Change of organobentonite interlayer microstructure induced by sorption of aromatic and petroleum hydrocarbons—A combined study of laboratory characterization and molecular dynamics simulations

Ghavami, Mohammad; Zhao, Qian; Javadi, Sadra; Jangam, John Samuel Dilip; Jasiński, Jacek B.; Saraei, Nina

doi:10.1016/j.colsurfa.2017.01.038

Cited by 19 publications

(13 citation statements)

References 47 publications

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“…However, the present study indicates that the d 001 basal spacing of the organoclays increases significantly after sorption of BPA, and shows that BPA molecules enter the interlayers of the investigated organoclays. This increase in the d 001 basal spacing is similar to the results obtained by Ghavami et al on naphthalene and petroleum hydrocarbons sorption on C 16 -montmorillonite and organo-bentonites [ 20 ] and 2-chloroaniline sorption on dimethyl ditallowylammonium modified clays [ 21 ]. The insertion of the BPA molecules into the organoclays interlayers causes a rearrangement of the intercalated surfactants which raise in the same way as found at increased surfactant loading [ 25 ].…”

Section: Resultssupporting

confidence: 88%

“…The surfactant molecule orientation in the interlayer is strongly dependent on the degree of loading with the alkyl chains oriented parallel with the sheets at low loading, but the long alkyl chains are rising with increasing loading to be standing almost perpendicular to the sheets at high loading levels [ 25 , 32 ]. Ghavami et al reported an increase of 2 Å in the d 001 basal spacing of C 16 -montmorillonite after naphthalene sorption and this indicated that naphthalene molecules penetrated and remained in the C 16 -montmorillonite interlayers [ 20 ]. This result supports the fact that naphthalene sorption occurs mostly in the organoclays interlayer and the authors assumed that the sorption is driven by the short-range forces between sorbates and surfactant sorbents [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…The decrease of the d 001 basal spacing after chlorophenol sorption was attributed to the formation of tightly packed aggregates with van der Waals and electrostatic forces [ 19 ]. Ghavami et al [ 20 ] reported an interlayer expansion of C 16 -montmorillonite after naphthalene sorption, which indicated that naphthalene molecules penetrated and remained in the C 16 -montmorillonite interlayers [ 20 ]. Similarly, they found that the d 001 basal spacing of organo-bentonites increased upon the sorption of C 6 and C 8 alkanes and that the sorbate molecules penetrated the interlayer [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

“…Ghavami et al [ 20 ] reported an interlayer expansion of C 16 -montmorillonite after naphthalene sorption, which indicated that naphthalene molecules penetrated and remained in the C 16 -montmorillonite interlayers [ 20 ]. Similarly, they found that the d 001 basal spacing of organo-bentonites increased upon the sorption of C 6 and C 8 alkanes and that the sorbate molecules penetrated the interlayer [ 20 ]. A similar observation was made for the 2-chloroaniline sorption into organically modified clays [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Sorption of Bisphenol A as Model for Sorption Ability of Organoclays

2022

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The arrangement of bisphenol A molecules into organoclays and their interactions with the intercalated surfactant were studied. The organoclays were prepared via solid-state intercalation of four cationic surfactants, such as dodecyltrimethyl-, tetradecyltrimethyl-, hexadecyltrimethyl-, and didodecyldimethyl-ammonium, as bromide salts, at different loading levels into the interlayers of two natural clays. The natural clays, the prepared organoclays, and the spent organoclays were characterized by X-ray powder diffraction, infrared spectroscopy, and scanning electron microscopy. X-ray powder diffraction measurements showed successive interlayer expansions of the d001 basal spacing due to the intercalation of the cationic surfactants and the bisphenol A sorption. The increased d001 basal spacing of the organoclays after bisphenol A sorption indicates that the molecules are integrated between the alkyl chains of the surfactant in the organoclays interlayers. Infrared spectroscopy was employed to probe the intercalation of the cationic surfactants and the sorbed bisphenol A. New characteristic bands attributed to the bisphenol A phenol rings appear in the range 1518–1613 cm−1 on the infrared spectra of the spent organoclays, proving the presence of bisphenol A in the hydrophobic interlayers. Scanning electron microscopy of the organoclays before and after BPA sorption shows that their morphology becomes fluffy and that the presence of the organic molecules expands the clay structure.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sorption of Bisphenol A as Model for Sorption Ability of Organoclays

2022

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“…However, using long alkyl ammonium cations, the modified cetyltrimethylammonium-magadiite was used as an intermediate precursor to synthesize mesoporous materials with a controlled distribution of pores sizes [ 17 , 18 ]. In the removal of dyes process, it was underlined that the removal efficiency of organo-clay minerals was affected by the surfactant alkyl chain length [ 19 , 20 , 21 , 22 ]. A clay mineral modified with a long-chain surfactant exhibited a higher removal capacity than did short-chain surfactant.…”

Section: Introductionmentioning

confidence: 99%

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

et al. 2018

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Na-magadiite exchanged with cetyl-trimethylammonium cations provided organophilic silicate materials that allowed for the effective removal of the acidic dye “eosin”. The organic cations were intercalated into the interlayer spacing of the layered silicate via an exchange reaction between the organic cations from their bromide salt and the solid Na-magadiite at room temperature. Different techniques were used to characterize the effect of the initial concentration of the surfactant on the structure of the organo-magadiites. The C, H, and N analysis indicated that a maximum of organic cations of 0.97 mmol/g was achieved and was accompanied by an expansion of the basal spacing of 3.08 nm, with a tilted angle of 59° to the silicate layers. The conformation of the organic surfactants was probed using solid-state 13C, finding mainly the trans conformation similar to that of the starting cetyl trimethylammonium bromide salt (C16TMABr). Thermal gravimetric analysis was carried out to study the thermal stability of the resulting organo-magadiites. The intercalated surfactants started to decompose at 200 °C, with a mass loss percentage of 8% to 25%, depending on the initial loading of the surfactant, and was accompanied by a decrease of the basal spacing from 3.16 nm to 2.51 nm, as deduced from the in situ X-ray diffraction studies. At temperatures below 220 °C, an expansion of the basal spacing from 3.15 to 3.34 nm occurred. These materials were used as a removal agent for the anionic dye eosin. The maximum amount of the dye removed was related to the organic cation content and to the initial concentration of eosin, with an improvement from 2.5 mg/g to 80.65 mg/g. This value decreased when the organo-magadiite was preheated at temperatures above 200 °C. The regeneration tests indicated that an 85% removal efficiency was maintained after six cycles of use for the organo-magadiite using Ci of 200 mg/L.

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Adsorption characteristics of hexadecyl ammonium with different numbers of carbon chains in montmorillonite and the structure of the prepared composites

Qiu

Jiang

et al. 2021

J Porous Mater

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Change of organobentonite interlayer microstructure induced by sorption of aromatic and petroleum hydrocarbons—A combined study of laboratory characterization and molecular dynamics simulations

Cited by 19 publications

References 47 publications

Sorption of Bisphenol A as Model for Sorption Ability of Organoclays

Sorption of Bisphenol A as Model for Sorption Ability of Organoclays

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Adsorption characteristics of hexadecyl ammonium with different numbers of carbon chains in montmorillonite and the structure of the prepared composites

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