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The reutilization of waste and the reduction of the general environmental impact of every production are fundamental goals that must be achieved in the framework of a circular economy. Recycled carbon-rich materials may represent a promising alternative to other less-sustainable carbonaceous materials used in the production of electrochemical sensing platforms. Herein, we propose an innovative carbon paste electrode (CPE) composed of biochar derived from biological sludge obtained from municipal and industrial wastewater treatment plants. The physicochemical properties of the biochar after a chemical treatment with an acidic solution obtained from industrial by-products were investigated. The electrode surface characterization was carried out by analyzing common redox probes and multiple phenols bearing varying numbers of –OH and –OCH 3  groups in their structure. Furthermore, the CPE was also tested on the evaluation of the phenolic fingerprints of  Vaccinium myrtillus ,  Vaccinium uliginosum  subsp.  gaultherioides , and  Fragaria  ×  ananassa . Standard anthocyanin mixtures and extracts of the aforementioned fruits were analyzed to provide a phenolic characterization of real samples. The obtained results show that the sewage sludge–derived biochar can be a promising material for the development of electroanalytical sensors. Graphical abstract

Electrochemical sensors based on sewage sludge–derived biochar for the analysis of anthocyanins in berry fruits