Analysis of tetramethylammonium–montmorillonite and retention of toluene from aqueous solution

Vidal, Nuria; Volzone, Cristina

doi:10.1016/j.clay.2009.06.013

Cited by 23 publications

(14 citation statements)

References 32 publications

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“…4. Similar values were reported by Volzone et al [17], Lee and Kim [18], Zhu et al [19], Vidal and Volzone [20], and Lagaly [21], after HDTMA + intercalation to different smectite types, according to different models proposed. The arrangement of an organic cation of long carbon chain, for example HDTMA + with respect to the sheet of clay mineral, would be located in monolayer when interlayer spacing are between 1.48 and 1.50 nm; in two successive layers (bilayer) when recorded interlayer spacing values between 1.78 and 1.88 nm; pseudotrilayer if d(001) values are between 1.89 and 1.94 nm and paraffine arrangement between 1.95 and 2.2 nm.…”

Section: Characterization Of Bentonites and Organo-bentonitessupporting

confidence: 88%

Adsorption of anionic dyes monoazo and diazo using organo-bentonites

Stagnaro

Volzone

2018

SN Appl. Sci.

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Adsorption of orange and yellow dyes, containing mono-and di-azoic groups, respectively, were studied by the use of a natural and organo-bentonites, which were obtained by treatment with hexadecyl-trimethyl-ammonium bromide (Br-HDTMA). Two different bentonites from Argentina were used. X-ray diffraction, UV-visible spectrometry, infrared spectrometry and thermal analysis were used for the characterizations. The results were interpreted by using isotherms that fit properly to the mathematical model of Langmuir. The structural and physicochemical properties of the clay, and the arrangement of hexadecyl-trimethyl-ammonium cation (HDTMA +) into the interlayer of the smectites, the main clay mineral composition of the bentonites, were responsible for the retention of dyes. The retention of the azo dyes not only increased with the HDTMA + modification of the bentonites but also depended on the clay mineral (smectite types) composition of the pristine bentonite.

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Section: Characterization Of Bentonites and Organo-bentonitessupporting

confidence: 88%

Adsorption of anionic dyes monoazo and diazo using organo-bentonites

Stagnaro

Volzone

2018

SN Appl. Sci.

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“…Similarly, based on DTA-TGA data, Vidal and Volzone (2009) reported that below 200°C tetramethylammoniummontmorillonite undergoes only dehydration; the dehydration peak is shifted in the organoclay as compared with original Ca-montmorillonite to lower temperatures. By applying DTA-TGA to organoclays formed with long-chain quaternary ammonium cations, Xie et al (2001) observed below 200°C only water loss.…”

Section: Organoclay Changes Due To Thermal Treatmentmentioning

confidence: 94%

“…1 and 2). In these spectroscopic regions the stretching and the deformation of C-H in organic compounds are detected whereas the OH, Si-O, Al-O and Mg-O vibrations of the clay framework, as well as those of Table 2 together with their assignments (Rao 1963;Parker and Frost 1996;Yapar 2009;Vidal and Volzone 2009) and relative intensities. It is seen in Figs.…”

Section: Organoclay Changes Due To Thermal Treatmentmentioning

confidence: 98%

Mild pre-heating of organic cation-exchanged clays enhances their interactions with nitrobenzene in aqueous environment

et al. 2010

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Aqueous sorption kinetics and equilibrium isotherms of nitrobenzene were studied on two series of sorbents that were prepared by (i) replacing inorganic exchangeable cations in Wyoming bentonite with tetraethylammonium (TEA) and benzyltrimethylammonium (BTMA) and (ii) heating synthesized complexes in air at different temperatures (between 150 and 420°C). The aim of this work was to examine recently observed enhancement of aqueous sorption of a probe organic sorbate on organoclays after mild thermal pre-treatment of sorbents. Thermal pretreatment of TEA-and BTMA-clays at 150°C results in the maximal enhancement of nitrobenzene-sorbent interactions as compared with treatment of original bentonite and its exchange complexes formed with long-chain quaternary ammonium (n-hexadecyltrimethylammonium, HDTMA). Based on C, N content data and FTIR spectra of TEAand BTMA-clay complexes, no indications of decomposition of organic matter were found in organoclays heated at 250°C (and below this temperature). Suppressed hydration of pre-heated sorbents resulting in a lessening of waterorganic sorbate competition for sorption sites is considered to be responsible for thermally induced enhancement of nitrobenzene-sorbent interactions. In the HDTMA-based organoclays, the long-chain aliphatic groups of the quaternary ammonium can additionally interact with clay surface thus competing with organic sorbate-sorbent surface inter-M. Borisover ( ) · N. Bukhanovsky actions and, in this way, mitigating the enhancement of nitrobenzene sorption on thermally treated sorbents.

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“…Caused by the notable difference in the properties of these components, it is relatively easy to identify independently the data corresponding to each component. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy, thermogravimetric analysis (TG), thermal differential analysis (DTA) and differential scanning calorimetry (DSC) techniques are widely used in the characterization of organoclays [3,[20][21][22][23][24][25][26]. Particularly the thermal techniques provide a wealth of information [5,[27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Characterization of hexadecyltrimethylammonium-organoclay and its individual components by thermal techniques

2017

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The properties of the materials determine their potential applications. The aim of this article is to study the properties of the organoclays using simple and rapid technologies. Organoclays with different surfactant loadings (SL) were synthesized using an Argentine bentonite with a high content of montmorillonite (Bent) and hexadecyltrimethylammonium bromide as cationic surfactant. The samples were characterized using thermal techniques. The results revealed that the hydrophilicity of the organoclays decreases with increasing SL until the SL reaches 0.8 times the cation exchange capacity of the clay; and remains constant at a higher surfactant load. The stability of organoclays was inversely proportional to the SL of each sample. The layers showed a stabilization of approximately 40 • C for their structural transformation temperature, caused by the presence of the surfactant. In addition, at a SL <1.0 the surfactant presented a 'liquid-like' structure in the interlayer space, whereas at a SL >1.0 the structure was 'solid-like'.

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Analysis of tetramethylammonium–montmorillonite and retention of toluene from aqueous solution

Cited by 23 publications

References 32 publications

Adsorption of anionic dyes monoazo and diazo using organo-bentonites

Adsorption of anionic dyes monoazo and diazo using organo-bentonites

Mild pre-heating of organic cation-exchanged clays enhances their interactions with nitrobenzene in aqueous environment

Characterization of hexadecyltrimethylammonium-organoclay and its individual components by thermal techniques

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