Characterization and Applications of Kaolinite Robustly Grafted by an Ionic Liquid with Naphthyl Functionality

Dedzo, Gustave Kenne; Detellier, Christian

doi:10.3390/ma10091006

Cited by 12 publications

(3 citation statements)

References 42 publications

(56 reference statements)

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“…Ionic liquids can be produced with a variety of cations and anions. Most of the ILs used for MMT modification have cations based on imidazolium, pyridinium, and pyrrolidinium ions [18,19]. Certainly, the presence of IL organic cations in the MMT structure increases the hydrophobicity of the mineral clay, and makes it suitable for absorbing organic substances as pollutants [11,20].…”

Section: Introductionmentioning

confidence: 99%

Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites

et al. 2019

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Composites of montmorillonite K10 (MMT K10) and ionic liquid (IL) containing a 1-butyl-3-methyl-imidazolium cation ([BMIm]+) and various anions, such as bis (trifluoromethylsulfonyl) imide ([NTf2]−), trifluoromethanesulfonate ([OTf]−), and dicyanamide ([DCA]−) have been obtained in this work. A number of methods, such as dynamic light scattering (DLS), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermal gravimetry (TG), differential scanning calorimetry (DSC), Fourier-transform infrared (FTIR) spectroscopy, and nitrogen adsorption–desorption have been used to characterize clay, and to study the structure and thermal behaviour of the composites. It has been found that the MMT K10 powder has a narrow particle size distribution with a peak at 246 nm and a mesoporous structure (SBET=195 m2/g). According to the FTIR spectra, MMT K10/IL interaction depends on the IL type. It has been identified that confined ionic liquid interacts with both clay and adsorbed water in accordance with the hydrophilicity and size of the anion, in the following order: [DCA]− > [OTf]− > [NTf2]−. Characteristic temperatures of glass transition, crystallization, and melting have been determined for the ionic liquids under study and their MMT K10 composites. It has been revealed that when IL is adsorbed on the surface of clay, the phase transitions in IL change. The greatest changes are observed in the case of BMImNTf2. By applying the method of thermogravimetric analysis, it is shown that composite formation is accompanied by a decrease in the IL thermal stability. Apparently, the highly developed surface of montmorillonite K10, obtained by acid treatment, plays a major role in the decrease in the IL’s thermal stability. The influence of the IL anion on the thermal and spectral characteristics of an MMT K10/IL composite was studied for the first time.

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Section: Introductionmentioning

confidence: 99%

Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites

et al. 2019

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“…To prepare the kaolinite/quaternary ammonium salts intercalation compounds (K-Qas), approximately 1 g of methoxy-modified kaolinite was added into a 20 mL of 1 mol/L solution of quaternary ammonium salts in methanol and stirred under room temperature for 72 h. The precipitations were centrifuged and the excess quaternary ammonium salt was removed by washing six times with fresh ethanol. Then the resulting products were dried at 80 • C for 24 h. The dried products were denoted as K-Qa-C n (n = 4,6,8,10,12,14,16,18). To prepare the kaolinite/fatty acid intercalation compounds (K-Fas), a 1 mol/L solution of fatty acid in water was prepared at 80 • C firstly; 2 g of wet methoxy-modified kaolinite was added into 20 mL of the prepared solution and stirred for 72 h at the same temperature.…”

Section: Preparationmentioning

confidence: 99%

“…Kaolinite is a widely studied and applied class of phyllosilicate minerals [1][2][3][4][5][6]. Because of its specific physical and chemical properties, it has been used as a pigment for coatings, a filler for paper and polymers, an extender for water-based paints and inks, and a major component of ceramics [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Intercalation Agents on Morphology of Exfoliated Kaolinite

et al. 2017

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Kaolinite intercalation compounds were prepared by intercalating fatty acids and quaternary ammonium salts into kaolinite layers, using methanol-grafted kaolinite as the precursor. Meanwhile, massive lamellas were exfoliated during the intercalation process. The interlayer structure, chemical bonding and morphology of kaolinite before and after intercalation were characterized in detail. As the alkyl chain length increases, the basal spacing of kaolinite increases gradually. The morphology analysis indicated that the ionic type of intercalation agent has a more important influence on the morphology change of kaolinite than their alkyl chain length. The initial kaolinite layers were mostly transformed into nanoscrolls in the product intercalated with stearyl trimethyl ammonium chloride (STAC). The present study demonstrates the arrangement model of intercalated molecules between kaolinite layers using X-ray diffraction (XRD) in conjunction with Fourier transform infrared (FTIR) and stereochemical calculation. On the basis of a probed arrangement model, the mechanism of effect of the alkyl chain length and ionic type of intercalation agent on the morphology of exfoliated kaolinite is suggested.

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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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Characterization and Applications of Kaolinite Robustly Grafted by an Ionic Liquid with Naphthyl Functionality

Cited by 12 publications

References 42 publications

Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites

Structural and Thermal Properties of Montmorillonite/Ionic Liquid Composites

Effect of Intercalation Agents on Morphology of Exfoliated Kaolinite

Kaolinite Clay Mineral Reactivity Improvement through Ionic Liquid Functionalization

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