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

Ngameni, Emmanuel; Tonlé, Ignas Kenfack; Apohkeng, J. T.; Bouwé, R. G. B.; Jieumboué, A. T.; Walcarius, Alain

doi:10.1002/elan.200603654

Cited by 32 publications

(20 citation statements)

References 71 publications

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“…34 The same trend was observed either with KDN or MDN film electrodes, in agreement with previous report dealing with [Fe(CN) 6 ] 3-, a similar probe examined at a smectite-type clay also functionalized by APTES and coated on a glassy carbon electrode. 35 Finally, when the [Ru(CN) 6 ] 4-exchanged film obtained upon saturation was rinsed with water and transferred to a solution containing only the supporting electrolyte (free from [Ru(CN) 6 ] 4-), the peak current was found to decrease continuously upon multisweep potential scanning (Figure 8b). A reverse ion exchange of [Ru(CN) 6 ] 4-for the electrolyte anions (Cl -) is the phenomenon involved.…”

Section: Resultsmentioning

confidence: 98%

Nanohybrid Kaolinite-Based Materials Obtained from the Interlayer Grafting of 3-Aminopropyltriethoxysilane and Their Potential Use as Electrochemical Sensors

et al. 2007

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The grafting of 3-aminopropyltriethoxysilane (APTES) onto the internal aluminol groups of two kaolinite minerals from Georgia and from Cameroon was achieved by utilizing their corresponding dimethyl sulfoxide (DMSO) intercalation compounds as intermediates. The modified clays were characterized by powder X-ray diffraction, thermal gravimetric analysis coupled with mass spectrometry, Fourier transform infrared, and solid-state MAS NMR. These techniques demonstrated the effectiveness of the interlamellar grafting process. An expansion of the interlayer distance from 11.2 to 15.9-16.4 Å on going from the precursors to the nanohybrid materials was observed. The study of the thermal behavior of the organoclays showed the release under heating of grafted APTES fragments, typical of the decomposition products of carbon, hydrogen, and nitrogen bearing organic matter. The hydroxyl stretching vibration zone (3700-3600 cm -1 ) of the starting clays and of the DMSO intercalated precursors was intensively perturbed in the final materials. New bands were observed, indicating strong interactions between APTES and the kaolinite interlayer surfaces. Solid-state 29 Si CP-MAS NMR spectra of silylated kaolinite showed T 2 and T 3 signals corresponding to the linkage of APTES moieties. This was confirmed by the relative intensities of the signals in the quantitative 13 C CP-MAS NMR spectra of the nanohybrid materials. Concomitant silylation and ethoxylation of the interlayer aluminol surface were obtained to give a mixed alkoxy-organosilyl kaolinite derivative. The silylation was roughly equally distributed between bidentate and tridentate fixations, with a minor amount of monodentate material. A remarkable feature of the new materials was their response to the [Ru(CN) 6 ] 4-electrochemical probe in acidic medium when the functionalized clays were coated on a platinum electrode. This is due to the protonated amine groups that act as anion exchange sites. These preliminary results open the way to further development of kaolinite-based electrochemical sensors.

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Section: Resultsmentioning

confidence: 98%

Nanohybrid Kaolinite-Based Materials Obtained from the Interlayer Grafting of 3-Aminopropyltriethoxysilane and Their Potential Use as Electrochemical Sensors

et al. 2007

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“…For example, smectite grafted with propylamine groups exhibited a higher ability to accumulate [Fe(CN) 6 ] 3− anions in acidic media due to protonation of amine groups. Following these studies, ion exchange properties of the same clay mineral was before and after its modification by intercalation of HDTMA evaluated for the uptake of [Ru(NH 3 ) 6 ] 3+ and [Fe(CN) 6 ] 3− ions used as redox probes [208]. By thoroughly examining key experimental parameters affecting the incorporation of the probes within the film (ionic strength, surfactant loading and the nature of supporting electrolyte), the ion exchange processes occurring at the electrode were highlighted.…”

Section: Current [Mp] / μMmentioning

confidence: 99%

Organoclay-modified electrodes: preparation, characterization and recent electroanalytical applications

Tonlé

Ngameni

Tchieno

et al. 2015

J Solid State Electrochem

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Amperometric sensors dedicated to the determination of pollutants and other compounds of interest face daily a great challenge: the development of sensitive, reproducible and low-cost devices allowing fast analyses. This review deals with the beneficial role and application of organoclays exploited as sensing materials in various fields of electroanalysis, for the past 15 years (period 2000-2014). After a description of different preparation methods leading to clay minerals chemically modified by organic compounds, the common methods used for their characterization are exposed; then, their application as electrode modifiers is described, covering several approaches that were developed to enhance either the sensitivity or the selectivity of the indexed organoclay-based sensors. Finally, a brief description of voltammetric methods frequently used for electroanalytical purposes is given, followed by an update of recent and salient results achieved for the detection of inorganic and organic electroactive compounds or ions.

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“…Indeed, the reduction of 4 is weak on the modified electrode due to unfavorable electrostatic interactions between the negatively charged clay particles and . The signals observed around -0.25 and 0.25 V for 4 on the clay modified electrode (Figure 5(b)) could be explained by the presence of cracks or fissures on the film during the drying step of the preparation of this electrode [31]. These results clearly demonstrate the advantage of combining smectite clay and permanganate in the determination of paraquat.…”

Section: Electrochemical Behavior Of Paraquat In the Presence Of Kmnomentioning

confidence: 73%

Electrocatalytic and Sensors Properties of Natural Smectite Type Clay towards the Detection of Paraquat Using a Film-Modified Electrode

Tcheumi¹,

Tonlé²,

Walcarius³

et al. 2012

AJAC

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In this study, a low-cost and sensitive voltammetric method was developed for the determination of paraquat (PQ2+). This was achieved by coating a glassy carbon electrode with a purified fraction of a smectite-type clay, which was then used to accumulate paraquat by an ion exchange process. The electronanalytical procedure involves two steps: the chemical preconcentration of paraquat under open-circuit conditions in an aqueous medium, followed by the voltammetric detection of the preconcentrated pollutant in a medium containing permanganate ions which significantly improved through its catalytic action the electrode response. A systematic study of the experimental conditions (pH of the accumulation and detection media, permanganate concentration in the detection medium, clay content of the coating, potential and duration of the electrolysis step) on the stripping response were examined in detail. After optimization, a linear calibration curve for paraquat was obtained in the concentration range from 1.6 to 2.8 µM, leading to a detection limit of 3.8 × 10–9 mol·L–1 (S/N = 3). The proposed method was successfully applied to the determination of paraquat in spring water

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

Cited by 32 publications

References 71 publications

Nanohybrid Kaolinite-Based Materials Obtained from the Interlayer Grafting of 3-Aminopropyltriethoxysilane and Their Potential Use as Electrochemical Sensors

Nanohybrid Kaolinite-Based Materials Obtained from the Interlayer Grafting of 3-Aminopropyltriethoxysilane and Their Potential Use as Electrochemical Sensors

Organoclay-modified electrodes: preparation, characterization and recent electroanalytical applications

Electrocatalytic and Sensors Properties of Natural Smectite Type Clay towards the Detection of Paraquat Using a Film-Modified Electrode

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