Solid-state NMR and FTIR studies of lime stabilized montmorillonitic and lateritic clays

Eisazadeh, Amin; Kassim, Khairul Anuar; Nur, Hadi

doi:10.1016/j.clay.2012.05.006

Cited by 129 publications

(60 citation statements)

References 20 publications

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“…The characteristic vibrational bands of Na-MMT at 3468 and 1638 cm -1 are attributed to stretching and bending of OH groups, respectively. The characteristic absorbance bands at 1032, 915 and 519 cm -1 are assigned to bending vibrations of Si-O-Al (octahedral Al), Al-Al-OH and Si-O-Si, respectively (Eisazadeh et al 2012;Neppalli et al 2014). The spectrum of PAAm shows two bands at 3436 and 2924 cm -1 , which are due to the N-H stretching vibration of the NH 2 group and C-H stretching vibrations.…”

Section: Characterization Of Paam-g-st/mmt Hydrogelsmentioning

confidence: 99%

“…Also, the observation of the surface morphology of PAAm-g-St and PAAm-g-St/MMT (Fig. 5c, d) indicates after incorporation with MMT, the fibrillar structure of PAAm-g-St was converted to coherent and near co-continuous morphology in PAAm-g-St/MMT (Eisazadeh et al 2012). In addition, the presence of Mg (magnesium) and Si (silica) in the EDX spectrum (as shown in Fig.…”

Section: Characterization Of Paam-g-st/mmt Hydrogelsmentioning

confidence: 99%

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Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Singh

Mahto

2017

Pet. Sci.

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In this paper the suitability of a graft polymer nanocomposite hydrogel system for enhanced oil recovery was examined using polyacrylamide graft starch/clay nanocomposite (a laboratory synthesized product) and chromium (III) acetate (crosslinker). X-ray diffraction analysis, Fourier transform infrared spectrometry analysis, field-emission scanning electron microscopy and transmission electron microscopy were carried out to reveal the laboratory synthesized product as a nanocomposite. The effects of various parameters like salt concentration, pH, temperature, polymer concentration and crosslinker concentration on the properties of the developed gel system were systematically evaluated. The thermal stability of the nanocomposite gel and the conventional gel system were also determined by thermogravimetric analysis. The graft polymer nanocomposite gel system exhibited acceptable gel strength, gelation time and gel stability compared with the conventional gel system. The nanocomposite gels prepared using a low crosslinker concentration showed higher gel strength and required longer gelation time than the conventional gel which is more desirable properties for the effective placement of gel during enhanced oil recovery operations. In addition, sand pack flooding experiments show that the graft polymer nanocomposite gels had better plugging capacity than the conventional gel systems under reservoir conditions. Hence, this gel system may be suitable in the water shutoff treatments required for enhanced oil recovery from oilfields.

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Section: Characterization Of Paam-g-st/mmt Hydrogelsmentioning

confidence: 99%

Section: Characterization Of Paam-g-st/mmt Hydrogelsmentioning

confidence: 99%

Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Singh

Mahto

2017

Pet. Sci.

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“…On the other hand, re-using these materials after stabilization is vital to minimize the cost and environmental impact of construction works. The stabilization of the problematic soils is commonly achieved by mixing them with water and lime or Portland cement and has been thoroughly studied for a long time (Diamond and Kinter, 1965;Choquette et al, 1987;Locat et al, 1990;Verhasselt, 1990;Bell, 1996;Al-Mukhtar et al, 2010;Kavak and Baykal, 2012;Pomakhina et al, 2012;Eisazadeh et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Influence of hydrated lime on the surface properties and interaction of kaolinite particles

Chemeda

Deneele

Christidis

et al. 2015

Applied Clay Science

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“…Similarly, a pair of IR bands centred around 695 cm −1 and 795 cm −1 is due to the quartz Si-O vibrations. Similarly, a vibration peak at 753 cm −1 corresponds to Si-O deformation [26,27]. A broad peak at 3420 cm −1 belongs to the OH stretching of H-bonded water molecule(s).…”

Section: Characterization Of Hybrid Materialsmentioning

confidence: 99%

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

Zirlianngura

Tiwari

et al. 2017

Metals

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Due to health and pollution concerns of aquatic environments related to the presence of heavy metal toxic ions, the necessity of developing devices able to detect and to monitor such kinds of species has recently gained importance. Carbon paste electrodes (CPEs) a starting approach to obtain new ion-selective devices by supporting materials like bentonite and/or clay; which become sensitive to lead(II) when they are suitably modified by chemical treatments to obtain different hybrid materials. In this work, two natural clays and three different hybrid materials were produced and then were characterized by X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy to assess their physico-chemical properties. After this stage, the electrochemical characterization of the modified CPEs using hybrid materials was performed by cyclic voltammetry, using the standard Fe(CN) 6 4− /Fe(CN) 6 3− redox couple. Subsequently, this study performed electrochemical experiments on lead(II) containing solutions, to test the ability of the examined CPEs to detect this toxic ion present in very low amounts. Lead(II) exhibited a reversible two electron oxidation/reduction behaviour in the cyclic voltammetry analyses and a reasonably good linear behaviour of the current associated with the oxidation peak as a function of its concentration (5.0-40.0 µg/L). The detection limit was found to vary in the range of 3-5 µg/L for the different modified CPEs. The presence of several co-existing ions showed that an interference variation had occurred. These results, therefore, show a restriction of the selectivity of the electrode up to a certain extent in the lead(II) detection. Finally, tap water with spiked lead(II) was analyzed to verify the suitability of the electrodes in the low level detection of lead(II) from real matrix samples.

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Solid-state NMR and FTIR studies of lime stabilized montmorillonitic and lateritic clays

Cited by 129 publications

References 20 publications

Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Synthesis, characterization and evaluation of polyacrylamide graft starch/clay nanocomposite hydrogel system for enhanced oil recovery

Influence of hydrated lime on the surface properties and interaction of kaolinite particles

Efficient Use of Porous Hybrid Materials in a Selective Detection of Lead(II) from Aqueous Solutions: An Electrochemical Study

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