Montmorillonite face surface associated tris(bipyridine)chromium(3+) monitored electrochemically

Fitch, Alanah; Lavy-Feder, Adina; Lee, Samuel A.; Kirsh, Mary T.

doi:10.1021/j100334a035

Cited by 48 publications

(33 citation statements)

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“…It will be first examined how the presence of Na-Sa and HDTMA-Sa films onto the electrode surface would influence its response to redox probes either positively or negatively charged. As expected, the two probes ([Ru(NH 3 ) 6 ] 3þ and [Fe(CN) 6 ] 3À ) gave rise to well defined reversible cyclic voltammograms at a bare glassy carbon electrode (Fig. 2).…”

Section: Physicochemical Characterization Of the Modifiedsupporting

confidence: 79%

“…This work aims at providing useful information about the sorption processes of [Ru(NH 3 ) 6 ] 3þ and [Fe(CN) 6 ] 3À at a surfactant-intercalated clay modified electrode. This will be achieved via the utilization of multisweep cyclic voltammetry technique to investigate the effect of many parameters such as the ionic strength, the film surfactant loading and the pH of the supporting electrolyte, on the permeability and preconcentration behavior of the modified electrode.…”

Section: Introductionmentioning

confidence: 99%

“…K 3 Fe(CN) 6 (> 99%) and Ru(NH 3 ) 6 Cl 3 were obtained respectively from Prolabo and Alfa. NaCl (> 99.5%), KCl (99%), KNO 3 (99%), NaOH, NaNO 3 (99.5%) and HCl (37%) were purchased from Prolabo.…”

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confidence: 99%

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Permselective and Preconcentration Properties of a Surfactant‐Intercalated Clay Modified Electrode

et al. 2006

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This work is focused on the voltammetric examination of the ion exchange properties of a smectite type clay, before and after its modification by the replacement of its native interlamellar cations (Na) by hexadecyltrimethylammonium cations (HDTMA þ ). The raw clay and its organically modified form were first characterized by X-ray diffraction (XRD) and N 2 adsorption -desorption isotherms (BET method) that confirmed the modification via an intercalation process. These materials were subsequently coated onto glassy carbon surfaces, and the resulting modified electrodes were evaluated for the uptake of [Ru(NH 3 ) 6 ] 3þ and [Fe(CN) 6 ] 3À ions used as redox probes. Some experimental parameters affecting the incorporation of the probes within the film, including the ionic strength, the surfactant loading and the solution pH are thoroughly examined, in order to highlight the mechanism of the process. The possibility of using the surfactant-intercalated clay modified electrode as an electrochemical sensor for [Fe(CN) 6 ] 3À is also evaluated.

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Section: Physicochemical Characterization Of the Modifiedsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

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Permselective and Preconcentration Properties of a Surfactant‐Intercalated Clay Modified Electrode

et al. 2006

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“…The largest signal is obtained by drying 1 pL of a 5 g/L suspension on the electrode. This results in a dry film thickness of 0.3 p m [9]. Increasing the thickness of the film causes a decrease in the maximum current observed.…”

Section: A) Ku(nhand+ Is Excluded From the Interlayer Regionmentioning

confidence: 99%

A clay‐modified electrode for ion‐exchange voltammetry

Wielgos

Fitch

1990

Electroanalysis

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Clay modified electrodes are characterized and optimized for their analytical use in ion-exchange voltammetry using Ru(NH&' as a test ion. The effect of electrolyte concentration on the conductivity of the film, the time for signal development, the amount of clay coating, and rinsing procedures are investigated. The linear range of the clay-modified electrode was found to be four orders of magnitude, and 100 pmol of the complex were sensed.

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“…Although smectites are electrochemically inactive, it has been reported that the metal complexes adsorbed into a clay film are active electrochemically (Gosh & Bard, 1983). Since then, many reports have appeared on the application of clay-modified electrodes (Fitch, 1990;Fitch & Lee, 1993;Itaya & Bard, 1985;Ege et al, 1985;Lee & Fitch, 1990;Fitch et al 1988;Rong et al, 1990;Kaviratna & Pinnavaia, 1992;Gobi et al, 1994;Labbe et al, 1994;Fitch & Krzysik, 1994;Xiang & Villemure, 1994;Mousty et al, 1994;Shen et al, 1994). The detailed mechanisms at the electrodes, however, remain to be clarified.…”

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confidence: 99%

Clay-modified electrodes prepared by the Langmuir-Blodgett method

et al. 1997

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An ion-exchange adduct of saponite with tetra-n-decylammonium cation ((n-decyl)aN +) was prepared and dispersed in chloroform. The material was spread on a water surface to form a thin film at the air-water interface. From the measurements of surface pressure vs. area, it was concluded that the film consisted of the very thin layer which was a mixture of singleand double layers of saponite adduct. A clay-modified electrode was prepared by depositing the film on a glassy carbon substrate using the Langrnuir-Blodgett method. When the electrode was soaked in an aqueous solution of [Fe(phen)3](C104)2 (phen = 1,10-phenanthroline), (n-decyl)4N § cations were replaced by [Fe(phen)3] 2+ ions from solution. This process was followed by measuring the cyclic voltammogram.The smectite group of clay minerals are layered materials with characteristic ion-exchange properties and the ability to incorporate molecules in the interlayer space. Although smectites are electrochemically inactive, it has been reported that the metal complexes adsorbed into a clay film are active electrochemically (Gosh & Bard, 1983). Since then, many reports have appeared on the application of clay-modified electrodes (

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Montmorillonite face surface associated tris(bipyridine)chromium(3+) monitored electrochemically

Cited by 48 publications

References 1 publication

Permselective and Preconcentration Properties of a Surfactant‐Intercalated Clay Modified Electrode

Permselective and Preconcentration Properties of a Surfactant‐Intercalated Clay Modified Electrode

A clay‐modified electrode for ion‐exchange voltammetry

Clay-modified electrodes prepared by the Langmuir-Blodgett method

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