Emanation thermal analysis of TIXOTON (activated bentonite) treated with organic compounds

Bálek, V.; Málek, Z.; Ehrlicher, U; Györyová, K.; Matuschek, G.; Yariv, S.

doi:10.1016/s0169-1317(02)00091-1

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…The program may involve heating or cooling at a fixed rate of temperature change, or holding the temperature constant, or any sequences of these" [66,67]. Thermal analysis methods are usually associated to other techniques for the study of organoclays, such as thermo-IR spectroscopy analysis [68,69], thermo-XRD analysis [70], evolved-gas analysis [71] and differential-scanning calorimetry (DSC), and to a more recent technique called emanation thermal analysis (ETA) [72]. For these analyses, the organoclay material is gradually heated, usually under an inert gas atmosphere.…”

Section: Thermal Analysismentioning

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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Section: Thermal Analysismentioning

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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“…In the case of interaction with oxalic acid, the Al/Si ratio decreases to 0.32 for 1 M concentrations, which indicates some destruction of the octahedral sheet. In an acidic medium, the presence of hydrated protons in the interlayer space is undisputed (Balek et al, 2002;Ferrage et al, 2005). During the treatment, the interlayer NH 4 + cation was first exchanged by H 3 O + .…”

Section: Nature Of the Compensating Cation After Acid Treatmentmentioning

confidence: 99%

Interactions of ammonium smectite with low-molecular-weight carboxylic acids

Gautier¹,

Muller²,

Bény³

et al. 2009

Clay miner.

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AB ST R ACT : The percolation of water through waste landfill sites produces leachates with large amounts of pollutants. Clay barriers are often used to limit soil and underground water pollution. A better understanding of the interaction between ammonium smectite and carboxylic acids would contribute significantly to our understanding of such systems. The SWy-2 (Wyoming smectite) was exchanged with NH 4 + and then batched with carboxylic acids (acetic, formic, chloroacetic and oxalic) in concentrations between 0.01 M and 1 M. The solid phases obtained were analysed chemically and characterized by infrared absorption spectroscopy (IR) and powder X-ray diffraction (XRD). Ionic chromatography was used for the quantitative measurement of ammonium ions in the solution after the interaction. For the four acids, the interaction was characterized by a cationic exchange of NH 4 + to H 3 O + . A partial exchange to Al 3+ due to a partial dissolution of the sample in strong acidic medium was observed with chloroacetic and oxalic acids for which adsorption of molecules on the clay sample occurs, mainly through H-bonding with the cation. Moreover, the intercalation of oxalic acid in the interlayer space was highlighted.*

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“…[14][15][16]). These changes are considered [17][18][19][20] to occur via intermediate formation of amorphous meta-montmorillonite phase during later stages of water release taking place at above 650°C and leading to irreversible [21,22] collapse of interlayer space. Different heating rates can be induced in laser ablation (e.g.…”

Section: Introductionmentioning

confidence: 99%