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 110.6 µM, 0.3 to 110.6 µM and 1.3 to 133.4 µM, respectively. The detection limit for HQ, CC and RC were 0.065 µM, 0.085 µM and 0.35 µM, respectively. The sensor shows its appropriate practicality towards the determination of HQ, CC and RC in different water samples.

A robust nitrobenzene electrochemical sensor based on chitin hydrogel entrapped graphite composite

“…Whereas, pure graphene and graphite shows the diffraction peaks at 26.44 and 26.38°. The result clearly demonstrates that the CHI was firmed attached on CR surface and the edges were grafted like graphene [17].…”

“…Recently, we have reported that carbohydrate polymers entrapped GR has higher electron transfer ability than pristine GR and its performances have been found similar to graphene analogous [15][16][17]. For instance, the β-cyclodextrin, chitosan and chitin (CHI) stabilized GR has showed enhanced electrocatalytic activity and high surface area than GR and its electrochemical behaviors have found similar to graphene-CHI composite [17]. Hence, in the present work we have used GR-CHI composite for sensitive and low level detection of NB.…”

“…The GR-CHI composite was prepared by our previously reported method [17]. Briefly, the stable CHI solution was first prepared by adding CHI (5 mg mL -1 ) into the 5% acetic acid with the aid of sonication.…”

“…Hence, different modifications or pretreatments has been used to improve the electrochemical properties and selectivity of GR [11,14]. Recently, we have reported that carbohydrate polymers entrapped GR has higher electron transfer ability than pristine GR and its performances have been found similar to graphene analogous [15][16][17]. For instance, the β-cyclodextrin, chitosan and chitin (CHI) stabilized GR has showed enhanced electrocatalytic activity and high surface area than GR and its electrochemical behaviors have found similar to graphene-CHI composite [17].…”

Biosynthesis and Characterization of Zinc Sulphide Nanoparticles Using Leaf Extracts of Tridaxprocumbens

“…The nanotechnology has beenremarkable development in the synthetic methodologies have been developed to various nanoparticles of shape, size, dimensions and so on [1][2] . For instance, various types of nanoparticles (NPs)are available such as metal NP 3 , carbon based nanomaterials [4][5][6][7] , and polymers 8 , mostcommonly nanoparticles are synthesis through chemical methods 9 , sol-gel processing 10 , co-precipitation, and electro deposition method 11 . Zinc sulphide has been found highly attractive because of its remarkable application potential in solar cells, piezoelectric devices, UV-vis absorbers, pharmaceutical and cosmetic industries 12 .…”