scholarly journals Effect of Thermal Stabilization on PAN-Derived Electrospun Carbon Nanofibers for CO2 Capture

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4197
Author(s):  
Elisa Maruccia ◽  
Stefania Ferrari ◽  
Mattia Bartoli ◽  
Lorenzo Lucherini ◽  
Giuseppina Meligrana ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Co2 Capture ◽  
Carbon Capture ◽  
Thermal Stabilization ◽  
Co2 Uptake ◽  
Stabilization Temperature ◽  
Co2 Adsorption Capacity ◽  
Nitrogen Doped Carbon ◽  
Poly Acrylonitrile ◽  
Pan Fibers

Carbon capture is amongst the key emerging technologies for the mitigation of greenhouse gases (GHG) pollution. Several materials as adsorbents for CO2 and other gases are being developed, which often involve using complex and expensive fabrication techniques. In this work, we suggest a sound, easy and cheap route for the production of nitrogen-doped carbon materials for CO2 capture by pyrolysis of electrospun poly(acrylonitrile) (PAN) fibers. PAN fibers are generally processed following specific heat treatments involving up to three steps (to get complete graphitization), one of these being stabilization, during which PAN fibers are oxidized and stretched in the 200–300 °C temperature range. The effect of stabilization temperature on the chemical structure of the carbon nanofibers is investigated herein to ascertain the possible implication of incomplete conversion/condensation of nitrile groups to form pyridine moieties on the CO2 adsorption capacity. The materials were tested in the pure CO2 atmosphere at 20 °C achieving 18.3% of maximum weight increase (equivalent to an uptake of 4.16 mmol g−1), proving the effectiveness of a high stabilization temperature as route for the improvement of CO2 uptake.

scholarly journals Carbon Dioxide Adsorption on Carbon Nanofibers with Different Porous Structures

2021 ◽  
Vol 11 (16) ◽  
pp. 7724 ◽  
Author(s):  
Yu-Chun Chiang ◽  
Chih-Cheng Huang ◽  
Wei-Ting Chin
Keyword(s):  
Carbon Nanofibers ◽  
Co2 Capture ◽  
Co2 Adsorption ◽  
Breakthrough Curves ◽  
Porous Structures ◽  
Carbon Dioxide Adsorption ◽  
Cyclic Tests ◽  
Surface Areas ◽  
Co2 Adsorption Capacity ◽  
Hierarchical Pore

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.

scholarly journals Influence of boric acid on radial structure of oxidized polyacrylonitrile fibers

e-Polymers ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 79-86
Author(s):  
Xue-Fei Wang ◽  
Xiao-Long Zhu ◽  
Chi Jiang ◽  
Jian-Min Guan ◽  
Xin Qian ◽  
...  
Keyword(s):  
Boric Acid ◽  
Carbon Fibers ◽  
High Performance ◽  
Boron Content ◽  
Fiber Surface ◽  
Thermal Stabilization ◽  
Stabilization Time ◽  
Radial Structure ◽  
Stabilization Temperature ◽  
Pan Fibers

AbstractThe surface modification of polyacrylonitrile (PAN) fibers with boric acid was utilized to modulate the homogeneity of the radial structure of the PAN fibers during thermal stabilization. Exothermic peaks of the fibers were put off by boric acid, and unreacted nitrile groups of the oxidized PAN fibers increased with the boron content, indicating that boric acid on the fiber surface had an retardant effect on the thermal stabilization of PAN fibers. The relative skin thicknesses of the oxidized PAN fibers were quantitatively measured by sulfuric acid etching and SEM observation. The value increased obviously with the boron content, which could be further elevated by increasing stabilization time or decreasing stabilization temperature. Oxidized PAN fibers with more homogeneous radial structure can thus be obtained with the modification of boric acid, which might be beneficial for the preparation of high performance carbon fibers.

Ideal–Gas Thermochemical Properties for Alkanolamine and Related Species Involved in Carbon Capture Applications

2020 ◽  
Author(s):  
Nayyereh hatefi ◽  
William Smith
Keyword(s):  
Heat Capacity ◽  
Electronic Structure ◽  
Co2 Capture ◽  
Carbon Capture ◽  
Ideal Gas ◽  
Thermochemical Properties ◽  
Temperature Range ◽  
Comparison Results ◽  
Electronic Structure Methods ◽  
Protonated Forms

<div>Ideal{gas thermochemical properties (enthalpy, entropy, Gibbs energy, and heat capacity, Cp) of 49 alkanolamines potentially suitable for CO2 capture applications and their carbamate and protonated forms were calculated using two high{order electronic structure methods, G4 and G3B3 (or G3//B3LYP). We also calculate for comparison results from the commonly used B3LYP/aug-cc-pVTZ method. This data is useful for the construction of molecular{based thermodynamic models of CO2 capture processes involving these species. The Cp data for each species over the temperature range 200 K{1500 K is presented as functions of temperature in the form of NASA seven-term polynomial expressions, permitting the set of thermochemical properties to be calculated over this temperature range. The accuracy of the G3B3 and G4 results is estimated to be 1 kcal/mol and the B3LYP/aug-cc-pVTZ results are of nferior quality..</div>

scholarly journals Nitrogen-doped carbon materials with cubic ordered mesostructure: low-temperature autoclaving synthesis for electrochemical supercapacitor and CO2 capture

RSC Advances ◽  
2017 ◽  
Vol 7 (21) ◽  
pp. 12524-12533 ◽  
Author(s):  
Lei Liu ◽  
Shi-Da Xu ◽  
Feng-Yun Wang ◽  
Yue-Jun Song ◽  
Jie Liu ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co2 Capture ◽  
Carbon Materials ◽  
Mesoporous Carbons ◽  
Body Centered Cubic ◽  
Ordered Mesoporous Carbons ◽  
Nitrogen Doped ◽  
Electrochemical Supercapacitor ◽  
Ordered Mesoporous ◽  
Nitrogen Doped Carbon

Nitrogen doped ordered mesoporous carbons with a 3-D body-centered cubic pore structure have been synthesized by means of a low-temperature autoclaving route under basic conditions, showing excellent performances for supercapacitors and CO2 capture.

Preparation of Carbon Nanofibers from Polyacrylonitrile Nanofibers by Electrospinning

2011 ◽  
Vol 415-417 ◽  
pp. 642-647
Author(s):  
En Zhong Li ◽  
Da Xiang Yang ◽  
Wei Ling Guo ◽  
Hai Dou Wang ◽  
Bin Shi Xu
Keyword(s):  
Electron Microscope ◽  
Carbon Nanofibers ◽  
Photoelectron Spectroscopy ◽  
Solution Concentration ◽  
Dimethyl Formamide ◽  
Ultrafine Fibers ◽  
X Ray ◽  
Scanning Electron ◽  
Pan Fibers

Ultrafine fibers were electrospun from polyacrylonitrile (PAN)/N,N-dimethyl formamide (DMF) solution as a precursor of carbon nanofibers. The effects of solution concentration, applied voltage and flow rate on preparation and morphologies of electrospun PAN fibers were investigated. Morphologies of the green fibers, stabilized fibers and carbonized fibers were compared by scanning electron microscope (SEM). The diameter of PAN nanofibers is about 450nm and the distribution of diameter is well-proportioned. Characterization of the elements changes of fibers were performed by X-ray photoelectron spectroscopy (XPS).

scholarly journals Catalytic and capacity properties of nanocomposites based on cobalt oxide and nitrogen-doped carbon nanofibers

2014 ◽  
Vol 35 (6) ◽  
pp. 960-969 ◽  
Author(s):  
Olga Yu. Podyacheva ◽  
Andrei I. Stadnichenko ◽  
Svetlana A. Yashnik ◽  
Olga A. Stonkus ◽  
Elena M. Slavinskaya ◽  
...  
Keyword(s):  
Cobalt Oxide ◽  
Carbon Nanofibers ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon
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