Porous texture evolution in activated carbon fibers prepared from poly (p-phenylene benzobisoxazole) by carbon dioxide activation

2008 ◽  
Vol 116 (1-3) ◽  
pp. 622-626 ◽  
Author(s):  
M. Beatriz Vázquez-Santos ◽  
Alberto Castro-Muñiz ◽  
Amelia Martínez-Alonso ◽  
Juan M.D. Tascón
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Carbon Fibers ◽  
Texture Evolution ◽  
Activated Carbon Fibers ◽  
Porous Texture ◽  
Carbon Dioxide Activation

scholarly journals Porous Texture Evolution in Nomex-Derived Activated Carbon Fibers

2002 ◽  
Vol 252 (1) ◽  
pp. 169-176 ◽  
Author(s):  
S. Villar-Rodil ◽  
R. Denoyel ◽  
J. Rouquerol ◽  
A. Martı́nez-Alonso ◽  
J.M.D. Tascón
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Texture Evolution ◽  
Activated Carbon Fibers ◽  
Porous Texture

scholarly journals Carbon Dioxide Adsorption on Porous and Functionalized Activated Carbon Fibers

2019 ◽  
Vol 9 (10) ◽  
pp. 1977 ◽  
Author(s):  
Yu-Chun Chiang ◽  
Cheng-Yu Yeh ◽  
Chih-Hsien Weng
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Pore Volume ◽  
Co2 Adsorption ◽  
Physical Adsorption ◽  
Koh Activation ◽  
Co2 Uptake ◽  
Activated Carbon Fibers

Polyacrylonitrile-based activated carbon fibers (ACFs), modified using potassium hydroxide (KOH) or tetraethylenepentamine (TEPA), were investigated for carbon dioxide (CO2) adsorption, which is one of the promising alleviation approaches for global warming. The CO2 adsorption isotherms were measured, and the values of isosteric heat of adsorption were calculated. The results showed that the KOH-modified ACFs exhibited a great deal of pore volume, and a specific surface area of 1565 m2/g was obtained. KOH activation made nitrogen atoms easily able to escape from the surface of ACFs. On the other hand, the surface area and pore volume of ACFs modified with TEPA were significantly reduced, which can be attributed to the closing or blocking of micropores by the N-groups. The CO2 adsorption on the ACF samples was via exothermic reactions and was a type of physical adsorption, where the CO2 adsorption occurred on heterogeneous surfaces. The CO2 uptakes at 1 atm and 25 °C on KOH-activated ACFs reached 2.74 mmole/g. This study observed that microporosity and surface oxygen functionalities were highly associated with the CO2 uptake, implying the existence of O-C coordination, accompanied with physical adsorption. Well cyclability of the adsorbents for CO2 adsorption was observed, with a performance decay of less than 5% over up to ten adsorption-desorption cycles.

Utilization of carbon dioxide onto activated carbon fibers for surface modification

2019 ◽  
Vol 30 (1) ◽  
pp. 99-105 ◽  
Author(s):  
Joon Hyuk Lee ◽  
Soon Hong Lee ◽  
Dong Hack Suh
Keyword(s):  
Carbon Dioxide ◽  
Surface Modification ◽  
Activated Carbon ◽  
Carbon Fibers ◽  
Activated Carbon Fibers

The Effect of Oxidation Temperature on Activating Commercial Viscose Rayon-Based Carbon Fibers to Make the Activated Carbon Fibers (ACFs)

2020 ◽  
Vol 985 ◽  
pp. 171-176
Author(s):  
Le Hoang Vu ◽  
Huu Son Nguyen ◽  
Quoc Khanh Dang ◽  
Van Cuong Pham ◽  
Thai Hung Le
Keyword(s):  
Carbon Dioxide ◽  
Activated Carbon ◽  
Surface Area ◽  
Carbon Fibers ◽  
Viscose Rayon ◽  
Bet Surface Area ◽  
Activated Carbon Fibers ◽  
Toxic Chemical ◽  
Viscose Fibers ◽  
Chemical Prevention

In this work, commercial Viscose (cellulosic based precursor) rayon-based carbon fibers were oxidized to make activated carbon fibers (ACFs). Carbon fibers were made from Viscose fibers in carbonization process at 1200°C. The ultimate carbon fibers possessed carbon content above 94 mass% and fiber dimension about 8 mm. These fibers were activated to make ACFs by oxidizing gas such as steam of carbon dioxide. The experiments were conducted at temperature ranged from 800°C to 900°C with carbonic steam’s flow of 3 l.min-1. The vaporous benzene adsorbability of activated carbon fibers was then measured by Mark Bell method. The adsorbability (a) and specific surface area (ABET) of ACFs were determined. The properties of the produced ACFs were investigated and analyzed by SEM and TEM imaging. The results showed that obtained fibers have maximum benzene adsorbability of 4.58 mmol.g-1 and BET surface area reached 1357 m2.g-1. These activated carbon fibers were able to use for toxic chemical prevention equipment.

Regeneration of PAN-based activated carbon fibers by thermal treatments in air and carbon dioxide

1995 ◽  
Vol 10 (8) ◽  
pp. 1969-1976 ◽  
Author(s):  
Tse-Hao Ko ◽  
P. Chiranairadul
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Activated Carbon ◽  
Carbon Fibers ◽  
Structural Changes ◽  
Dye Adsorption ◽  
Activated Carbon Fiber ◽  
Thermal Treatments ◽  
Activated Carbon Fibers ◽  
Regeneration Processes

PAN-based activated carbon fibers were saturated by dye adsorption and then were regenerated by thermal treatment in carbon dioxide and in air. The dye adsorption and the regeneration were carried out in several cycles. The changes in fiber physical properties and the capacity of dye adsorption will be discussed. Activated carbon fibers regenerated in air had greater dye adsorption and weaker mechanical properties than those regenerated in carbon dioxide. The preferred orientation changed slightly during air reactivation, but it decreased gradually after carbon dioxide regeneration. The regeneration processes led to a decrease in the weight and degradation of mechanical properties, but the processes increased the capacity of dye adsorption. After the second regeneration, the dye adsorption capacity of activated carbon fibers that were recycled by air regeneration was 15% higher than those that were recycled by carbon dioxide regeneration. But, after the third regeneration, the fibers recycled by air regeneration lost their mechanical properties. For carbon dioxide regeneration, fibers retained satisfactory mechanical properties even after the fourth regeneration. This study indicates that multiple effective applications can be accomplished with carbon dioxide treatment in place of air regeneration. The structural changes of activated carbon fiber during different regenerations are proposed.

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