Novel layered structured bentonite clay-based electrodes for electrochemical sensor applications

Vernekar, Pramod R.; Shetti, Nagaraj P.; Shanbhag, Mahesh M.; Malode, Shweta J.; Malladi, Ramesh S.; Reddy, Kakarla Raghava

doi:10.1016/j.microc.2020.105441

Cited by 54 publications

(16 citation statements)

References 49 publications

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“…The surface of the working electrode can be effectively modified by utilizing different modifiers such as surfactants, inorganic complexes, polymer conductors, metal-based nanoparticles, and clay particles [ 15 , 16 , 17 ]. This modified electrode involves an easy and less expensive preparation method, provides less background current in a wide range of potential windows and is very easy to adapt [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

An Electrochemical Electrode to Detect Theophylline Based on Copper Oxide Nanoparticles Composited with Graphene Oxide

et al. 2022

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The electrochemical analysis of theophylline (THP) was investigated by fabricating a carbon paste electrode (CPE) modified with graphene oxide (GO) along with copper oxide (CuO) nanoparticles (CuO-GO/CPE). The impact of electro-kinetic parameters such as the heterogeneous rate constant, the scan rate, the accumulation time, the pH, the transfer coefficient, and the number of electrons and protons transferred into the electro-oxidation mechanism of THP has been studied utilizing electrochemical methods such as cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The differential pulse voltammetry technique was employed to investigate THP in pharmaceutical and biological samples, confirming the limit of detection (LOD) and quantification (LOQ) of the THP. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were performed to characterize the CuO nanoparticles. The CuO-GO/CPE was more sensitive in THP detection because its electrocatalytic characteristics displayed an enhanced peak current in the 0.2 M supporting electrolyte of pH 6.0, proving the excellent sensing functioning of the modified electrode.

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Section: Introductionmentioning

confidence: 99%

An Electrochemical Electrode to Detect Theophylline Based on Copper Oxide Nanoparticles Composited with Graphene Oxide

et al. 2022

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“…Various analytical methods may be used for the determination of CTZ, among them: high performance liquid chromatography (HPLC) [ 5 , 6 , 7 ], liquid chromatography (LC) [ 8 , 9 ], spectrophotometry [ 10 , 11 ], capillary electrophoresis [ 12 , 13 ], and voltammetry [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Although the methods mentioned can be applied successfully in the determination of CTZ, some of them may suffer from several disadvantages.…”

Section: Introductionmentioning

confidence: 99%

“…The literature reports that CTZ was determined using voltammetric techniques and different types of solid electrodes: the boron-doped diamond electrode [ 19 ], the graphite pencil electrode [ 20 ], and the modified GCE [ 15 , 17 , 21 , 23 ] and CPE [ 14 , 16 , 18 , 22 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

New Electrochemical Sensor Based on Hierarchical Carbon Nanofibers with NiCo Nanoparticles and Its Application for Cetirizine Hydrochloride Determination

et al. 2022

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A new electrochemical sensor based on hierarchical carbon nanofibers with Ni and Co nanoparticles (eCNF/CNT/NiCo-GCE) was developed. The presented sensor may be characterized by high sensitivity, good electrical conductivity, and electrocatalytic properties. Reproducibility of its preparation expressed as %RSD (relative standard deviation) was equal to 9.7% (n = 5). The repeatability of the signal register on eCNF/CNT/NiCo-GCE was equal to 3.4% (n = 9). The developed sensor was applied in the determination of the antihistamine drug—cetirizine hydrochloride (CTZ). Measurement conditions, such as DPV (differential pulse voltammetry) parameters, supporting electrolyte composition and concentration were optimized. CTZ exhibits a linear response in three concentration ranges: 0.05–6 µM (r = 0.988); 7–32 (r = 0.992); and 42–112 (r = 0.999). Based on the calibration performed, the limit of detection (LOD) and limit of quantification (LOQ) were calculated and were equal to 14 nM and 42 nM, respectively. The applicability of the optimized method for the determination of CTZ was proven by analysis of its concentration in real samples, such as pharmaceutical products and body fluids (urine and plasma). The results were satisfactory and the calculated recoveries (97–115%) suggest that the method may be considered accurate. The obtained results proved that the developed sensor and optimized method may be used in routine laboratory practice.

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“…Moreover, recent advancements have reported studies on bentonite modi cation for adsorption applications. Various materials have been used as modi ers from organic to inorganic substrates, and a recent study has reported bentonite coated with iron oxide forming a bentonite composite, which was used to remove pollutants in aqueous media [5]. However, the limitations associated with bentonite-ba bentonite-based electrochemical sensors have relatively low sensitivity due to on-transfer capacity.…”

Section: Introductionmentioning

confidence: 99%

Bentonite Nanoclay Optoelectrochemical Property Improvement through Bimetallic Silver and Gold Nanoparticles

Ngcobo

Silwana

Maqhashu

et al. 2022

Journal of Nanotechnology

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This study assesses the physical and electrochemical changes of bimetallic Ag-Au nanoparticle-functionalized bentonite nanoclay. Nanoclay was studied to deduce a better sensing material/film. A chemical co-reduction method was used to synthesize bimetallic Ag-Au c nanoparticles, which were used to prepare a Ag-Au/PGV bentonite composite. Bimetallic Ag-AuNPs and their nanoclay composite were optically characterized using the scanning electron microscope, ultraviolet visible spectroscopy, X-ray diffraction, and Fourier transform infrared, whilst cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to ascertain their electrochemical activity and properties. The results of surface morphological inspection showed an average size of 10 nm, in agreement with XRD. The bimetallic Ag-AuNPs UV/Vis characteristic wavelengths of 414 nm and 516 nm confirmed the presence of Ag and Au metals, respectively. XRD exhibited diffraction planes related to 2θ values of Ag and Au metals, whilst FTIR indicated mainly COO- functional groups from the citrate capping of bimetallic Ag-Au NPs. CV and DPV showed that bentonite nanoclay is largely insulated by silicates but exhibited a small electroactivity of Fe. The electroactivity of Ag-Au/PGV bentonite exhibited peak potentials due to Ag/Ag+ and Au/Au3+ redox couples at 0.19 V/−0.20 V and 1.37 V/0.42, respectively. The Ag-Au/PGV bentonite nanocomposite exhibited the highest surface concentration of 3.25 × 10−2 cm2, a diffusion coefficient of 2.36 × −11 cm2/s, and an electron transfer rate constant (Ks) of 1.99 × 10−4 cm2. The outcome of these results indicated that the Ag-Au/PGV bentonite nanocomposite was more electroactive than PGV. Therefore, this study accentuates Ag-Au/PGV bentonite nanocomposite as a novel and promising platform for electrochemical sensing with higher sensitivity and efficiency than other sensing materials.

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Novel layered structured bentonite clay-based electrodes for electrochemical sensor applications

Cited by 54 publications

References 49 publications

An Electrochemical Electrode to Detect Theophylline Based on Copper Oxide Nanoparticles Composited with Graphene Oxide

An Electrochemical Electrode to Detect Theophylline Based on Copper Oxide Nanoparticles Composited with Graphene Oxide

New Electrochemical Sensor Based on Hierarchical Carbon Nanofibers with NiCo Nanoparticles and Its Application for Cetirizine Hydrochloride Determination

Bentonite Nanoclay Optoelectrochemical Property Improvement through Bimetallic Silver and Gold Nanoparticles

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