Kaolinite–urea complexes obtained by mechanochemical and aqueous suspension techniques—A comparative study

Makó, Éva; Kristóf, János; Horváth, Erzsébet; Vágvölgyi, Veronika

doi:10.1016/j.jcis.2008.10.054

Cited by 114 publications

(68 citation statements)

References 38 publications

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“…The major difference between the FTIR spectra of ZK and ZK-U is the appearance of the bands at 3498, 3410 and 3387 cm −1 and the weakening of the 3694 cm −1 band (as compared to the 3620 cm −1 band) in the case of ZK-U, which indicate hydrogen bonding between urea molecules and the tetrahedral sheets of kaolinite. These stretching vibrations of kaolinite-U complexes have been discussed in previous studies [26,28,38]. In …”

Section: Ftir Spectroscopic Analysissupporting

confidence: 55%

“…The differential thermogravimetric (DTG) curve of the untreated kaolin (Fig. 2, ZK) shows two mass losses at 59 °C and 560 °C, which are related to the loss of the adsorbed water and the dehydroxylation of kaolinite, respectively [26,41]. Heating the dried methanol-treated kaolin (ZK-U-Me(airdry)), two mass losses were observed again.…”

Section: Thermal Analysismentioning

confidence: 99%

“…The high-grade Zettlitz kaolin (ZK) [26,41] was used, which contains 91 wt% of kaolinite with a Hinckley index (HI) [44] of around 0.8. Analytical grade urea (U), methanol (Me), and cetyltrimethylammonium chloride (CTAC) were used as intercalating reagent from SigmaAldrich, Scharlab, and Alfa Aesar, respectively.…”

Section: Samples and Intercalation Proceduresmentioning

confidence: 99%

“…3. In the spectrum of the untreated kaolin (ZK), the vibration bands at 3694, 3670, and 3654 cm −1 belong to the inner surface hydroxyl groups and the fourth band at 3620 cm −1 belongs to the inner hydroxyl group [22,26,28,38,63]. The major difference between the FTIR spectra of ZK and ZK-U is the appearance of the bands at 3498, 3410 and 3387 cm −1 and the weakening of the 3694 cm −1 band (as compared to the 3620 cm −1 band) in the case of ZK-U, which indicate hydrogen bonding between urea molecules and the tetrahedral sheets of kaolinite.…”

Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

“…To our knowledge, the preparation of kaolinite-CTAC complex using U as precursor was not published before. Direct intercalation of U into kaolinite was carried out using solution [1,2,4,8,9,16,20,26,28,34,37,38], mechanochemical (co-grinding) [13, 21-23, 25-28, 31, 32, 37], and homogenization [41] techniques. These techniques resulted in high degree of intercalation, but the mechanochemical and homogenization techniques require less time and consume an order of magnitude less chemicals.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of kaolinite-cetyltrimethylammonium chloride intercalation complex synthesized through eco-friend kaolinite-urea pre-intercalation complex

Makó

Kovács

Katona

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Because of its suitability for producing kaolinite nanoscrolls, the kaolinitecetyltrimethylammonium chloride intercalation complex is of interest in the research area of kaolinite nanocomposites. Experimental and molecular simulation analyses are used to investigate this intercalation complex, revealing its real structure formed through partially methoxy-modified kaolinite. Cost-efficient homogenization method is applied to synthesize the eco-friend kaolinite-urea pre-intercalation complex, which was found to be favorable to intercalate cetyltrimethylammonium chloride into the interlayer space of kaolinite. The influence of the pre-intercalated urea molecules, the partial modification of kaolinite structure with methoxy groups, and the presence of methanol molecules in the interlayer space of kaolinite on the intercalation of cetyltrimethylammonium chloride is characterized experimentally by X-ray diffraction, thermal analysis, Fourier transform infrared spectroscopy, and electron microscopy. The kaolinite-cetyltrimethylammonium chloride complex is identified at the basal spacing of 3.82 nm with the chemical formula of Al 2 Si 2 O 5 (OH) 3.7 (OCH 3 ) 0.3 (CTAC) 1.6 (Me) 1.6 . Our molecular simulations predict methanolcontaining structures between methoxy-functionalized kaolinite layers with diffuse guest molecular arrangements. ________________________________________________________________

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Section: Ftir Spectroscopic Analysissupporting

confidence: 55%

Section: Thermal Analysismentioning

confidence: 99%

Section: Samples and Intercalation Proceduresmentioning

confidence: 99%

Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characterization of kaolinite-cetyltrimethylammonium chloride intercalation complex synthesized through eco-friend kaolinite-urea pre-intercalation complex

Makó

Kovács

Katona

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Intercalation of Lamellar Mineral Kaolinite with 2‐Picolinic Acid: Facile Preparation, Crystal Structure Optimization, and Proton Conductivity

et al. 2015

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Kaolinite intercalated with 2-picolinic acid was prepared and characterized by scanning electron microscopy, powder Xray diffraction, infrared spectroscopy, and thermogravimetric analysis. The proton conductivity (σ) of the material is 1.85 ϫ 10 -10 S cm -1 at 353 K and gradually increases to 1.7 ϫ 10 -7 S cm -1 at 393 K under N 2 (anhydrous environment) with an activation energy of E a = 1.93 eV, whereas σ =[a] State Key

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Low‐Cost and Environmental‐Friendly Kaolinite‐Intercalated Hybrid Material Showing Fast Formaldehyde Adsorbing Behavior

et al. 2016

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Formaldehydeis a widespread used chemical and its toxicity and volatility threaten seriously human health. Although the active carbon is a cheap and frequently used material for adsorption of formaldehyde indoor or inside new car, the physical adsorption needs too long time and the adsorbed formaldehyde is finally released in air. Herein we report an indeed lowcost and environmental-friendly formaldehyde adsorbent, which is made from the mineral kaolinite intercalated with natural amino acid L-a-alanine (the intercalated compound is ab-breviated as K-Ala). The hybrid K-Ala was characterized by elemental analysis for C, H and N; thermogravimetric, infrared spectroscopy and powder x-ray diffraction. Interestingly, the saturate adsorption is reached within six hours with the maximum adsorption amount of 45.6 milligram HCHO per gram of K-Ala compared with commercial activated carbons that the adsorption capacity increase more than five times (7.62 mg/g). On the basis of DFT calculations, the mechanism is analyzed for the quick adsorption of formaldehyde.

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Kaolinite–urea complexes obtained by mechanochemical and aqueous suspension techniques—A comparative study

Cited by 114 publications

References 38 publications

Characterization of kaolinite-cetyltrimethylammonium chloride intercalation complex synthesized through eco-friend kaolinite-urea pre-intercalation complex

Characterization of kaolinite-cetyltrimethylammonium chloride intercalation complex synthesized through eco-friend kaolinite-urea pre-intercalation complex

Intercalation of Lamellar Mineral Kaolinite with 2‐Picolinic Acid: Facile Preparation, Crystal Structure Optimization, and Proton Conductivity

Low‐Cost and Environmental‐Friendly Kaolinite‐Intercalated Hybrid Material Showing Fast Formaldehyde Adsorbing Behavior

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