Functionally anchored Ag-TiO2 nanoparticles on guar gum based nanocomposite for simultaneous determination of hydroquinone, catechol, resorcinol and nitrite

•Functionalized guar gum has well improved the redox process and enhances the significant conductivity.•HQ, CC, RC and NO2− biosensing with wide range detection.•Selective measurements in well water sample performed. Facile one pot synthesis of Ag-TiO2 (Silver-Titanium dioxide) with FGG (functionalized guar gum) is reported, involving simultaneous detection of HQ (Hydroquinone), CC (Catechol), RC (Resorcinol) and NO2 (Nitrite). Enriched electrochemical property, durability and high charge transfer ability of the designed composite demonstrated an excellent detection towards HQ, CC, RC and NO2− organic pollutants. FGG has well improved the redox process by providing more surface area through electrosteric interaction towards Ag-TiO2 nanomaterial and thus demonstrating more desirable electrocatalytic activity against environmental pollutants detection. The as-prepared Ag-TiO2/FGG nanocomposite modified electrode shows the linear range of 300 nM − 300 µM, 400 nM − 300 µM, 600 nM −300 µM and 800 nM – 300 µM with the detection limit 195.2 nM, 161 nM, 77.58 nM and 101 nM for HQ, CC, RC and NO2, respectively. The fabricated sensor displays intriguing application with good sensitivity, selectivity and reproducibility towards the quantification of pollutants. In practical, analytical utility provides greater capacity by selective measurements in well water with good recovery results paving hopeful future in healthcare applications.