Effects of surfactant adsorption on the surface functional group contents and polymerization properties of coal dust

Zhou, Qun; Qin, Botao; Zhou, Banghao; Huang, Hainan

doi:10.1016/j.psep.2023.03.049

Cited by 29 publications

(5 citation statements)

References 30 publications

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“…This mutual repulsion causes the hydrophobic tail of SDS to adsorb more readily onto the coal surface, while the hydrophilic head orients toward the water, forming an adsorption layer. This layer effectively conceals the alkane chains on the coal surface, thereby enhancing the coal’s wettability. , …”

Section: Resultsmentioning

confidence: 99%

“…As the hydrophobic tail binds with the hydrophobic carbon chains of the coal, it increases the likelihood of the hydrophilic head of the surfactant associating with water molecules. This interaction consequently enhances the hydrophilicity of the coal. , …”

Section: Resultsmentioning

confidence: 99%

“…This layer effectively conceals the alkane chains on the coal surface, thereby enhancing the coal's wettability. 40,41 The nonpolar, hydrophobic tail of the nonionic surfactant AEO-9 exhibits a strong affinity for the hydrophobic groups on the coal surface, including aromatic and aliphatic hydrocarbons. As the hydrophobic tail binds with the hydrophobic carbon chains of the coal, it increases the likelihood of the hydrophilic head of the surfactant associating with water molecules.…”

Section: Modification Mechanism Of Compound Solution Of Nanoparticle ...mentioning

confidence: 99%

“…This interaction consequently enhances the hydrophilicity of the coal. 40,42 The zwitterionic surfactant CAPB contains both positively and negatively charged hydrophilic groups. The positively charged groups engage in electrostatic interactions with the negatively charged SiO 2 nanoparticles.…”

Section: Modification Mechanism Of Compound Solution Of Nanoparticle ...mentioning

confidence: 99%

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Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Zou,

Huo,

Liu

et al. 2024

Energy Fuels

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Poor coal wettability limits the effectiveness of water injection in coal seams. Nanofluids and surfactants can improve the coal wettability. In this paper, the impact of four types of composite fluids containing surfactants and SiO 2 nanoparticles on coal wettability was investigated. By analyzing the variation in contact angle and moisture content as well as functional groups before and after modification, it is found that the compound solution can effectively enhance coal surface wettability and increase the moisture content of coal samples. Compared to deionized water and SiO 2 nanofluids, the contact angle of coal modified by the compound solution does not rebound quickly with the loss of moisture. Moreover, the average strengthening rate and water absorption mass strengthening rate were utilized to quantify the modification effects of the compound solution. It can be seen that the combination of cationic surfactant CTAB with SiO 2 nanoparticles provides the most effective modification. FTIR results imply that the modification results in increased activity of free hydroxyl groups in the coal, enhancing its hydrophilicity. The synergistical interaction of nanoparticles and surfactants can occupy vacant adsorption sites on the coal surface. Additionally, surfactants adhere to the nanoparticle surface due to van der Waals forces, while hydrophilic groups attract water molecules to the coal. The research achievements provide a theoretical foundation for the potential application of nanoparticle−surfactant compound solution in coal seam water injection.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Modification Mechanism Of Compound Solution Of Nanoparticle ...mentioning

confidence: 99%

Section: Modification Mechanism Of Compound Solution Of Nanoparticle ...mentioning

confidence: 99%

See 2 more Smart Citations

Influence of Nanoparticle–Surfactant Compound Solution on Coal Wettability

Zou,

Huo,

Liu

et al. 2024

Energy Fuels

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“…If in this case one of the components (or both) is of ionic nature, pH, type and ionic strength of the background electrolyte also must be considered. [37,38] Little is known about stability of the systems containing clay mineral, polymer and surfactant. So far, Fernandez et al have analyzed the effect of the clay surface modification and the organic clay purity on the microstructure and thermal properties (including thermal stability) of the poly(l-lactic acid)/ vermiculite (VMT) nanocomposites with the intercalated hexadecyltrimethylammonium cations and coupled with Poly(llactide) (PLLA).…”

Section: Introductionmentioning

confidence: 99%

Colloidal and Thermal Stability of Three‐Component Hybrid Materials Containing Clay Mineral, Polysaccharide and Surfactant

Godek,

Maciołek,

Kosińska‐Pezda

et al. 2023

Chemistry A European J

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The paper presents the colloidal and thermal stability of the three‐component hybrid materials containing halloysite, polysaccharides (alginic acid, cationic cellulose and hydroxyethyl cellulose) and Tritons. TX‐100, TX‐165 and TX‐405 were used as non‐ionic surfactants. Stability and other properties of the hybrid materials were tested by the following methods: UV‐Vis, TGA (thermogravimetric analysis) and DSC (differential scanning calorimetry), CHN (elemental analysis), SEM‐EDX (scanning electron microscopy with energy dispersive X‐Ray spectroscopy) and tensiometry. According to the results with the increasing polymer concentration the colloidal stability of the tested systems also increases. Moreover, the addition of the surfactants causes the increase of polysaccharide adsorption but the colloidal stability of the tested systems decreases due to large weights of formed aggregates. As follows from the thermal analysis, the comparison of the TG/DTG‐DSC curves obtained for the investigated polymers confirms that their thermal decomposition courses have some common features. The obtained results have the application potential in the formation of the materials for the pollutants removal from water and sewages.

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