the monitoring of the effective disinfection time (EDT), or required time to acquire the total inactivation of targeted bacteria in defined conditions. Therefore, significant impact of the irradiance on the process was noticed. High average irradiance (AI) of 35 W m −2 led to the total inactivation of Salmonella spp. in an EDT of 45 min and a dose of 26 Wh m −2 ; while low irradiance of 20 W m −2 required an EDT of 180 min for a dose 60 Wh m −2 . Thus, the experiments revealed that lower irradiance level leads to higher doses to achieve the bacterial disinfection. pH, as well as nitrite and nitrate concentration, increased during the photo-disinfection processes, while depletion was recorded for aqueous ammonia concentration.

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Section: Introductionmentioning

confidence: 99%

Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Ndounla

Kenfack

Wéthé³

et al. 2014

Applied Catalysis B: Environmental

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“…The application of solar radiation in the photolectro-Fenton process yielded higher current efficiencies and lower energy consumptions than electro-Fenton (EF) and electro-oxidation, with electrogenerated H 2 O 2 by the additional production of hydroxyl radicals from the photolysis of Fe(III)-hydrated species (reaction (11)), and the photodecomposition of Fe(III)-complexes with organic intermediates (ferric carboxylic complexes, like ferric oxalate) that pass through an excitation state under the influence of photons of UV/vis wavelengths. This reaction is called the ligand-metal charge transfer reaction [66][67][68]:…”

Section: The Electrochemical Fenton-based (Ef) Processesmentioning

confidence: 99%

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Gutierrez-Mata

Velázquez-Martínez

Álvarez-Gallegos

et al. 2017

International Journal of Photoenergy

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This literature research, although not exhaustive, gives perspective to solar-driven photocatalysis, such as solar photo-Fenton and TiO 2 solar photocatalysis, reported in the literature for the degradation of aqueous organic pollutants. Parameters that influence the degradation and mineralization of organics like catalyst preparation, type and load of catalyst, catalyst phase, pH, applied potential, and type of organic pollutant are addressed. Such parameters may also affect the photoactivity of the catalysts used in the studied solar processes. Solar irradiation is a renewable, abundant, and pollution-free energy source for low-cost commercial applications. Therefore, these solar processes represent an environmentally friendly alternative mainly because the use of electricity can be decreased/avoided.

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“…(Tran et al 2013). Además, los mismos complejos tienen la capacidad de reaccionar también con el oxígeno disuelto en la solución para formar radicales superóxido y posteriormente H 2 O 2 , los cuales a su vez incrementan la velocidad de generación de radicales hidroxilo (Vedrenne et al 2012 …”

Section: Experimentos Testigounclassified

Mineralización De Etilenglicol Por Foto-Fenton Asistido Con Ferrioxalato

Arias

Arriola

Calle

et al. 2016

Rev. Int. Contam. Ambie.

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Palabras clave: agua residual de la industria de pinturas, ion ferroso, peróxido de hidrógeno, ion oxálico RESUMEN Se evaluó la efectividad del proceso foto-Fenton asistido con ferrioxalato para la mineralización de 1000 mg/L de etilenglicol presente en agua destilada y en agua residual proveniente de una planta de producción de pinturas. Se observó que la eficiencia de mineralización del etilenglicol es función de las concentraciones iniciales de ion ferroso, oxalato y peróxido de hidrógeno. Los mayores niveles de degradación del etilenglicol (90 y 85 %, para el agua destilada y el agua residual, respectivamente), se obtuvieron con 10 mg/L de Fe 2+ , 150 mg/L de C 2 O 4 2-y 500 mg/L de H 2 O 2 , después de 3 h de irradiación artificial con lámparas UV a una longitud de onda máxima de 365 nm. La descomposición del etilenglicol produjo cantidades traza (< 136 mg/L) de ácido acético y ácido fórmico, por lo que la disminución en la demanda química de oxígeno debida a este contaminante fue prácticamente total, ya que no se detectó ningún otro producto intermediario. El hierro no actuó directamente de manera catalítica en el sistema.Key words: wastewater from the paint industry, hydrogen peroxide, ferrous ion, oxalic ion ABSTRACTThe effectiveness of the ethylene glycol mineralization using ferrioxalate-induced photo-Fenton was evaluated. The efficiency of 1000 mg/L ethylene degradation was a function of the initial concentrations of ferrous ion, oxalate and hydrogen peroxide. The highest levels of degradation (90 and 85 % for distilled water and wastewater from the paint industry, respectively) were obtained using 10 mg/L of Fe 2+ , 150 mg/L of C 2 O 4 2-and 500 mg/L of H 2 O 2 after 3 hours of UV artificial irradiation (wavelength ~ 365 nm). Ethylene glycol was converted to acetic acid and formic acid in trace amounts (< 136 mg/L) resulting in a decrease of chemical oxygen demand due this contaminant. No other intermediate products were detected.

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A ferrous oxalate mediated photo-Fenton system: Toward an increased biodegradability of indigo dyed wastewaters

Cited by 99 publications

References 58 publications

Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Recent Overview of Solar Photocatalysis and Solar Photo-Fenton Processes for Wastewater Treatment

Mineralización De Etilenglicol Por Foto-Fenton Asistido Con Ferrioxalato

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