Insights into asphaltene aggregation in the Na-montmorillonite interlayer

Zhu, Xinzhe; Chen, Daoyi; Wu, Guozhong

doi:10.1016/j.chemosphere.2016.06.041

Cited by 16 publications

(15 citation statements)

References 44 publications

(46 reference statements)

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“…For example, the maximum adsorption capacity calculated from the Freundlich isotherm was 37% less on the wetted than on the dry K10 MMT, while about a 13% decrease in the adsorption capacity after hydration was also observed from the Langmuir and Dubinin–Radushkevich fitting (Table ). According to our previous molecular simulation results, such an observation was attributed to the water film spontaneously assembled on the MMT surface which expelled the ASP from the solid surface due to the decreased adsorption site . Nevertheless, the hydration process did not change the adsorption rate according to the Langmuir isotherm with R 2 = 0.9939 (Table ).…”

Section: Resultsmentioning

confidence: 71%

“…According to our previous molecular simulation results, such an observation was attributed to the water film spontaneously assembled on the MMT surface which expelled the ASP from the solid surface due to the decreased adsorption site. 9 Nevertheless, the hydration process did not change the adsorption rate according to the Langmuir isotherm with R 2 = 0.9939 (Table 2).…”

Section: ■ Results and Discussionmentioning

confidence: 92%

“…They might also alter the mineral surface from hydrophilic to hydrophobic by surface adsorption, and change the oil wetting mode on the mineral surface by influencing the spreading and penetration processes of the resins and aromatics . Our recent simulation works further demonstrated that the asphaltenes would coaggregate with the humic substances at the oil–water interface and in bulk water. − As is known, humic substances such as humic acid, fulvic acid, and humin are naturally occurring compounds, which constitute 50–80% of the natural organic matters (NOM) in the water, soil, and sediments . As one main fraction of humic substances, humic acids are soluble in alkaline media, partially soluble in water, and insoluble in acidic media.…”

Section: Introductionmentioning

confidence: 87%

“…Our simulation works also indicated that the humic acids would form a hollow cone-shaped cavity with a hydrophobic interior (aromatic rings) to entrap the asphaltenes, which decreased the diffusion of asphaltenes by up to one-order of magnitude and modified the asphaltene surface from hydrophobic to hydrophilic. 9 Although experimental works on the adsorption of asphaltenes on sand and clay have been previously reported, 19−21 it remains unclear how the interactions between humic acids and asphaltenes would influence surface adsorption kinetics of the asphaltenes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Sun

Chen

2019

Langmuir

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Humic substances in the soil and underground water are important media for the environmental fate and transport of oil pollutants, but direct experimental evidence is lacking on the effects of humic acids on the interfacial activity and adsorption properties of oil asphaltenes in the soil. In this study, the oil−water interfacial tension (IFT) was measured by optical contact angle instruments, while the isothermal adsorption of asphaltenes on two montmorillonites and one kaolinite was fitted using four classical models. Results demonstrated that the oil−water IFT decreased by 37.5% when the asphaltenes (500 mg L −1 ) were present in the oil, which further decreased by 62.7% when the humic acids (25 mg L −1 ) were added in the water. The best-fitted form of isotherm equation (Langmuir model) and the adsorption capacity were not changed by coating humic acids on the clay surface prior to asphaltene adsorption, but the presence of humic acids on the clay surface doubled the adsorption rate. Results also revealed that the asphaltenes could coaggregate with the humic acids at the oil−water interface or in the bulk water, but they were unlikely to coaggregate with the humic acids binding on the clay surface.

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Section: Resultsmentioning

confidence: 71%

Section: ■ Results and Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 87%

Section: ■ Introductionmentioning

confidence: 99%

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Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Sun

Chen

2019

Langmuir

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“…The crystallographic character specifically interlayer or basal spacing [24,25] of the pristine Na-MMT powder and the nanocomposite samples, was determined by using an X-ray diffractometer (XRD), Bruker (model D8 Advance) with monochromatized CuKα radiation (λ=0.154 nm). The samples were then scanned at a rate of 1°/min, and the range of 2θ was from 2° to 12° in 0.02° steps at room temperature.…”

Section: Characterisationmentioning

confidence: 99%

Mechanical and Thermal Properties of Nylon-6/LNR/MMT Nanocomposites Prepared Through Emulsion Dispersion Technique

Shamsuri

Daik

2020

ARFMTS

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In this research, nylon-6/liquid natural rubber/montmorillonite (nylon-6/LNR/MMT) nanocomposites were prepared through emulsion dispersion technique with contents of MMT from 2 to 10 wt.%. The mechanical, crystallographical, morphological, and thermal properties of the prepared nanocomposites were then characterised by using mechanical testers, XRD, TEM, DSC, and TGA. The mechanical test results showed that the tensile stress, tensile modulus, and impact strength of the nanocomposites improved with the incorporation of MMT. The XRD results displayed that there are no isotropic peaks were observed in the nanocomposites with 2, 4, and 6 wt.% of MMT. The TEM micrographs exhibited that the exfoliated state was achieved in the nanocomposites with less than 8 wt.% of MMT. The DSC and TGA results also indicated that the incorporation of MMT had increased the glass transition temperatures and degradation temperatures of the nanocomposites. In conclusion, the emulsion dispersion technique could prepare the nylon-6/LNR/MMT nanocomposites with improved mechanical and thermal properties.

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Investigation of gas hydrate formation and inhibition in oil-water system containing model asphaltene

Wang

et al. 2021

Chemical Engineering Journal

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Insights into asphaltene aggregation in the Na-montmorillonite interlayer

Cited by 16 publications

References 44 publications

Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Adsorption of Asphaltenes at Oil–Water and Oil–Clay Interfaces in the Presence of Humic Acids

Mechanical and Thermal Properties of Nylon-6/LNR/MMT Nanocomposites Prepared Through Emulsion Dispersion Technique

Investigation of gas hydrate formation and inhibition in oil-water system containing model asphaltene

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