Organo-bentonites with improved cetyltrimethylammonium contents

Kooli, Fethi

doi:10.1180/claymin.2014.049.5.05

Cited by 6 publications

(10 citation statements)

References 38 publications

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“…However, the up take amount was unchanged. Similar data were obtained for another type of clay mineral with low cation exchange capacity (CEC) [ 34 ].…”

Section: Resultssupporting

confidence: 75%

“…For all the materials, the basal spacing of treated materials (1.43 nm) at temperatures higher than 250 °C was higher than the basal spacing of the pristine PG treated at the same temperature (1.24 nm). This variation was related to the presence of the residual carbon materials between the clay sheets [ 25 , 34 ]. These data are in good accordance with the TGA data, which was presented in Table 4 .…”

Section: Resultsmentioning

confidence: 99%

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Removal Properties of Anionic Dye Eosin by Cetyltrimethylammonium Organo-Clays: The Effect of Counter-Ions and Regeneration Studies

et al. 2018

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The organo-clays (OCs) were prepared by a cation exchange reaction between surfactant (cetyltrimethylammonium, C16TMA) from different counterions (Bromide, Chloride, and Hydroxide). The effect of the counterions was investigated on the physico-chemical properties of the prepared organo-clays. The highest uptake of organic cations (1.60 mmol/g) was achieved using cetyl trimethylammonium bromide solution and the lowest value (0.93 mmol/g) was obtained after modification with cetyl trimethylammonium hydroxide solution starting from the same initial ratio of mmol/g of clay greater than 2.40. The arrangement of C16TMA cations within the interlayer space was assumed to be perpendicular with a tilt angle of 32° to the plane of clay sheets instead of being parallel to the clay surface using C16TMAOH solution at the same ratio. Different techniques were used to characterize these materials. The thermal stability of these organ-clays was investigated using an in-situ X-ray diffraction (XRD) technique. The decomposition of the surfactant moiety occurred at temperatures higher than 215 °C and was accompanied with a shrinkage of the basal spacing value to 1.42 nm. These materials were applied in the removal of an acid dye “eosin.” The removed amount of eosin depended on the initial concentrations and the content of surfactants in the organo-clays. The removal of eosin was found to be an endothermic process. The maximum amount of 90 mg/g was achieved. The preheated treatment temperature of two selected OCs did affect the removal properties of eosin. A progressive reduction was observed at temperatures higher than 200 °C. The regeneration of spent OCs was studied and acceptable removal efficiency was maintained after 4 to 6 cycles depending on the used initial concentrations.

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“…However, the up take amount was unchanged. Similar data were obtained for another type of clay mineral with low cation exchange capacity (CEC) [ 34 ].…”

Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

Removal Properties of Anionic Dye Eosin by Cetyltrimethylammonium Organo-Clays: The Effect of Counter-Ions and Regeneration Studies

et al. 2018

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“…8). Similar results were obtained for organoclays when removing of the same dye (Al-Faze & Kooli, 2014).…”

Section: Effect Of Initial Concentrationssupporting

confidence: 79%

“…The organo-kenyaites exhibited values which were elose to or less than those of organoclay minerals. This difference was related to the contents in term of C16TMA + cations in the organo-silicates (Al-Faze & Kooli, 2014). On the other hand, the organokenyaites exhibited similar values to raw fly ash and alumina nanoparticles (Bello et al, 2013;Thabet & Ismaiel, 2016; Table 4).…”

Section: Maximum Removal Amountmentioning

confidence: 93%

Characterization of organo-kenyaites: thermal stability and their effects on eosin removal characteristics

et al. 2018

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Organo-kenyaites were prepared from a cetyltrimethylammonium hydroxide (C16TMAOH) solution and solid sodium kenyaite (Na2Si22O45.10H2O) mixture. The effect of the initial cetyltrimethylammonium solution on the structure of the intercalated materials was investigated by CHN analyses, X-ray diffraction (XRD), thermogravimetric analysis, SEM, and 29Si and 13C solid NMR techniques. For C16TMAOH concentration 0.25 mM, the Na+ cations were fully exchanged. Initial C16TMAOH concentrations higher than 0.25 mM had little effect on the intercalated amount of C16TMA+ cations. The organic cations content reached a plateau of 0.66 mmol/g. The arrangement model of C16TMA+ cations corresponded to a tilt of the organic cations to the silicate layers with an angle of 42° as deduced by XRD studies. The C16TMA+ cations exhibited mainly trans-configuration of the methyl chains, as was shown by solid 13C NMR. The thermal stability of the organo-silicates was studied using in situ FTIR and in situ XRD in the range 25–450°C. The C16TMA-kenyaites were stable at temperatures below 200°C. They collapsed at higher temperatures due to the decomposition of the intercalated surfactants. These organo-kenyaites were used to remove the acidic dye molecule, eosin. The removal tests were performed at varying conditions of initial dye concentrations, organic content in the organo-kenyaites and heating temperatures. In general, the organic modification improved the removal capacity of the Na-kenyaite from 2 mg of eosin/g to 60 mg of eosin/g, and this capacity was related to the organic contents and the calcination temperatures of the organo-kenyaites.

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“…Bentonite (BT) is a natural adsorbent material and its selectivity and capacity to adsorb pollutants can be improved significantly through modification (Rawajfih & Nsour, 2006;Alkaram et al, 2009;Jovic-Jovičićet al, 2013). Organic modification of BT increases significantly the attenuation of some organic and inorganic pollutants (Mello et al, 2009;Li et al, 2013;Wang et al, 2013Wang et al, , 2014Kooli, 2014;Simsek et al, 2014).…”

mentioning

confidence: 99%

Adsorption of Pb(II) on raw and organically modified Jordanian bentonite

et al. 2015

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A comparative study using bentonite (BT), hexadecyltrimethylammonium-modified bentonite (BT-HDTMA) and phenyl fatty hydroxamic acid-modified bentonite (BT-PFHA) as adsorbents for the removal of Pb(II) has been proposed. These adsorbents were characterized by X-ray diffraction, X-ray fluorescence, Fourier-transform infrared spectroscopy and surface area measurement. Cation exchange capacity was also determined in this study. The adsorbent capabilities for Pb(II) from aqueous solution were investigated, and the optimal experimental conditions including adsorption time, adsorbent dosage, the initial concentration of Pb(II), pH and temperature that might influence the adsorption performance were also investigated. The experimental equilibrium adsorption data were tested by four widely used two-parameter equations, the Langmuir, Freundlich, Dubinin- Radushkevich (D-R) and Temkin isotherms. The monolayer adsorption capacities of BT, BT-HDTMA and BT-PFHA for Pb(II) were 149.3, 227.3 and 256.4 mg/g, respectively. The experimental kinetic data were analysed by pseudo-first order, pseudo-second order and intraparticle diffusion kinetics models. The experimental data fitted very well with the pseudo-second order kinetic model. Determination of the thermodynamic parameters, ΔG, ΔH and ΔS showed the adsorption to be feasible, spontaneous and exothermic.

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Organo-bentonites with improved cetyltrimethylammonium contents

Cited by 6 publications

References 38 publications

Removal Properties of Anionic Dye Eosin by Cetyltrimethylammonium Organo-Clays: The Effect of Counter-Ions and Regeneration Studies

Removal Properties of Anionic Dye Eosin by Cetyltrimethylammonium Organo-Clays: The Effect of Counter-Ions and Regeneration Studies

Characterization of organo-kenyaites: thermal stability and their effects on eosin removal characteristics

Adsorption of Pb(II) on raw and organically modified Jordanian bentonite

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