ChemInform Abstract: The Voltammetric Response of Zeolite‐Modified Electrodes

Shaw, Brenda R.; Creasy, Kenneth E.; Lanczycki, Christopher J.; Sargeant, Jeffrey A.; Tirhado, Marta

doi:10.1002/chin.198831017

Cited by 18 publications

(37 citation statements)

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“…The alteration of peak potential indicated that the metal complex is encapsulated inside the zeolite matrix and not present on the external surface. If there is any drastic decrease in peak currents for zeolite modified electrode, then the electron transfer occurs via extra-zeolite mechanism [32][33][34]. It was observed that CV of the encapsulated complex showed no decrease in peak currents, found to be independent of scan rate and was stable over an extended period of time without any change in redox potential values (Fig.…”

Section: Electrochemical Studiesmentioning

confidence: 99%

Zeolite-Y encapsulated VO[2-(2′-hydroxyphenyl)benzimidazole] complex: investigation of its catalytic activity towards oxidation of organic substrates

2016

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Zeolite-Y encapsulated VO(IV)2-(2 0 -hydroxyphenyl)benzimidazole (ohpbmzl) was synthesized by flexible ligand approach and characterized using various physico-chemical techniques such as elemental analysis, XRD, inductively coupled plasma-atomic emission, fourier transform infrared spectroscopy, UV-vis-diffuse reflectance and electron paramagnetic resonance spectroscopy, thermogravimetric analysis, BET surface area and cyclic voltammetry (CV). Based on the results a square pyramidal structure was suggested for the encapsulated complex. Shift in UV absorbance to higher wavelength and variations in the redox potential values compared to the nonencapsulated complex in CV confirmed the successful encapsulation of the complex in the zeolite matrix. The catalytic efficacy was investigated towards oxidation of phenol, styrene, cyclohexane and ethyl benzene in acetonitrile using H 2 O 2 as oxidant. Influence of reaction parameters like catalyst and substrate concentration, substrate/H 2 O 2 molar ratio, and temperature were investigated to optimize the reaction conditions for maximum substrate conversion and selectivity towards desired products using the encapsulated complex. The catalytic activity was compared with vanadyl exchanged zeolite-Y (VO-Y) and non-encapsulated complex. The encapsulated complex retained its stability up to 3 runs as confirmed by recycling studies. Mechanistic pathways were proposed for all the probe reactions.

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Section: Electrochemical Studiesmentioning

confidence: 99%

Zeolite-Y encapsulated VO[2-(2′-hydroxyphenyl)benzimidazole] complex: investigation of its catalytic activity towards oxidation of organic substrates

2016

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“…The electrochemical properties of the ZMEs were tested by reproducing the cyclic voltammetry (CV) experiment of Shaw et al [13] for a zeolite-Y polystyrene electrode, using Cu 2+ as the probe species. For the experiment ZMEs were obtained by the traditional method of dropwise coating a bare Pt electrode with polystyrene in methylene chloride-zeolite Y suspension, which was subsequently dried.…”

Section: Reagentsmentioning

confidence: 99%

“…The novel properties of ZMEs of analyte preconcentration, ion exchange and ion-selectivity based on size, shape, and charge selectivity of zeolites have made them not only extensively studied, but widely used in electroanalysis and electrocatalysis [2][3][4][5][6][7][8][9]. Several extensive reviews of preparation methods [10,11], the use of ZMEs with various electrochemical probes, the influence of supporting electrolyte, the molecular and electronic transfers, the solid state chemistry, and other numerous applications have been described [12][13][14]. There also has been much progress in understanding the importance of ion change and intrazeolite electron transfer and transport of ZMEs [12,15,16].…”

Section: Introductionmentioning

confidence: 99%

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Carbon ceramic electrode incorporated with zeolite ZSM-5 for determination of Piroxicam

2010

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Abstract:A new chemically modified electrode is constructed based on carbon ceramic electrode incorporated with zeolite ZSM-5. Voltammetric behavior of piroxicam at the carbon ceramic zeolite modified electrode (CCZME) was investigated. The modified electrode exhibited catalytic activity toward the electrooxidation of piroxicam. Experimental parameters such as solution pH, scan rate, concentration of piroxicam and zeolite amount were studied. It has been shown that using the CCZME, piroxicam can be determined by differential pulse voltammetry (DPV) and hydrodynamic amperometry (HA). Under the optimized conditions the calibration plots are linear in the concentration ranges of 0.20-25.00 and 0.20-50.10 μM with limit of detections of 0.65 and 0.29 μM for DPV and HA, respectively. The modified electrode with DPV and HA methods was successfully applied for analysis of piroxicam in pharmaceutical formulations. The results were favorably compared to those obtained by the spiked method. The results of the analysis suggest that the proposed method has promise for the routine determination of piroxicam in the products examined.

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“…For analytical applications, it is highly desirable to develop robust modified electrodes that can be prepared easily and reproducibly. Additionally, by using a suitable modifier, it is desirable to improve sensitivity, detection limit and selectivity [40]. In the present work, we have attempted to improve the response characteristics of the Co-Z by incorporating the modifier in carbon-paste matrix.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Amperometric Sensor for Hydrogen Peroxide by Using a Carbon Paste Electrode Modified with Cobalt Impregnated Zeolite

Norouzi¹,

Moradian²,

Malekan³

2015

Port. Electrochim. Acta

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Cobalt impregnated zeolite-modified electrode was prepared by mixing cobalt-zeolite (Co-Z) and graphite powder with different percentages. Using the cyclic voltammetric technique, the electrochemical oxidation of hydrogen peroxide at such electrodes was investigated. Experiments on zeolite show that it is not electrochemically active towards hydrogen peroxide oxidation in NaOH solution. The presence of cobalt ions in the zeolite matrix, by soaking the electrode in an aqueous Co(NO 3 ) 2 solution, markedly enhances the electrocatalytic activity which was found to depend on the cobalt content. On the other hand, the presence of zeolite and/or Co metals in the catalyst is essential; however, the electro-catalytic activity depends on different percentages of Co-Z. Under the selected conditions, the anodic peak current was linearly dependent on the concentration of the hydrogen peroxide in the range 0.03-9 and 0.006-0.1 mM with CV and amperometric methods, respectively. The detection limits (S/N=3) were also estimated to be 17 and 2.5 µM.

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ChemInform Abstract: The Voltammetric Response of Zeolite‐Modified Electrodes

Cited by 18 publications

References 1 publication

Zeolite-Y encapsulated VO[2-(2′-hydroxyphenyl)benzimidazole] complex: investigation of its catalytic activity towards oxidation of organic substrates

Zeolite-Y encapsulated VO[2-(2′-hydroxyphenyl)benzimidazole] complex: investigation of its catalytic activity towards oxidation of organic substrates

Carbon ceramic electrode incorporated with zeolite ZSM-5 for determination of Piroxicam

An Efficient Amperometric Sensor for Hydrogen Peroxide by Using a Carbon Paste Electrode Modified with Cobalt Impregnated Zeolite

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