Feasible H2S sensing in water with a printed amperometric microsensor
| Autor: | Franc Paré, Rebeca Castro, David Gabriel, Xavier Guimerà, Gemma Gabriel, Mireia Baeza |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Doctorat en Recursos Naturals i Medi Ambient, Universitat Politècnica de Catalunya. Departament d'Enginyeria Minera, Industrial i TIC |
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
Enginyeria química::Química del medi ambient::Química de l'aigua [Àrees temàtiques de la UPC]
Amperometric sensor Hydrogen sulfide Chemistry (miscellaneous) Environmental Chemistry Chemical Engineering (miscellaneous) Inkjet-printed electrodes Single-walled carbon nanotubes Direct ink writing Aigua -- Depuració -- Filtració Water--Purification--Filtration Water Science and Technology |
| Popis: | Concern over pollution has led to an increase in wastewater treatment systems, which require constant monitorization. In particular, hydrogen sulfide (H2S) is a toxic gas, soluble in water, commonly found in industrial and urban effluents. For proper removal control, fast, durable, and easy-to-handle analytical systems, capable of on-line measurements, such as electrochemical sensors, are required. Moreover, for a proper monitoring of said treatment processes, analysis must be carried out through all steps, thus needing for an economic and highly reproducible method of sensor fabrication. Digital printing have risen in the last few years as technologies capable of mass producing miniaturized electronical devices, allowing for the fabrication of amperometric sensors. Here, a 2 mm2 graphite (Gr) electrode, modified with different dispersions of single-walled carbon nanotubes (SWCNTs), poly(vinyl alcohol), poly(diallyl dimethylammonium chloride), and polylactic acid (PLA), is presented as a H2S sensor. SWCNTs allow for lower oxidation potentials, higher sensitivity, and a reduced rate of sulfur poisoning, while polymer dispersion of PLA increases mechanical stability and as a result, electrochemical performance. This microsensor presents an optimal pH working range between 7.5 and 11.0, a limit of detection of 4.3 µM, and the capacity to operate on complex matrices for H2S contamination detection. Authors acknowledge the grant PID2021-126253OB-C21 funded by MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”, by the “European Union”, for the financial support provided to perform this research. Finally, we thank Fusion360 and Cura for their free software. |
| Databáze: | OpenAIRE |
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