Contamination of waters by acetaminophen (paracetamol), one of the most consumed non-opioid analgesics, is a cause of public concern owing to inadequate disposal and inefficient water treatment. In this paper, we report on a photoelectrochemical (PEC) sensor made with screen-printed carbon electrodes (SPCEs) modified with carbon spherical shells (CSS) and cobalt(II) phthalocyanine (CoPc) to determine acetaminophen in tap water and tablet samples. The CSS were synthesized from D-glucose and water via a hydrothermal route. They had an average diameter of 180 ± 40 nm and band gap (Eg) of 1.3 eV estimated from the Tauc plot using diffuse reflectance spectroscopy. An excellent performance was obtained with the PEC sensor detecting acetaminophen in a wide linear range, from 1.5 to 14 μM, with a limit of detection (LOD) of 0.85 μM. The PEC sensor is cost effective (each unit costs less than US$ 0.10), and its response was...

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