نبذة مختصرة : [EN] In this work, a systematic study on the effect of Fe(III) complexation by phenolic derivatives with different substitution on photo-Fenton has been carried out. Solutions containing a mixture of six pollutants (30 mg.L-1) were treated by solar simulated photo-Fenton ([Fe(II)] = 0.09 mmol.L-1, [H2O2] = 4.29 mmol.L-1, pH = 5, [Ligand] = 0.227 mmol.L-1. The efficiency of ligand increased with the presence of-OH groups (mainly in ortho-position), while the reverse was true for-COOH and-OCH3. This was correlated with the ability of the ligands to reduce Fe(III) to Fe(II). Catechol (CAT) supressed the interference of chlorides at [NaCl] = 30 mg/L-1 by complexing iron(III) thus preventing formation of FeCl2+, as 85% of Fe(III) was found as Fe(CAT)(3) according to mathematical calculations. Hence, effluent matrix, including anions and organic pollutants, has a remarkable effect on iron speciation and a it should be considered when determining reaction conditions. ; Authors want to acknoledge the financial support of Spanish Ministerio de Ciencia e Innovacion (PID2021-126400OB-C31, AquaEnAgri Project) . and TED2021-130994B-C31 and TED2021-130994B-C32 (Ecotranseas) . J. Moreno-Andres acknowledges Grant IJC2020- 042741-I funded my MCIN/AEI/10.13039/501100011033 and by the European Union NextGenerationEU/PRTR. I. Sciscenko wants to acknowledge Generalitat Valenciana (CUBackspaceIAPOS/2021/311. I. Valles ackonowledges Ministerio de Universidades (FPU21/01336). ; Vallés-Ferrer, I.; Sciscenko, IM.; Mora Carbonell, M.; Micó Tormos, P.; Amat Payá, AM.; Santos-Juanes Jordá, L.; Moreno-Andrés, J. (2023). On the relevant role of iron complexation for the performance of photo-Fenton process at mild pH: Role of ring substitution in phenolic ligand and interaction with halides. Applied Catalysis B Environmental. 331:122708-122717. https://doi.org/10.1016/j.apcatb.2023.122708 ; 122708 ; 122717 ; 331
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