Graphene-based semi-coke porous carbon with N-rich hierarchical sandwich-like structure for efficient separation of CO2/N2

Ning, Hailong; Yang, Zhiyuan; Wang, Dechao; Meng, Zhuoyue; Li, Yinyan; Ju, Xiaoqian; Wang, Changguo

doi:10.1016/j.micromeso.2020.110700

Cited by 35 publications

(23 citation statements)

References 56 publications

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“…With increasing solvent polarity, the fluorescence maxima peak in emission spectra shows a bathochromic shift accompanied by a decrease of fluorescence intensity, which clearly indicates the existence of ICT process. 19,20 Additionally, the absorption of O-IDTBR and EH-IDTBR films exhibit a shoulder peak compared with IDFBR, which is attributed to the aggregation of indacenodithiopheneco-benzothiadiazole (IDT-BT). 21 The maximum emission peaks of IDFBR, O-IDTBR and EH-IDTBR are at 622 nm, 784 nm and 766 nm at solid film state and maximum absorption wavelength is set to excitation wavelength.…”

Section: Uv-vis Absorption and Fluorescence Spectroscopymentioning

confidence: 99%

Highly broadband NLO response of acceptor–donor–acceptor materials with a planar conformation

Huang

Zhou

et al. 2021

Mater. Adv.

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Section: Uv-vis Absorption and Fluorescence Spectroscopymentioning

confidence: 99%

Highly broadband NLO response of acceptor–donor–acceptor materials with a planar conformation

Huang

Zhou

et al. 2021

Mater. Adv.

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“…The excess of CO 2 emission has significantly affected the global warming, sea level rise, and climate changes. Therefore, the conversion, capture, and separation of CO 2 are crucial to tackle the abovementioned environmental problems attracting a plenty of attention in science and engineering in 21st century [ 2 , 3 , 4 ]. Several conventional techniques like amine adsorption, Pressure Swing Adsorption (PSA), and cryogenic distillation are used for CO 2 separation [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Polydimethysiloxane (PDMS) Dense Layer on Polyetherimide (PEI) Hollow Fiber Support for the Efficient CO2/N2 Separation Membranes

Knozowska

Kujawa

et al. 2021

Polymers

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The development of thin layer on hollow-fiber substrate has drawn great attention in the gas-separation process. In this work, polydimethysiloxane (PDMS)/polyetherimide (PEI) hollow-fiber membranes were prepared by using the dip-coating method. The prepared membranes were characterized by Scanning Electron Microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and gas permeance measurements. The concentration of PDMS solution and coating time revealed an important influence on the gas permeance and the thickness of the PDMS layer. It was confirmed from the SEM and EDX results that the PDMS layer’s thickness and the atomic content of silicon in the selective layer increased with the growth in coating time and the concentration of PDMS solution. The composite hollow-fiber membrane prepared from 15 wt% PDMS solution at 10 min coating time showed the best gas-separation performance with CO2 permeance of 51 GPU and CO2/N2 ideal selectivity of 21.

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“…To explore the methane adsorption mechanism in the micropores, the structure of micropores with the density map after methane adsorption were combined; in this way, the adsorption state of methane in the macromolecular structure could be observed more clearly ( Figure 15 ). Three slices were cut at equal distances on the three axes of X Y Z , and from these slices, it was found that methane adsorption in micropores showed pore volume filling mechanism; 42 , 43 all of the methane was adsorbed inside the pores. When the diameter of the pore was 8.2 Å, the methane in the pore began to scatter.…”

Section: Resultsmentioning

confidence: 99%

Construction of Buertai Coal Macromolecular Model and GCMC Simulation of Methane Adsorption in Micropores

et al. 2021

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With the increase in high gas mines in the low coal rank mining area in the northwestern part of China, high gas mines in the low-rank coal mining area have caused many gas emission accidents. Coal is a porous material, containing a large number of micropores (<2 nm), which can absorb large amounts of methane, so it is necessary to explore methane adsorption in micropores of low-rank coal. In this work, FTIR, HRTEM, and 13 C-NMR were used to test the macromolecular structural parameters of Buertai coal, which was a kind of low-rank Jurassic coal in northwestern China. The results showed that the aromatic structural units in the Buertai coal structure mainly consist of naphthalene, anthracene, and phenanthrene. The fat structure mainly occurs in the form of aliphatic side chains, cycloalkanes, and other compounds. The oxygen atoms are present in the form of carbonyl groups, ether bonds, and phenol groups with a ratio of about 6:4:9. The nitrogen atoms are present in the form of pyrrole and pyridine compounds. Finally, the macromolecular structure model of Buertai coal was built, and the calculated NMR spectrum from the model was very consistent with the experimental NMR spectrum of Buertai coal. The relationship between the macromolecular density and energy of Buertai coal was explored using the Amorphous Cell module in the simulation software, Materials Studios 8.0 (MS 8.0), and the density value at the lowest energy was determined to be about 1.23 g/cm 3 . The pore structure parameters of Buertai coal were also calculated. It was found that both pore volume and void fraction decreased evenly as the diameter of the probe molecule increased, but the surface area decreased rapidly when the diameter of the probe molecule was 3.46 Å. All pore sizes were found to be smaller than 10 Å from the pore size distribution (PSD) curve of Buertai coal, which provided a lot of adsorption sites for methane (CH 4 ). The results of the CH 4 adsorption simulation from Grand Canonical Monte Carlo (GCMC) showed that CH 4 is adsorbed inside the micropores of coal, and the adsorption capacity of CH 4 depends on the diameters of micropores when the micropores are less than 8.5 Å. There are many micropores where CH 4 did not appear because these micropores are closed and did not provide a channel for CH 4 to enter. The results of experimental methane adsorption indicate that the excess adsorption capacity from the GCMC simulation was very close to the experimental results of Buertai coal. This work provides a new perspective to study the methane adsorption behavior in micropores of coal.

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Graphene-based semi-coke porous carbon with N-rich hierarchical sandwich-like structure for efficient separation of CO2/N2

Cited by 35 publications

References 56 publications

Highly broadband NLO response of acceptor–donor–acceptor materials with a planar conformation

Highly broadband NLO response of acceptor–donor–acceptor materials with a planar conformation

Fabrication of Polydimethysiloxane (PDMS) Dense Layer on Polyetherimide (PEI) Hollow Fiber Support for the Efficient CO2/N2 Separation Membranes

Construction of Buertai Coal Macromolecular Model and GCMC Simulation of Methane Adsorption in Micropores

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