Reactivity of ionic liquids with kaolinite: Melt intersalation of ethyl pyridinium chloride in an urea-kaolinite pre-intercalate

Letaı̈ef, Sadok; Elbokl, Tamer A.; Detellier, Christian

doi:10.1016/j.jcis.2006.06.008

Cited by 94 publications

(91 citation statements)

References 42 publications

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“…The 29 Si MAS-NMR spectrum of kaolinite ( Figure 4a) displays two well resolved signals at -90.9 and -91.4 ppm attributed to the existence of two different but equally populated silicon sites. Similar results have been reported in several studies 27,28 . According to Thompson and Barron1 27 , the interlayer hydrogen bonding resulting in two different silicon environments is the main reason for the 29 Si MAS-NMR signal splitting in kaolinite.…”

Section: Starting Materialssupporting

confidence: 93%

Nucleation and growth process of sodalite and cancrinite from kaolinite-rich clay under low-temperature hydrothermal conditions

2013

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The synthesis of low-silica zeotypes by hydrothermal transformation of kaolinite-rich clay and the nucleation and growth processes of sodalite and cancrinite in the system Na 2 O-Al 2 O 3 -SiO 2 -H 2 O at 100 °C were investigated. The synthesis products were characterized by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), 29 Si and 27 Al Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) and thermogravimetric analysis (TGA). Our data show that the sequence of the transformation of phases is: Poorly crystalline aluminosilicate → zeolite LTA → sodalite → sodalite + cancrinite → cancrinite. Synthesized materials appeared stable thermodynamically under the experimental conditions, with zeolite LTA (a metastable phase) occurring as a minor phase, compared with the presence of sodalite and cancrinite.

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Section: Starting Materialssupporting

confidence: 93%

Nucleation and growth process of sodalite and cancrinite from kaolinite-rich clay under low-temperature hydrothermal conditions

2013

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“…The FTIR technique can be performed with an infrared spectrum of absorption, emission and photoconductivity or Raman scattering of a solid, liquid or gas. [13,19,20] The morphology of kaolinite structure before and after dry grinding was studied by SEM. To investigate the dissolved urea which diffuses out from the barriers, the X-ray diffraction (XRD) pattern of urea-kaolinite with chitosan 6% was investigated before and after 30 days immersion in water.…”

Section: Characterization Of Selected Urea-kaolinite Fertilizer With mentioning

confidence: 99%

“…[11] The intercalation of kaolinite by urea has been studied in numerous works. [12][13][14][15][16] However, the previous studies have focused only on the intercalation of urea as the guest molecule between the clay nanolayers rather than on the nitrogen release behaviour.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder

Roshanravan

Soltani

Rashid

et al. 2015

Chemical Speciation & Bioavailability

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The use of controlled release fertilizer (CRF) has become a new trend to minimize environmental pollution. In this study, urea-kaolinite containing 20 wt% urea after one hour dry grinding was mixed with different concentrations of chitosan as a binder to prepare nitrogen-based CRF. Fourier transform infrared spectroscopy confirmed the hydrogen bonding between urea and kaolinite. Covalent interaction between urea-kaolinite and chitosan make the granules stronger. The nitrogen release was measured in 5 days interval using a diacetylmonoxime calorimetric method at a wavelength of 527 nm. The results illustrated that by increasing the chitosan concentration from 3 to 7.5%, nitrogen release decreased from 41.23 to 25.25% after one day and from 77.31 to 59.27% after 30 days incubation in water. Compressive stress at break tests confirmed that granules with chitosan 6% had the highest resistance and were chosen for ammonia volatilization tests. Ammonia volatilization was carried out using the forced-draft technique for a period of 10 weeks. The results showed that the total amount of ammonia loss for conventional urea fertilizer and urea-kaolinite-chitosan granules was 68.63 and 56.75%, respectively. This controlled release product could be applied in agricultural crop production purpose due to its controlled solubility in the soil, high nutrient use efficiency and potential economic benefits.

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“…Its purification was done according to previously published procedures [21,24,25], and experiments were conducted on the < 2 mm clay fraction recovered upon sedimentation.…”

Section: Clay Materials and Chemicalsmentioning

confidence: 99%

Square Wave Voltammetric Determination of Lead(II) Ions Using a Carbon Paste Electrode Modified by a Thiol‐Functionalized Kaolinite

et al. 2010

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This work reports the electroanalysis of lead(II) in aqueous medium, using a carbon paste electrode modified by a novel thiol-functionalized clay. This later was obtained upon the grafting of 3-chloropropyltriethoxysilane onto the interlayer surfaces of kaolinite, followed by the substitution under carefully controlled conditions of chloro by thiol groups. The raw kaolinite, its dimethylsulfoxide (DMSO) intercalate used as starting material and the resulting hybrids were characterized by X-ray diffraction, thermal analysis, infrared spectroscopy and CHNS elemental analysis. These techniques demonstrated the displacement of DMSO by the organosilane molecules which were grafted on the internal hydroxyl groups located on the kaolinite surface. The final functionalized kaolinite, with approximate chemical formula Si 4 Al 4 O 10 (OH) 6 [O 2 Si(OEt)(CH 2 ) 3 SH] was evaluated as electrode modifier for lead(II) sensing. A two-step analytical procedure based on the accumulation at open circuit-detection was applied by square wave voltammetry. Various parameters affecting both the two steps were optimized: a linear response to lead(II) was obtained in the concentration range from 3 10 À7 to 10 À5 M, with a detection limit estimated at 6 10 À8 M. The interfering effect of some ions likely to influence the stripping determination of lead(II) ions was evaluated, and the proposed method applied to a real sample.

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Reactivity of ionic liquids with kaolinite: Melt intersalation of ethyl pyridinium chloride in an urea-kaolinite pre-intercalate

Cited by 94 publications

References 42 publications

Nucleation and growth process of sodalite and cancrinite from kaolinite-rich clay under low-temperature hydrothermal conditions

Nucleation and growth process of sodalite and cancrinite from kaolinite-rich clay under low-temperature hydrothermal conditions

Enhancement of nitrogen release properties of urea–kaolinite fertilizer with chitosan binder

Square Wave Voltammetric Determination of Lead(II) Ions Using a Carbon Paste Electrode Modified by a Thiol‐Functionalized Kaolinite

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