Abstract
The present study aims to assess the removal of 3-amino-5-methylisoxazole (AMI), a recalcitrant by-product resulting from the biological breakdown of some pharmaceuticals, applying a solar photo-Fenton process assisted by ferrioxalate complexes (SPFF) (Fe3+/H2O2/oxalic acid/UVA-Vis) and classical solar photo-Fenton process (SPF) (Fe2+/H2O2/UVA-Vis). The oxidation ability of SPFF was evaluated at different iron/oxalate molar ratios (1:3, 1:6, and 1:9, with [total iron] = 3.58 × 10−2 mM and [oxalic acid] = 1.07 × 10−1, 2.14 × 10−1 and 3.22 × 10−1 mM, respectively) and pH values (3.5–6.5), using low iron contents (2.0 mg Fe3+ L−1). Additionally, the use of other organic ligands such as citrate and ethylenediamine-N,N′-disuccinic acid (EDDS) was tested. The oxidation power of the classical SPF was assessed at different pH values (2.8–4.0) using 2.0 mg Fe2+ per liter. Furthermore, the effect of AMI concentration (2–20 mg L−1), presence of inorganic ions (Cl−, SO4 2−, NO3 −, HCO3 −, NH4 +), and radical scavengers (sodium azide and D-mannitol) on the SPF method at pH 3.5 was also assessed. Experiments were done using a lab-scale photoreactor with a compound parabolic collector (CPC) under simulated solar radiation. A pilot-scale assay was conducted using the best operation conditions. While at near neutral pH, an iron/oxalate molar ratio of 1:9 led to the removal of 72 % of AMI after 90 min of SPFF, at pH 3.5, an iron/oxalate molar ratio of 1:3 was enough to achieve complete AMI degradation (below the detection limit) after 30 min of reaction. The SPF process at pH 3.5 underwent a slower AMI degradation, reaching total AMI degradation after 40 min of reaction. The scale up of SPF process showed a good reproducibility. Oxalic and oxamic acids were identified as the main low-molecular-weight carboxylic acids detected during the pilot-scale SPF reaction.
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Acknowledgments
This work was co-financed by (i) FCT/MEC (Fundação para a Ciência e a Tecnologia/Ministério da Educação e Ciência) and FEDER (Fundo Europeu de Desenvolvimento Regional) under Program PT2020 (project UID/EQU/50020/2013) and (ii) FEDER, QREN (Quadro de Referência Estratégico Nacional), and ON2 program (Programa Operacional Regional do Norte) (project NORTE-07-0162-FEDER-000050). B.M. Souza acknowledges her Doctoral scholarship supported by Program Brazil/Portugal CAPES/FCT 308/11 (Research grant-BEX Process: 8960-12-7). B.A. Marinho acknowledges her Doctoral fellowship supported by CAPES (BEX-0983-13-6). F.C. Moreira acknowledges her Doctoral fellowship SFRH/BD/80361/2011 supported by FCT. V.J.P. Vilar acknowledges the FCT Investigator 2013 Programme (IF/01501/2013).
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Souza, B.M., Marinho, B.A., Moreira, F.C. et al. Photo-Fenton oxidation of 3-amino-5-methylisoxazole: a by-product from biological breakdown of some pharmaceutical compounds. Environ Sci Pollut Res 24, 6195–6204 (2017). https://doi.org/10.1007/s11356-015-5690-1
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DOI: https://doi.org/10.1007/s11356-015-5690-1