Carbon Dioxide Adsorption on Carbon Nanofibers with Different Porous Structures

Abstract

Electrospinning techniques have become an efficient way to produce continuous and porous carbon nanofibers. In view of CO2 capture as one of the important works for alleviating global warming, this study intended to synthesize polyacrylonitrile (PAN)-based activated carbon nanofibers (ACNFs) using electrospinning processes for CO2 capture. Different structures of PAN-based ACNFs were prepared, including solid, hollow, and porous nanofibers, where poly(methyl methacrylate) (PMMA) was selected as the sacrificing core or pore generator. The results showed that the PMMA could be removed successfully at a carbonization temperature of 900 °C, forming the hollow or porous ACNFs. The diameters of the ACNFs ranged from 500 to 900 nm, and the shell thickness of the hollow ACNFs was approximately 70–110 nm. The solid ACNFs and hollow ACNFs were microporous materials, while the porous ACNFs were characterized by hierarchical pore structures. The hollow ACNFs and porous ACNFs possessed higher specific surface areas than that of the solid ACNFs, while the solid ACNFs exhibited the highest microporosity (94%). The CO2 adsorption capacity on the ACNFs was highly dependent on the ratio of V<0.7 nm to Vt, the ratio of Vmi to Vt, and the N-containing functional groups. The CO2 adsorption breakthrough curves could be curve-fitted well with the Yoon and Nelson model. Furthermore, the 10 cyclic tests demonstrated that the ACNFs are promising adsorbents.

Enhanced CO2 Adsorption and Selectivity of CO2/N2 on Amine@ZIF-8 Materials

“…Different types of adsorbents have been investigated and developed for CO 2 adsorption, for example, carbon-based materials, zeolites, metal oxides, and mesoporous silica [7,[11][12][13][14][15][16][17][18]. Nevertheless, these conventional porous materials usually display limited performance toward CO 2 adsorption capacity as well as selectivity.…”

Post-treatment strategies for pyrophoric KOH-activated carbon nanofibres

“…47 Comparable CO 2 adsorption capacities were reported by Chiang et al and Zainab et al who obtained 3.5 mmol g −1 at 298 K, which is close to the obtained 4.2 mmol g −1 at 293 K on the high O 2 -ow sample in this study (S6). † 55,56 The pore size distribution was determined using Monte-Carlo calculations and the cumulative pore volume is shown in Fig. 8b.…”

Hydrogen Production, Purification, Storage, Transportation, and Their Applications: A Review

“…Similar way, CO 2 adsorption by activated carbon nanofibers prepared from PAN, PVDF, and melamine was reported by a number of authors with adsorption in the range 0.55-3.47 mmol g À1 at 25 °C. Shi et al [95][96][97][98][99][100] studied acetone and CO 2 adsorption properties of porous carbon nanofibers prepared from PAN and reported acetone adsorption capacity of 955.74 mg g À1 and CO 2 adsorption of 3.34 mmol g À1 at 25 °C. Storage of hydrogen gas by electrospun nanofibers, being the main focus of this paper, is presented below in separate sections.…”