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2021-09-22

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cc-by-nc-nd (c) Zhang, Yanyu, et al., 2021
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/183788

H2O2 production at gas-diffusion cathodes made from agarose-derived carbons with different textural properties for acebutolol degradation in chloride media

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https://doi.org/10.1016/j.jhazmat.2021.127005

Resum

The excessive cost, unsustainability or complex production of new highly selective electrocatalysts for H2O2 production, especially noble-metal-based ones, is prohibitive in the water treatment sector. To solve this conundrum, biomass-derived carbons with adequate textural properties were synthesized via agarose doublestep pyrolysis followed by steam activation. A longer steam treatment enhanced the graphitization and porosity, even surpassing commercial carbon black. Steam treatment for 20 min yielded the greatest surface area (1248 m2 g-1), enhanced the mesopore/micropore volume distribution and increased the activity (E1/2 = 0.609 V) and yield of H2O2 (40%) as determined by RRDE. The upgraded textural properties had very positive impact on the ability of the corresponding gas-diffusion electrodes (GDEs) to accumulate H2O2, reaching Faradaic current efficiencies of ~95% at 30 min. Acidic solutions of β-blocker acebutolol were treated by photoelectro- Fenton (PEF) process in synthetic media with and without chloride. In urban wastewater, total drug disappearance was reached at 60 min with almost 50% mineralization after 360 min at only 10 mA cm-2. Up to 14 degradation products were identified in the Cl--containing medium.

Matèries

Biomassa, Aigua oxigenada, Contaminació de l'aigua

Matèries (anglès)

Biomass, Hydrogen peroxide, Water pollution

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Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

ZHANG, Yanyu, et al. H2O2 production at gas-diffusion cathodes made from agarose-derived carbons with different textural properties for acebutolol degradation in chloride media. Journal of Hazardous Materials. 2021. Vol. 423, num. 127005. ISSN 0304-3894. [consulted: 8 of June of 2026]. Available at: https://hdl.handle.net/2445/183788

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