Structure evolution characterization of Anyang anthracites via H2O2 oxidization and HF acidification

Zhang, Yude; Tan, Jinlong; Kang, Xiaojuan; Yu, Hongsong; Frost, Ray L.

doi:10.1016/j.saa.2014.04.046

Cited by 18 publications

(9 citation statements)

References 40 publications

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“…The FTIR spectra of raw and MA are shown in Figure . We observe stretching vibrations and in‐plane vibrations of the hydroxyl bonds (OH) at the spectral peaks at 3100–3600 and 1400 cm −1 , respectively . After modification of the coal, the strength of these peaks is decreased, which corresponds to a decrease in the hydroxyl content on the coal surface; silanol formed by the hydrolysis of the silane coupling agent can react with and consume hydroxyl groups or cover their signals.…”

Section: Resultsmentioning

confidence: 96%

“…Anthracite has aromatic rings as the basic structural unit; these are usually linked by aliphatic or heteroaliphatic bridges; it also has some oxygen‐containing functional groups, such as carboxyl (COOH), hydroxyl (OH), and ester (COOR) groups, with small amounts of thiol–mercaptan (RSH), sulfoether, disulfide, and heterocyclic sulfur groups . The side‐chain structures and active oxygen‐containing functional groups endow anthracite particles with good chemical reactivity . Considering the preparation of coal‐based functional fillers, anthracite has potential advantages, including its high carbon content, moderate oxygen functional groups, and aromatic lamellar structure similar to that of graphite .…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 96%

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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“…Compared to those of FC0, the contents of the C═C and C═O functional groups decrease from 64.04 and 11.37% in FC0 to 62.40 and 7.18% in FC5 after the addition of silica sol, respectively while that of the CO and CC groups increase from 10.78 and 13.80% in FC0 to 13.83 and 16.59% in FC5, respectively. The reason may be that the particle fragmentation of humic acid under the mechanochemical forces (ball milling) leads to partial C═C double bond breakage and thus to the formation of new active sites that can be bound to hydroxyl groups (mainly contributed by silica hydroxyl groups or water) 47,48 . The reduction of C═O is mainly caused by the volatilization of small molecule side chains in humic acid during carbonation by cleavage 49 .…”

Section: Resultsmentioning

confidence: 99%

Preparation of an eco‐friendly carbon–silicon dual‐phase rubber filler with humic acid and silica sol

Tan

Xue

Sun

2021

J of Applied Polymer Sci

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A new type of carbon–silicon dual‐phase filler (CSDPF) was prepared from highly active and widely available humic acid and low‐cost silica sol as raw materials, which were further used for styrene butadiene rubber (SBR) by ball milling and carbonization methods. The effects of the silica sol content and the bis(3‐triethoxysilylpropyl) tetrasulfide (TESPT) on the structure and surface properties of the CSDPF were investigated systematically. Silica sol combined with humic acid in the carbon–silicon dual‐phase complexes in the form of SiOC, while the TESPT and carbon–silicon dual‐phase complexes were combined in the form of SiOSi in the CSDPF. As the content of silica sol increased in the dual‐phase complexes, the amount and particle size of silica on the surface of CSDPF increased. A certain amount of silica in the fabricated filler facilitated its subsequent modification and applications. Compared with CB/SBR (SBR filled with carbon black 660), the mechanical properties, thermal stability, wear resistance, and wet skid resistance of SBR filled with the CSDPF were significantly improved. This work provides a new strategy for developing CSDPF.

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“…Sulfates are barite, gypsum, and anhydrite, 4,5 while organic sulfur exists in the form of thiophene heterocyclic compounds, mercaptan, thioether, and so forth. It is mainly embedded in the macromolecular structure of coals, which is more difficult to be removed by using the conventional physical desulfurization method 6 . Although the chemical method can effectively remove organic sulfur, it requires high temperature and pressure associated with expensive operating costs 7–9 .…”

Section: Introductionmentioning

confidence: 99%

An effective method to remove organic sulfur in coal: Effects on the physicochemical properties and combustion kinetics

Liu

et al. 2021

Environ Prog Sustainable Energy

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The present work investigated an effective method to remove organic sulfur in coal utilizing different microorganisms (Nocardia mangyaensis and Pseudomonas putida).The most obvious finding to emerge from the sulfur forms analysis is that the organic sulfur removal of these two bacterial strains on Yunnan bumuga high-sulfur coal were 61.58% and 54.19%, respectively. This result may be confirmed by the Fourier transform infrared spectroscopy (FTIR) analyses that there were obvious decreases of intensity after biotreatment in the C S bond. Besides, the results of X-ray diffraction and X-ray photoelectron spectroscopy showed that major mineralogical phases in the forms of kaolinite and pyrite exist in raw coal. And more than 80% of thiophene and sulfoxide in the raw coal were removed by N. mangyaensis and P. putida. In addition, the results of the thermogravimetric analysis indicated that the combustion performance of biotreated coal samples was better than that of raw coal, and the most probable models to describe the combustion kinetics for biotreated coal and raw coal at different stages were obtained by the Arrhenius method and Coats-Redfern method.

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Structure evolution characterization of Anyang anthracites via H2O2 oxidization and HF acidification

Cited by 18 publications

References 40 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

Preparation of an eco‐friendly carbon–silicon dual‐phase rubber filler with humic acid and silica sol

An effective method to remove organic sulfur in coal: Effects on the physicochemical properties and combustion kinetics

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