Feasible HS Sensing in Water with a Printed Amperometric Microsensor
Paré, Franc (Universitat Autònoma de Barcelona. Departament de Química)
Castro, Rebeca (Universitat Politècnica de Catalunya. Departament d'Enginyeria de Mines i Recursos Naturals)
Gabriel, David (Universitat Autònoma de Barcelona. Departament d'Enginyeria Química, Biològica i Ambiental)
Guimerà Villalba, Xavier (Universitat Politècnica de Catalunya. Departament d'Enginyeria de Mines i Recursos Naturals)
Gabriel, Gemma (Instituto de Salud Carlos III)
Baeza Labat, Maria del Mar (Universitat Autònoma de Barcelona. Departament de Química)

Date:	2023
Abstract:	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.
Grants:	Agencia Estatal de Investigación PID2021-126253OB-C21
Note:	Altres ajuts: acords transformatius de la UAB
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Amperometric sensor ; Hydrogen sulfide ; Inkjet-printed electrodes ; Single-walled carbon nanotubes ; Direct ink writing
Published in:	ACS Es&t Water, Vol. 3, Issue 4 (April 2023) , p. 1116-1125, ISSN 2690-0637

DOI: 10.1021/acsestwater.2c00589
PMID: 38156327

10 p, 8.5 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Engineering > GENOCOV
Articles > Research articles
Articles > Published articles