One-step co-intercalation of cetyltrimethylammonium and thiourea in smectite and application of the organoclay to the sensitive electrochemical detection of Pb(II)

Ngassa, Guy B. P.; Tonlé, Ignas Kenfack; Walcarius, Alain; Ngameni, Emmanuel

doi:10.1016/j.clay.2014.07.014

Cited by 29 publications

(24 citation statements)

References 49 publications

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“…Apparently, the process is not indicated for fibrous clay minerals such as sepiolite. Recently, it was reported that an alkylammonium (cetyltrimethylammonium, CTA + ) ion and the neutral thiourea molecule could be coinserted by a one-step mechanism within montmorillonite [28]. Two features were thus exploited for the preparation of such an organoclay: the partial displacement of sodium ions previously introduced in the interlayer space of the clay mineral and the coinsertion of thiourea molecules within the alkyammonium sheets lying flat as monolayer or bilayer between the clay sheets (Scheme 1).…”

Section: Intercalation or Insertion (Class 2)mentioning

confidence: 99%

“…The OCME was then applied to the anodic stripping square wave voltammetric analysis of metal ions after accumulation at open circuit giving rise to detection limits as low as 3.6×10 −8 M for copper and 7.2×10 −8 M for cadmium. Organoclays prepared by one-step co-intercalation of cetyltrimethylammonium ions (CTA + ) and thiourea in various amounts within the interlayer region of smectite were used as electrode material for the detection of Pb(II) [28]. The electrochemical features and permeability properties of the organoclays, coated as thin films onto the surface of a glassy carbon electrode (GCE), were first characterized through ion exchange multisweep cyclic voltammetry.…”

Section: Current [Mp] / μMmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Intercalation or Insertion (Class 2)mentioning

confidence: 99%

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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“…Clay minerals have been shown to be among the best materials for modifying conventional electrode surfaces. Of these, the smectite group are the most commonly used [6,14,25,[26][27][28][29][30]. Kaolinite is much more abundant in nature than smectites and has the ability to form covalent bonds with organic compounds via the hydroxyl groups on the inner and outer surfaces of clay mineral.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Organophilic Nanohybrid Kaolinite and Application to the Electrochemical Detection of Organic Pesticide

2017

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Novel organophilic nanohybrid materials (K‐TDD) were obtained by the grafting of 1,2‐tetradecanediol (TDD) onto the surface of kaolinite (K). XRD, IR, TGA‐DTG, and SEM characterization showed that TDD grafting results in a partial exfoliation of kaolinite layers. This material was used to modify a glassy carbon electrode (GCE/K‐TDD) and applied for the trace analysis of methyl parathion (MP). The signal of MP recorded on GCE/K‐TDD was more intense compared to the unmodified GCE or to one modified with a film of natural kaolinite. Several parameters that can affect the stripping response were systematically investigated to optimize the sensitivity of the organokaolinite‐modified electrode. A linear calibration curve for MP was obtained in the concentration range from 2×10−6 to 14×10−6 mol .L−1 in acetate buffer (pH 6), giving a detection limit of 9×10−8 mol .L−1. The sensitivity of the method was found to be 2.42 μA/μM for the range of concentrations that gives a linear calibration curve. The electrode was shown to be very stable, with the electrochemical response of MP decreasing by only 1.5 % after a series of nine measurements. The interference of various inorganic ions and organic compounds likely to influence the stripping determination of the MP were also examined. The results showed that the GCE/K‐TDD electrode was effective in solutions containing interfering species and could be applied for the quantification of MP pesticide in natural water.

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“…In fact, clay-based nanohybrid materials offer a wide range of applications in environmental protection [4][5][6][7][8], in catalysis [9][10], in polymer science [11][12] and in analytical electrochemistry [13][14][15][16]. In the last-mentioned application, composite materials derived from the modification of kaolinite [17][18] and smectite [19][20][21][22][23] as precursors are the most investigated, probably because these types of clay possess a layered structure favorable to intercalation processes and grafting reactions. At the opposite, the implication of fibrous clay minerals for electroanalytical purposes is scarce, although many works in literature have been devoted to their chemical modification [24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Nanohybrid materials from amine functionalization of sepiolite: Preparation, characterization and application as electrode modifiers for the electroanalytical detection of heavy metal ions

Ymélé¹,

Sherman²,

Francis³

et al. 2017

Adv Mater Sci

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Sepiolite-based organic-inorganic hybrid materials bearing amine groups were prepared by chemical grafting using 3-aminopropyltriethoxysilane (APTES) and [(3-(2-aminoethylamino)propyl)]trimethoxysilane (AEPTMS). The structural properties of the pristine sepiolite and the obtained composites materials were analysed using XRD, TG/DTA analysis and FTIR. The surface ion exchange ability of the functionalized clay minerals coated as thin film on glassy carbon electrodes and exposed to [Ru(NH 3 ) 6 ] 3+/2+ or [Fe(CN) 6 ] 3−/4-electroactive probes was also investigated by multisweep cyclic voltammetry (MSCV) and by Electrochemical impedance spectroscopy (EIS). From MSCV data, it was found that sepiolite and organosepiolites display a permselective behavior depending on the charge on its surface while EIS results showed that the functionalization of sepiolite enhanced its conductivity. The organosepiolites were tested in a comparative way for the voltammetric detection of mercury (II), and some preliminary experiments based on differential pulse voltammetry highlighted the interest of using the most sensitive organoclay (i.e. the sample grafted by AEPTMS) for the electroanalysis of several heavy metals in the same solution.

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One-step co-intercalation of cetyltrimethylammonium and thiourea in smectite and application of the organoclay to the sensitive electrochemical detection of Pb(II)

Cited by 29 publications

References 49 publications

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

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

Preparation of Organophilic Nanohybrid Kaolinite and Application to the Electrochemical Detection of Organic Pesticide

Nanohybrid materials from amine functionalization of sepiolite: Preparation, characterization and application as electrode modifiers for the electroanalytical detection of heavy metal ions

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