Disposable eco-friendly electrochemical device for trimethoprim antibiotic determination using biochar from sewage treatment plant sludge

Abstract

This study presents the development of a novel, disposable, and eco-friendly electrochemical device based on biochar-modified screen-printed electrodes (SPE/BC) for the detection of the antibiotic trimethoprim. Biochar, derived from sewage sludge, was applied as a nanomaterial to enhance the sensitivity of the sensor for trimethoprim quantification in environmental, biological, and pharmaceutical samples. Characterization techniques, including scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy, were used to assess the properties of biochar. Surface area, pore volume, and pore diameter were measured using the Brunauer–Emmett–Teller method. The electrochemical sensor performance was analyzed using impedance spectroscopy, cyclic voltammetry, and differential pulse voltammetry, revealing a strong synergistic effect on the trimethoprim oxidation process. The device showed high sensitivity with a detection limit of 71.0 nmol L⁻¹ over a linear range of 1.75–231.43 μmol L⁻¹. Recovery studies in synthetic urine, tap water, and pharmaceutical tablets demonstrated recoveries of 92%–99%, with no sample pretreatment. The sensor exhibited selectivity towards common interferents such as sulfamethoxazole, urea, and ascorbic acid, making it a practical tool for detecting trimethoprim as an emerging pollutant.

Keywords

Electrochemical sensor / Trimethoprim / Biochar / Eco-friendly / Disposable device

Highlight

•	Use of SPE/BC as a sustainable sensor for monitoring the antibiotic TMP.
•	The mesoporous structure and morphology of biochar facilitate effective TMP detection.
•	The sensor has a detection limit of 71.0 nmol L⁻1 and a linear range of 1.75–231.43 µmol L⁻1.
•	Accurate analysis of samples without the need for complex pretreatment.

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Funding

Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro(E-26/210.304/2022)

RIGHTS & PERMISSIONS

The Author(s)