Reduced graphene oxide supported raspberry-like SrWO4 for sensitive detection of catechol in green tea and drinking water samples

• Published in: Journal of the Taiwan Institute of Chemical Engineers Vol. 89; pp. 215 - 223
• Main Authors: Manavalan, Shaktivel, Govindasamy, Mani, Chen, Shen-Ming, Rajaji, Umamaheswari, Chen, Tse-Wei, Ajmal Ali, M., Al-Hemaid, Fahad M.A., Elshikh, M.S., Abul Farah, M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2018
• Subjects: Electroanalysis; Food analysis; Modified electrode; Reduced graphene oxide; Strontium tungstate; Water safety; Strontium tungstate; Electroanalysis; Reduced graphene oxide; Water safety; Food analysis; Modified electrode
• ISSN: 1876-1070; 1876-1089
• DOI: 10.1016/j.jtice.2018.05.001

•Roseberry like rGOSs@SrWO4 composite was synthesized by hydrothermal method.•The rGOSs@SrWO4 exhibit an excellent sensing performance for catechol.•The modified electrode has high sensitivity, low detection limit for catechol detection.•The modified sensor was successfully applied in green tea and drinking water samples. The raspberry-like strontium tungstate microspheres supported on reduced graphene oxide nanosheets (rGOSs@SrWO4) were prepared by a hydrothermal method and it was applied to the electrocatalytic sensing of catechol. The as-prepared rGOSs@SrWO4 composite was characterized by XRD, Raman, FESEM, EDX, EIS, and voltammetric techniques. Morphology studies reveal the uniform wrapping of raspberry-like SrWO4 microstructure by thin sheets of rGOSs and the composite possesses large surface area and abundant catalytic active sites. The rGOSs@SrWO4 composite modified screen-printed multi-conventional electrode (SPME) was fabricated which was found to exhibit extraordinary electrocatalytic activity and excellent selectivity towards the detection of catechol. The rGOSs@SrWO4/SPME displayed a linear range of 0.034–672.64 µM and detection limit of 7.34 nM using differential pulse voltammetry as signal read-out. Furthermore, the electrode was durable, reproducible and repeatable. The practical utility of the method was demonstrated in green tea and drinking water samples. [Display omitted]