Mineralogical and physico-chemical characterizations of clay from Keur Saër (Senegal)

Mbaye, Abdou; Diop, Cheikh; Rhouta, Benaïssa; Brendlé, Jocelyne; Senocq, François; Maury, F.; Diallo, Dinna Pathé

doi:10.1180/claymin.2012.047.4.08

Cited by 5 publications

(4 citation statements)

References 25 publications

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“…Figure depicts the FTIR spectra of NC and different CAPB-NC samples. The absorption band at 3697 cm –1 is assigned to combined in-phase and out-of-phase stretching frequency of hydroxyl groups of kaolinite. , Bands around 3438 and 1625 cm –1 are attributed to adsorbed water stretching and bending vibration, respectively . The bands at 2970 and 2920 cm –1 are attributed to the asymmetric stretching vibration of C–C in the alkyl chain, while the bands at 2856 and 1390 cm –1 are attributed to the symmetric stretching and bending mode, respectively, of the same group. , The intense band at 1045 cm –1 with a shoulder at 1090 cm –1 is ascribed to perpendicular stretching vibrations of the Si–O–Si group, while the bands at 685 and 468 cm –1 are the bending mode of the same group. ,, Absorption bands at 920 and 534 cm –1 are ascribed to Al(IV)–OH and Si–O–Al(VI) stretching vibrations, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The absorption band at 3697 cm −1 is assigned to combined in-phase and out-of-phase stretching frequency of hydroxyl groups of kaolinite. 26,38 Bands around 3438 and 1625 cm −1 are attributed to adsorbed water stretching and bending vibration, respectively. 26 The bands at 2970 and 2920 cm −1 are attributed to the asymmetric stretching vibration of C−C in the alkyl chain, while the bands at 2856 and 1390 cm −1 are attributed to the symmetric stretching and bending mode, respectively, of the same group.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

2020

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In this study, natural clay (NC) was collected from Saudi Arabia and modified by cocamidopropyl betaine (CAPB) at different conditions (CAPB concentration, reaction time, and reaction temperature). NC and modified clay (CAPB-NC) were characterized using X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, and N2 adsorption at 77 K. The adsorption efficiency of NC and CAPB-NC toward Pb2+ and reactive yellow 160 dye (RY160) was evaluated. The adsorption process was optimized in terms of solution initial pH and adsorbent dosage. Finally, the adsorption kinetics and isotherms were studied. The results indicated that NC consists of agglomerated nonporous particles composed of quartz and kaolinite. CAPB modification reduced the specific surface area and introduced new functional groups by adsorbing on the NC surface. The concentration of CAPB affects the adsorption of RY160 tremendously; the optimum concentration was 2 times the cation exchange capacity of NC. The equilibrium adsorption capacity of CAPB-NC toward RY160 was about 6 times that of NC and was similar for Pb2+. The adsorption process followed the pseudo-second-order kinetics for both adsorptive. RY160 adsorption on CAPB-NC occurs via multilayer formation while Pb2+ adsorption on NC occurs via monolayer formation..

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

2020

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“…In the course of a general program aimed at the study of natural clay minerals and their applications (Bouna et al, 2010(Bouna et al, , 2011Mbaye et al, 2012), this paper reports the characteristics and properties of a natural clay from the Mako area in the southeastern part of Senegal. The clay fraction and organically modified derivatives were also investigated.…”

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Characterization of natural and chemically modified kaolinite from Mako (Senegal) to remove lead from aqueous solutions

et al. 2014

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The chemical and sorption properties of clay minerals from the Mako area, Senegal, were investigated using FTIR spectroscopy, X-ray diffraction, scanning electron microscopy equipped with an X-ray energy dispersion spectrometer, thermal analysis and chemical analysis. The clay sample is essentially dominated by kaolinite and quartz as also shown by treatment with ethylene glycol and dimethylsulfoxide (DMSO). The clay fraction of this natural clay was organically modified by grafting with 3-aminopropyltriethoxysilane (APTES) in order to improve significantly its retention ability of heavy metals. The silane groups of the APTES reagent were partly grafted on the surface of platy kaolinite particles and the remaining ethoxy groups could be hydrolysed by aqueous treatment. The natural clay, its clay fraction and the organo-functionalized clay (with APTES) were investigated as adsorbents for the removal of Pb(II) from aqueous solutions. Evidence for an organic grafting has been demonstrated by comparing the spectroscopic characteristics of the natural clay and those of its chemically modified derivatives. The effects of different parameters (i.e. initial Pb(II) concentration and contact time) on the adsorption efficiency were studied. For an initial concentration of 10 mg L−1Pb(II), the adsorption was maximized after 30 min contact time both for the raw material and its clay fraction and after 90 min for the APTES grafted clay. Although the maximum of sorption for the APTES grafted clay is reached with slower kinetics, this maximum amount of Pb(II) uptake at room temperature (Xmax) is significantly higher since it is 0.99 mg g−1for the raw clay, 1.46 mg g−1for its clay fraction and 3.02 mg g−1for the organically modified clay, i.e. three times greater than the raw clay.

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“…However, an obvious increase in the relative intensities of the absorption in the OH stretching region of organoclays between 3696 cm −1 -3425 cm −1 can be observed. The weak and sharp bands at 3696 cm −1 and 3420 cm −1 were assigned to the stretching vibrations of the surface and inner hydroxyl groups in kaolinite, respectively [48][49][50][51]. The former of two poorly resolved bands at 3530 cm −1 was assigned to the structural OH−stretching mode in largely disordered glauconite, while the later one at 3425 cm −1 was attributed to the OH−stretching of the interlayer and adsorbed water [49,50].…”

Section: Ft-ir Measurementsmentioning

confidence: 99%

Influence of Zwitterionic CAPB on Flocculation of the Aqueous Cationic Guar Gum/Glauconite Suspensions at Various pH

Godek

Grządka

Maciołek

et al. 2021

IJMS

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The influence of the pseudoamphoteric zwitterionic surfactant cocamidopropylbetaine (CAPB) on the stabilizing flocculating properties of the aqueous suspensions of glauconite (GT) with cationic guar gum (CGG) at various pH values was investigated. The following techniques were used: turbidimetry, UV-VIS spectrophotometry, tensiometry, electrophoretic mobility measurements, SEM, CHN, XRD, and FT-IR. It was established that CGG is an effective glauconite flocculant. Moreover, the most probable mechanism that is responsible for flocculation is bridge flocculation resulting from polymer adsorption on the glauconite surface. The adsorption process is caused by electrostatic interactions between the negatively charged glauconite surface and the positively charged polymer. The amount of CGG adsorption increases with the increase of the pH, which was confirmed by the adsorption and zeta potential measurements. The addition of CAPB increases the amount of the polymer adsorption due to the formation of intermolecular polymer–surfactant complexes; however, it reduces flocculation effectiveness.

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Mineralogical and physico-chemical characterizations of clay from Keur Saër (Senegal)

Cited by 5 publications

References 25 publications

Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

Characterization of natural and chemically modified kaolinite from Mako (Senegal) to remove lead from aqueous solutions

Influence of Zwitterionic CAPB on Flocculation of the Aqueous Cationic Guar Gum/Glauconite Suspensions at Various pH

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