Sensitive Amperometric Determination of Thiocyanates at Ionic Liquid Nanohybrid Kaolinite Modified Glassy Carbon Electrode

Nguelo, Bruno Boniface; Dedzo, Gustave Kenne; Tonlé, Ignas Kenfack; Detellier, Christian; Ngameni, Emmanuel

doi:10.1002/elan.201700821

Cited by 17 publications

(8 citation statements)

References 46 publications

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“…The detection limit (3S/N) is estimated to be 3.0×10 −6 mol L −1 . Compared with previously reported modified electrodes for thiocyanate determination (Table ), the proposed CTAB‐CNTs/GCE shows a linear range close to iron phthalocyanine‐linked 4‐mercaptopyridine/Au and kaolinite‐ionic liquids/GCE , but higher detection limit. Although Nano‐Ag/CNTs/GCE and Gold nanoparticles/CNTs/CPE obviously exhibit better sensing performances, they use noble metal nanomaterials which increase the detection cost.…”

Section: Resultsmentioning

confidence: 64%

“…As can be seen, a broad anodic peak appears at ca. 1.0 V on the bare GCE, attributed to the oxidation of thiocyanate, which can be described by the following reaction :

true 2 SCN^{-} \to NCS - SCN + 2 e^{-}

…”

Section: Resultsmentioning

confidence: 99%

“…Nguelo et al. have modified a glassy carbon electrode with a series of pyridinium ionic liquids based kaolinite to develop an electrochemical sensor for detection of thiocyanate in human saliva samples.…”

Section: Introductionmentioning

confidence: 99%

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Voltammetric Behaviors and Determination of Thiocyanate on Multiwalled Carbon Nanotubes‐Cetyltrimethylammonium Bromide Modified Electrode

Xie

Zhang

2018

Electroanalysis

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Electrochemical behaviors of thiocyanate on three carbon nanotubes (CNTs) composites modified glass carbon electrode (GCE) were studied. The modified electrodes were prepared with CNTs suspended in aqueous solutions of chitosan (CHT), poly(diallyldimethylammonium chloride) (PDDA) and cetyltrimethylammonium bromide (CTAB), respectively. The results indicated that CNTs‐CTAB enhanced the voltammetric response of thiocyanate more remarkably than other two CNTs composites. Then, the voltammetric behaviors of thiocyanate on CNTs‐CTAB/GCE were investigated systematically to develop an electrochemical sensor for thiocyanate determination. The solution pH, supporting electrolyte, amount of CNTs‐CTAB suspension, and accumulation time were optimized. Under optimum conditions, the anodic peak current on CNTs‐CTAB/GCE increased linearly with increasing the thiocyanate concentration from 5.0×10−6 to 1.0×10−4 mol L−1. The proposed CNTs‐CTAB/GCE was demonstrated to provide a fast and low‐cost approach to monitoring the adsorptive removal of thiocyanate with layered double hydrotalcite (LDH).

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Section: Resultsmentioning

confidence: 64%

“…As can be seen, a broad anodic peak appears at ca. 1.0 V on the bare GCE, attributed to the oxidation of thiocyanate, which can be described by the following reaction :

true 2 SCN^{-} \to NCS - SCN + 2 e^{-}

…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Voltammetric Behaviors and Determination of Thiocyanate on Multiwalled Carbon Nanotubes‐Cetyltrimethylammonium Bromide Modified Electrode

Xie

Zhang

2018

Electroanalysis

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“…The anion exchange capacity provided by the IL functionalized kaolinite thin film casted onto the working electrode significantly reduced the detection limit of the sensors. On the other hand, the organophilic character of para‐substituted substituents were used for the removal of 2,4‐D, a commonly used pesticide with high toxicity …”

Section: Modification Of Kaolinite By Ilsmentioning

confidence: 99%

“…On the other hand, the organophilic character of parasubstituted substituents were used for the removal of 2,4-D, a commonly used pesticide with high toxicity. [58,59]…”

Section: Intercalation and Grafting Of Pyridinium Ilsmentioning

confidence: 99%

Kaolinite Clay Mineral Reactivity Improvement through Ionic Liquid Functionalization

Dedzo

2018

Israel Journal of Chemistry

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Since the intercalation of 1‐ethylpyridinium chloride in the interlayer space of kaolinite in 2005, several other ionic liquids (ILs) have been successfully intercalated. Unlike other clay minerals that display charged structural units, kaolinite is almost neutral. ILs intercalation in kaolinite results in both the cation and the anion in the interlayer space. The confinement of ILs in this two‐dimensional polarized space is of numerous interests, with certainly the most important to be discovered. Moreover, kaolinite interlayer space is decorated by a dense network of hydroxyl functions that can be easily functionalized. Recent study demonstrates that it is possible to synthesize ILs from simple organic molecules whose cations can be permanently grafted into the interlayer space of kaolinite. This review presents the results obtained in kaolinite functionalization by ILs, by focusing on the synthesis, applications and potential perspectives offered by these new nanohybrid materials.

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Catalytic Detection of Iodide at Cationic Kaolinite Modified Gold Electrode in Presence of Thiosulfate

et al. 2020

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A gold electrode modified by a thin film of cationic kaolinite was used for the electrochemical detection of iodide in aqueous solution in the presence of thiosulfate. At gold electrode, iodide showed two electrochemical systems in the potential range explored (0.10 V to 0.85 V). The pH‐independent system was assigned to the redox couple I2/I− and the pH‐dependent one assigned to the redox couple HIO/ . For increased amount of thiosulfate the oxidation peak intensity of the first system increases sharply followed by the gradual decrease of the reduction peak, due to the chemical reaction between thiosulfate and oxidized iodide. The calibration curve in the presence of excess thiosulfate resulted in an increase of the sensitivity by a factor of 7. To improve this sensitivity, the bare gold electrode was coated by a thin film of an anionic exchanger kaolinite, obtained by grafting the ionic liquid (1‐(2‐hydroxyethyl)‐4‐(tert‐butyl) pyridinium chloride). Accumulation‐detection method yielded a spectacular increase of the oxidation peak current of iodide in the presence of thiosulfate ions. At optimized experimental conditions, a sensitivity of 2.45 μA.μM−1 and a detection limit of 65 nM were obtained. The method was successfully applied for total iodine determination in povidone−iodine formulation.

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Sensitive Amperometric Determination of Thiocyanates at Ionic Liquid Nanohybrid Kaolinite Modified Glassy Carbon Electrode

Cited by 17 publications

References 46 publications

Voltammetric Behaviors and Determination of Thiocyanate on Multiwalled Carbon Nanotubes‐Cetyltrimethylammonium Bromide Modified Electrode

Voltammetric Behaviors and Determination of Thiocyanate on Multiwalled Carbon Nanotubes‐Cetyltrimethylammonium Bromide Modified Electrode

Kaolinite Clay Mineral Reactivity Improvement through Ionic Liquid Functionalization

Catalytic Detection of Iodide at Cationic Kaolinite Modified Gold Electrode in Presence of Thiosulfate

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