High surface area modified Ti-felt electrodes for the degradation of polystyrene nanoplastics
[EN] Ti-felt electrodes with high surface area have been used as supports of electroactive coatings (Pt and SnO2-Sb-Pt). The electrodes obtained have been employed for the electrochemical oxidation of polystyrene nanoplastics (NPs) (100 nm) in solution. Voltammetric characterization of the electrode...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/230740 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/230740 |
| Access Level: | acceso abierto |
| Palabra clave: | Advanced oxidation processes Nanoplastics Polystyrene Titanium felt Electrooxidation 06.- Garantizar la disponibilidad y la gestión sostenible del agua y el saneamiento para todos 14.- Conservar y utilizar de forma sostenible los océanos, mares y recursos marinos para lograr el desarrollo sostenible |
| Sumario: | [EN] Ti-felt electrodes with high surface area have been used as supports of electroactive coatings (Pt and SnO2-Sb-Pt). The electrodes obtained have been employed for the electrochemical oxidation of polystyrene nanoplastics (NPs) (100 nm) in solution. Voltammetric characterization of the electrodes with Ru(NH3)6Cl3 and K3Fe(CN)6 redox mediators showed a substantial increase in the redox peaks¿ current density compared to the boron-dopeddiamond electrode. For example, this increase was >68-fold for the SnO2-Sb-Pt electrode when using the Ru (NH3)6Cl3 redox mediator. This can be attributed to the enhanced surface area of Ti-felt, composed of 20 m diameter fibers, and the roughness of the electrocatalyst coatings. Voltammetric characterization of Ti-Pt and TiSnO2-Sb-Pt in 0.03 M Na2SO4 media showed an increase in the anodic current density when adding NPs, which would account for a direct mechanism of electrooxidation of the electrode. OH, S2O82, H2O2, and O3 generation were also determined for both types of electrodes. The degradation of NPs was monitored by fluorescence spectroscopy, taking advantage of the fluorescence of styrene. In addition, it was observed that the scattering of the second-order diffraction light (this phenomenon takes place in the diffraction grating of the monochromator) by NPs could also be used to monitor the evolution of the NPs concentration in solution. The electrochemical degradation of polystyrene NPs was faster with SnO2-Sb-Pt modified Ti-felt based electrodes than with the Ptmodified one (reaching 90 % degradation in 100 and 210 min at 25 mA cm 2, respectively). Electrochemical energy consumption per order was also lower for SnO2-Sb-Pt-modified electrodes. |
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