Chitosan anchored zinc oxide nanocomposite as modified electrochemical sensor for the detection of Cd(II) ions

Abstract

a b s t r a c tThe chitosan anchored zinc oxide nanocomposite (NC) has been prepared using chemical approach. The obtained NC was used as modified electrode for selective detection of Cd(II) ions using square wave voltammetry under pH 6 phosphate buffer solution. Surface area and porous nature of NC were found by using Brunauer-Emmett-Teller isotherm analysis. The presence of functional groups was confirmed using Fourier transform infrared spectroscopic analysis. The results indicated that detection starts at 30 s with least concentration along with rise in peak current and optimized potential at 0.6 V. Upon increasing the ionic concentration, intensity of the current peaks decreases due to strong porous nature of the obtained product disturbing electron transport. Under optimal conditions, the calibration plot for Cd(II) is found to be linear with concentration range of 0.2-1.5 μM and also compared with calibration plot with accumulation time. Combining the high surface area, more active sites, and reduction in particle size the absorption ability toward Cd(II) ions was found to be fast and sensitive with limit of detection 1.39 nM. Hence, the obtained product shows adequate sensing drive and it can also be used for real-time analysis.

Facile hydrothermal bio‐synthesis of cellulose acetate templated CuS nanorods like fibres: antibacterial, cytotoxicity effects and DNA cleavage properties against A549 lung cancer cells

“…2 b cellulose templated extract mediated CuS NPs depicts the lower crystallinity with decreased crystallite size. The size of the crystallite was found to be in the range of 24.3–9.7 nm which was calculated Debye‐Scherrer formula [14]. A careful examination of XRD spectrum of extract mediated CuS NPs reveals that intensities of diffraction peaks were lower than non‐extract mediated CuS NPs.…”

An Efficient High-Powered Sulfamethaxazole Sensor Based onp–nJunction Heterostructures Using Nanostructured ZnO Thin Film and Graphene Oxide Sheets

“…In this research work, the preparation of graphene oxide (GO) was performed as reported earlier, using a modified Hummer’s method. Previously, ZnO has been prepared using wet chemical method, which was reported earlier in our works. , In this work, the process for rapidly growing ZnO nanorods is developed using a hydrothermal technique and was described in the following section. To prepare ZnO/FTO electrode, substrate 2 (FTO) was dip-coated with ZnO sol to obtain a seed layer, using 0.05 M zinc acetate in ethanol.…”

Evaluation of Cytotoxicity and Apoptotic behavior of Cerium Oxide/Zinc Oxide/ Graphene Oxide in HeLa and VERO cell Lines

“…In a recent article, we described the procedure for making CeO 2 nano-particles and CeO 2 /GO hybrid nanocomposite (28). ZnO nanoparticle was prepared by using simple wet chemical route in which 1.2 g of Zinc acetate dihydrate was stirred along with 0.4 g of sodium hydroxide (41). Further, 1 g of CeO 2 NPs powder was diluted in 100 ml distilled water and ultrasonically processed for 30 minutes.…”