Computer analysis of the microporous structure of activated carbon fibres using the fast multivariant identification procedure of adsorption system parameters

Kwiatkowski, Mirosław

doi:10.1016/j.jcis.2008.11.001

Cited by 12 publications

(10 citation statements)

References 98 publications

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“…In concept, coupling nanoporosity in the ultra‐fine nanofibers should lead to the highest possible specific surface and fibrous materials. Hence, the synthesis of organic polymer or inorganic nanofibers with nanoporous structures might be very useful in a widely areas, such as membranes technology,12 tissue engineering,13 drug delivery,14 adsorption materials,15, 16 filtration and separation,17 catalyst supports,18, 19 gas storage,20 sensors,21–23 and electrode materials24–26 and so forth.…”

Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile and Carbon Nanofibers with Controllable Nanoporous Structures by Electrospinning

Zhang

Wang

et al. 2009

Macro Materials & Eng

121

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In this work, polyacrylonitrile (PAN) and carbon nanofibers with controllable nanoporous structures were successfully prepared via electrospinning technique. For the preparation of porous PAN nanofibers, two kinds of polymers of PAN and polyvinylpyrrolidone (PVP) were used as electrospun precursor materials, and then the bicomponent nanofibers of PAN and PVP were extracted with water to remove the PVP in the composite polymer nanofibers. By altering the ratio of PAN/PVP in the precursor, the pore size and pore distribution of porous PAN nanofibers could be easily controlled. By using the porous PAN nanofibers as structures directing template and through heat treatment, carbon nanofibers with nanoporous structures were obtained. The porous nanofibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT‐IR), differential thermal analyses (DTA), Brunauer–Emmett–Teller (BET) nitrogen adsorption, X‐ray diffraction (XRD), and Raman spectra.magnified image

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Section: Introductionmentioning

confidence: 99%

Polyacrylonitrile and Carbon Nanofibers with Controllable Nanoporous Structures by Electrospinning

Zhang

Wang

et al. 2009

Macro Materials & Eng

121

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“…Each cluster starts at a place (primary site) on a pore wall producing a local minimum of adhesion energy. Further molecules (the layers n > 1) are joined due to cohesive and adhesive forces [15][16][17][18][19][20][21][22][23][24]. The maximum number of layers k (referred to as the cluster size) is determined by a space preassigned to another cluster (competitive clusterization -1st type) or by a geometry of pore (2 nd type).…”

Section: The Adsorption Lbet Class Modelsmentioning

confidence: 99%

“…The second model type describes the systems in which limitations of cluster size result from pores size. Upon derivation of the LBET class models the following assumptions were taken into account [15][16][17][18][19][20][21][22][23][24]: a) the layers n > 1 are homogeneous and energetic parameters B C are the same for n > 1:…”

Section: The Adsorption Lbet Class Modelsmentioning

confidence: 99%

“…The number of primary adsorption sites is expressed by the formula given below [15][16][17][18][19][20][21][22][23][24]: where  is the geometrical parameter of the porous structure,   0, 1), m hAk is the amount of primary sites for the k th type clusters c) the first layer physical adsorption energy is expressed in the following form:…”

Section: The Adsorption Lbet Class Modelsmentioning

confidence: 99%

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Numerical analysis of the effect of the kind of activating agent and the impregnation ratio on the parameters of the microporous structure of the active carbons

Kwiatkowski

2015

J. Phys.: Conf. Ser.

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The paper presents the results of the research on the application of the LBET class adsorption models with the fast multivariant identification procedure as a tool for analysing the microporous structure of the active carbons obtained by chemical activation using potassium and sodium hydroxides as an activator. The proposed technique of the fast multivariant fitting of the LBET class models to the empirical adsorption data was employed particularly to evaluate the impact of the used activator and the impregnation ratio on the obtained microporous structure of the carbonaceous adsorbents.

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“…Among them, activated carbon fiber (ACF) is attracting more and more attention as a novel porous carbonaceous material with excellent properties. Compared with commercial activated carbon (AC), ACF has the advantages of larger adsorption capacity, faster intramolecular adsorption kinetics and flexible engineering application [4][5][6], which make it widely used in the fields of hydrogen storage [7], air purification [8] and waste water treatment [9], and so on. However, higher production cost than AC limits the application of ACF.…”

Section: Introductionmentioning

confidence: 99%

Effects of oxygen content of pitch precursors on the porous texture and surface chemistry of pitch-based activated carbon fibers

Wang

Yang

et al. 2019

SN Appl. Sci.

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Oxidized pitches with different oxygen content were prepared using ethylene tar as a raw material by air-blowing method, then the resultant pitch-based activated carbon fibers (ACFs) were prepared through spinning, stabilization, carbonization, and CO 2 activation processes. The results showed that the oxygen content of prepared oxidized pitch was up to 4.44% when the basic pitch was air-blown at 250 °C, and the BET surface area of the corresponding ACF was up to 1047 m 2 /g with 0.536 mmol/g carboxylic group, 0.043 mmol/g lactonic group and 0.193 mmol/g phenolic hydroxyl group on the surface after 900 °C CO 2 activation. It revealed that the spinnability of oxidized pitch became poor as increasing its oxygen content, while the obtained carbon fiber was easy to be activated and the prepared ACF was equipped with large specific surface area and rich surface functional groups. However, the pore structure was easy to collapse and the surface area was seriously decreased when the oxygen content of pitch precursor was too high. Therefore, the property regulation of pitch precursor could effectively improve the porous texture and surface chemistry of the resultant ACF.

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Computer analysis of the microporous structure of activated carbon fibres using the fast multivariant identification procedure of adsorption system parameters

Cited by 12 publications

References 98 publications

Polyacrylonitrile and Carbon Nanofibers with Controllable Nanoporous Structures by Electrospinning

Polyacrylonitrile and Carbon Nanofibers with Controllable Nanoporous Structures by Electrospinning

Numerical analysis of the effect of the kind of activating agent and the impregnation ratio on the parameters of the microporous structure of the active carbons

Effects of oxygen content of pitch precursors on the porous texture and surface chemistry of pitch-based activated carbon fibers

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