INSIGHTS INTO DICLOFENAC REMOVAL USING A SOLAR PHOTO-FENTON PROCESS MEDIATED BY FERRIOXALATE AT NEAR NEUTRAL PH

INSIGHTS INTO DICLOFENAC REMOVAL USING A SOLAR PHOTO-FENTON PROCESS MEDIATED BY FERRIOXALATE AT NEAR NEUTRAL PH

SOUZA, B. M.; DEZOTTI, M. W. C.; BOAVENTURA, R. A. R.; VILAR, V. J. P.

Artigo:

This study evaluates the degradation of the drug diclofenac (DCF) in aqueous solutions by a photo-Fenton process using natural and simulated solar radiation. Literature describes that DCF precipitates at acid pH and Fenton‘s processes are more efficient at pH 2.8. In order to work at near neutral pH and iron concentrations below the discharge limits (2 ppm), a photo-Fenton process mediated by ferrioxalate was used. Different iron/oxalate molar ratios (1:3; 1:6 and 1:9) were tested at different pH values (5.0 and 6.0). At pH 6.0, a 1:9 iron/oxalate molar ratio was necessary to achieve complete degradation of the DCF solution (below the detection limit of the equipment) and 63% mineralization in 90 min. Lower dose of oxalic acid (1:3 iron/oxalate molar ratio) was needed to achieve the same results at pH 5.0. The reaction rate was also evaluated at different temperatures (15-45ºC), radiation intensities (27.8-59.9 WUV/m

This study evaluates the degradation of the drug diclofenac (DCF) in aqueous solutions by a photo-Fenton process using natural and simulated solar radiation. Literature describes that DCF precipitates at acid pH and Fenton‘s processes are more efficient at pH 2.8. In order to work at near neutral pH and iron concentrations below the discharge limits (2 ppm), a photo-Fenton process mediated by ferrioxalate was used. Different iron/oxalate molar ratios (1:3; 1:6 and 1:9) were tested at different pH values (5.0 and 6.0). At pH 6.0, a 1:9 iron/oxalate molar ratio was necessary to achieve complete degradation of the DCF solution (below the detection limit of the equipment) and 63% mineralization in 90 min. Lower dose of oxalic acid (1:3 iron/oxalate molar ratio) was needed to achieve the same results at pH 5.0. The reaction rate was also evaluated at different temperatures (15-45ºC), radiation intensities (27.8-59.9 WUV/m

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DOI: 10.5151/chemeng-cobeq2014-1811-17426-143612

Referências bibliográficas

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Como citar:

SOUZA, B. M.; DEZOTTI, M. W. C.; BOAVENTURA, R. A. R.; VILAR, V. J. P.; "INSIGHTS INTO DICLOFENAC REMOVAL USING A SOLAR PHOTO-FENTON PROCESS MEDIATED BY FERRIOXALATE AT NEAR NEUTRAL PH", p-9258-9265. In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 23591757, DOI 10.5151/chemeng-cobeq2014-1811-17426-143612