Enhancement of the surface hydrophobicity of low-rank coal by adsorbing DTAB: An experimental and molecular dynamics simulation study

Xia, Yangchao; Yang, Zili; Zhang, Rui; Xing, Yaowen; Gui, Xiahui

doi:10.1016/j.fuel.2018.10.156

Cited by 142 publications

(36 citation statements)

References 55 publications

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“…Coal has been used as an active filler and blended with polymers (mainly thermoplastic) to achieve improved thermal stability and mechanical strength, thereby obtaining high‐performance polymer/coal composites . However, the coal used in previous studies for this purpose has mostly been low or medium‐rank coal with too many molecular branches, insufficiently fine particle sizes (average particle size of 5–10 μm), and poorly functionalized surfaces. The reinforcement performance of these composites has been far from acceptable for industrial application.…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Tan

Hong-zhi

Wei

et al. 2019

J of Applied Polymer Sci

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Anthracite is the highest rank of coal with a layered structure similar to that of graphite. Here, styrene-butadiene rubber/modified anthracite (MA) composites were prepared and analyzed. The microstructure and dispersion of the anthracite were improved by ball milling with the modifier bis-(γ-triethoxysilylpropyl)-tetrasulfide (KH-Si69). The particle size of the modified coal was decreased significantly tõ 3 μm, while surface interactions with the modifier yielded enhanced lamellar morphology and hydrophobic surfaces. The anthracite lamellae were well dispersed in the rubber matrix, providing good reinforcement; the tensile strength of the composite exceeded that of a composite with carbon black (CB) N660 filler (16.65 vs. 14.68 MPa). Moreover, low-level CB or silica compositing further promoted the dispersion of coal particles in the rubber, effectively enhancing the mechanical reinforcement behavior of the coal particles as well as the thermal stability of the rubber composite. Notably, it led to a 10.63% improvement in tensile strength and a 9.96 C increase in the 5% mass loss temperature compared to the composite with a single MA filler.

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Section: Introductionmentioning

confidence: 99%

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Tan

Hong-zhi

Wei

et al. 2019

J of Applied Polymer Sci

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“…Both the zeta potential and water contact angles of functionalized catalysts increase compared with Pd/SN, indicating the improvement of hydrophobicity. 44 As shown in Fig. 5, zeta potential and water contact angles do not monotonously vary with the carbon content, instead the maximum values of zeta potential and water contact angles appear at 3.28%.…”

Section: Elemental Analysis and Thermogravimetric Analysismentioning

confidence: 78%

Hydrogenation of alkyl-anthraquinone over hydrophobically functionalized Pd/SBA-15 catalysts

Wang

Zhang

et al. 2019

RSC Adv.

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“…Given that the hydrodynamics and bubble-particle diameter were kept constant in all tests, the attachment angle kinetics was only determined by the competition between bubble-particle attachment and detachment efficiency, which is more suitable to describe the floatability compared with the induction time. The Bubble-particle warp angle had been used by Xia et al [22,27] to confirm the floatability of low-ranked coal in the presence of different collectors. Raw coal clearly exhibited the fastest kinetics of the bubble-particle wrap angle compared with LH-10 and LH-20.…”

Section: Effect Of Heating Oxidation At 200 °C On the Floatability Ofmentioning

confidence: 99%

Effect of Heating Oxidation on the Surface/Interface Properties and Floatability of Anthracite Coal

Rong

Wang

et al. 2019

Processes

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Oxidation processes of coal surfaces are both fundamental and interesting from academic and engineering points of view. In this work, we comprehensively analyzed the mechanism of heating oxidation at 200 • C on the surface/interface characters and the floatability of anthracite coal. The variations of surface/interface characters were studied using SEM (scanning electron microscopy), FTIR (Fourier transform infrared spectroscopy), and XPS (X-ray photoelectron spectroscopy). The floatability was further identified using Induction Time and Bubble-Particle Wrap Angle. It was found that, after heating oxidation at 200 • C, both surface ravines and oxygen-containing groups were increased. The degradation of hydroxyl on anthracite could be neglected during the heating, while the oxidation of hydrocarbon chains dominated the balance of hydrophobicity and hydrophilicity on coal surface. The induction time significantly increased from 200 ms to 1200 ms and 2000 ms after 10 h and 20 h of heating oxidation at 200 • C, respectively. Additionally, raw coal exhibited the fastest kinetics of bubble-particle attachment and the largest wrap angle, directly proving that the floatability decreased after oxidation.

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Enhancement of the surface hydrophobicity of low-rank coal by adsorbing DTAB: An experimental and molecular dynamics simulation study

Cited by 142 publications

References 55 publications

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Thermal and mechanical enhancement of styrene–butadiene rubber by filling with modified anthracite coal

Hydrogenation of alkyl-anthraquinone over hydrophobically functionalized Pd/SBA-15 catalysts

Effect of Heating Oxidation on the Surface/Interface Properties and Floatability of Anthracite Coal

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