Preparation and characterization of a novel hybrid hydrogel composite of chitin stabilized graphite: Application for selective and simultaneous electrochemical detection of dihydroxybenzene isomers in water
Abstract The development of new and robust sensors for real-time monitoring of environmental pollutants have received much attention. Therefore, in the present work, we have fabricated a simple and robust electrochemical sensor for the simultaneous electrochemical determination of dihydroxybenzene isomers using chitin (CHI) stabilized graphite (GR) hydrogel composite modified electrode. The GR-CHI hydrogel composite was prepared by a simple sonication of raw GR in CHI solution and the as-prepared materials were characterized by range of physicochemical methods. Compared with CHI and GR modified electrodes, the GR-CHI hydrogel composite modified electrode shows an excellent electron transfer ability and enhanced electrocatalytic activity towards hydroquinone (HQ), catechol (CC) and resorcinol (RC). Differential pulse voltammetry was used for the simultaneous determination of HQ, CC and RC. Under optimized conditions, the fabricated electrode detects the HQ, CC and RC in the linear response from 0.2 to 110.6μM, 0.3 to 110.6μM and 1.3 to 133.4μM, respectively. The detection limit for HQ, CC and RC were 0.065μM, 0.085μM and 0.35μM, respectively. The sensor shows its appropriate practicality towards the determination of HQ, CC and RC in different water samples. Highlights Simultaneous electrochemical determination of dihydroxybenzene isomers. Fabrication of a novel GR-CHI hydrogel composite. Lower LOD with enhanced sensitivity was obtained for simultaneous determination of dihydroxybenzene isomers. Practicality has been demonstrated in different water samples. Graphical abstract [DISPLAY OMISSION]
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