Mineralización De Etilenglicol Por Foto-Fenton Asistido Con Ferrioxalato

Abstract

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.

Degradation of Ethylene Glycol Through Photo-Fenton Heterogeneous System

“…Together with the extremely low amounts of iron that leached through the photoreactions (< 2 %), this fact points to the high stability of this material synthetized by sol-gel method and studied in this work. Although encouraging values were obtained in the percentages of degradation of EG in the photo-Fenton heterogeneous system, the obtained results in our previous investigation of EG degradation in a homogeneous system [1] revealed that the best removal efficiencies for EG are reached using a ferrioxalate-induced photo-Fenton system. Thus, the highest level of degradation (90 %) was obtained using 10 mg/L of Fe 2+ , 150 mg/L of C 2 O 4 2and 500 mg/L of H 2 O 2 after 3 h of UV artificial irradiation.…”

“…Ethylene glycol (EG) is widely used in numerous industrial applications such as solvent in the paint and plastic industries, in some skin lotions and flavoring essences and also as deicing fluid for airport run ways and antifreeze agent in cooling systems [1][2][3][4]. Typical concentrations of EG in industrial wastewater scan can be in the 25-250 g/L range.…”

“…H 2 O 2 /UV, Fenton and photo-Fenton homogeneous systems are characterized by their high efficiency and simple application, and some of them have been studied for treating and mineralization of EG [1][2][3][4]. However, in the treatment approaches based on the use of solution phase (homogeneous), catalytic recycles may be impractical if the catalyst cannot be separated from wastewater for reusage.…”

Greener synthesis of chemical compounds and materials

“…A recent review on photocatalysis [27] describes generation of singlet oxygen and its role in the photo-oxygenation (incorporation of molecular oxygen into molecules), combination of photochemical processes with enzyme catalysis, application of continuous flows or microreactors for their optimization. Some examples of such reactions are the synthesis of N-containing heterocycles by photo-oxidation of furan derivatives, asymmetric oxidations catalysed with enzymes, and preparation of several F-organic compounds by photocatalysed trifluoromethylation of aromatics, using photocatalysis booth and reactors described in [28].…”

Green Chemistry and Molecularly Imprinted Membranes

“…Among various applications of GC, great advantages derive from the employment of water and other green solvents in chemical reactions such as aqueous catalysis [ 34 , 35 , 36 ], of supercritical fluids (i.e., supercritical CO 2 ) [ 37 , 38 ], ionic liquids (ILs) [ 39 , 40 , 41 ], deep eutectic solvents (DES) [ 42 , 43 , 44 ] and fluorous media [ 45 ]. Other green approaches are microwave-assisted and ultrasound-assisted processes [ 46 , 47 , 48 ], hydro/solvo thermal reactions [ 49 , 50 ], magnetic field-assisted synthesis [ 51 ], mechanochemistry [ 52 ], and UV irradiation [ 53 , 54 ]. All these approaches and the evolution of GC have been accurately reviewed [ 1 , 55 , 56 , 57 , 58 , 59 , 60 , 61 ], highlighting that over the last 20 years, the principles of green chemistry have strengthened the environmental sustainability of chemical processes.…”