Unveiling the Dependence between Hydroxyl Radical Generation and Performance of Fenton Systems with Complexed Iron
| Autor: | Sara García-Ballesteros, Lucas Santos-Juanes, Enzo Laurenti, Paula García-Negueroles, Antonio Arques, Ana M. Amat |
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| Rok vydání: | 2019 |
| Předmět: |
Pollutants
Photo-Fenton General Chemical Engineering 02 engineering and technology 010501 environmental sciences Photochemistry 01 natural sciences Article law.invention Degradation chemistry.chemical_compound Neutral Ph Humic-Like substances law Oxidation Mild conditions Molecule Irradiation Neutral ph Electron paramagnetic resonance QD1-999 0105 earth and related environmental sciences Urban waste Water General Chemistry 021001 nanoscience & nanotechnology Chemistry chemistry Degradation (geology) Hydroxyl radical 0210 nano-technology Caffeine Bio-Based substances QUIMICA FISICA |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname ACS Omega, Vol 4, Iss 26, Pp 21698-21703 (2019) ACS Omega |
| ISSN: | 2470-1343 |
| DOI: | 10.1021/acsomega.9b02241 |
| Popis: | [EN] Humiclike substances (HLS) have been demonstrated to be useful auxiliaries to drive the (photo)-Fenton process at mild pH, by avoiding iron inactivation via formation of active complexes. However, the actual performance of the process is affected by a manifold of opposite processes. In this work, the generation of hydroxyl radical-like reactive species in the Fentonlike process has been investigated using electron paramagnetic resonance, employing 5,5-dimethyl-1-pyrroline-N-oxide as a probe molecule. The signal obtained with the Fe(II)-HLS-H2O2 system at pH = was very intense but decreased with time, in line with the difficult reduction of the formed Fe(III) to Fe(II). On the contrary, the signal of the Fe(III)-HLS-H2O2 system was weak but stable. The most intense signal was observed at HLS concentration of ca. 30 mg/L. Interestingly, the performance of the Fenton system at pH = 5 to degrade caffeine followed the same trends, although caffeine removal was very low after 1 h of irradiation. The results were more evident in a solar simulated photo-Fenton process, where an increase in the abatement of caffeine was observed until an HLS concentration of 30 mg/L, where 98% removal was reached after 1 h. The authors want to acknowledge the financial support from Ministerio de Ciencia, Innovacion y Universidades (RTI2018-097997-B-C31) and European Union (645551-RISE-2014, MAT4TREAT). P.G.-N. would like to thank Spanish Ministerio de Economia y Competitividad for her fellowship (BES-2016-077962). |
| Databáze: | OpenAIRE |
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