scholarly journals Fabrication of Activated Carbon Fibers with Sheath-Core, Hollow, or Porous Structures via Conjugated Melt Spinning of Polyethylene Precursor

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2895
Author(s):  
Jong Sung Won ◽  
Ha Ram Lee ◽  
Min Jun Lee ◽  
Min Hong Jeon ◽  
Seung Goo Lee ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Melt Spinning ◽  
Cost Effective ◽  
Bet Surface Area ◽  
Activated Carbon Fibers ◽  
Initial Modulus ◽  
Polyethylene Fiber ◽  
Core Fiber ◽  
Sheath Structure

Using polyethylene as carbon precursor, we have fabricated cost-effective carbon fibers with a sheath-core structure via conjugate melt spinning. Low-density polyethylene (LDPE) and high-density polyethylene (HDPE) were used as the sheath and core of the fiber, respectively, while sulfonation with sulfuric acid was conducted to enable the crosslinking of polyethylene. We demonstrated that carbonization and activation of the sheath-core-structured polyethylene fiber can result in a well-developed microporous structure in the sheath layer, and due to the core-sheath structure, the resulting activated carbon fibers exhibit a high tensile strength of ~455 MPa, initial modulus of ~14.4 GPa, and Brunauer-Emmett-Teller (BET) surface area of ~1224 m2/g. Finally, activated carbon fibers with a hollow, sheath-core, and porous were successfully fabricated by controlling the degree of crosslinking of the LDPE/HDPE sheath-core fiber.

SURFACE PROPERTIES AND CATALYTIC PERFORMANCE OF ACTIVATED CARBON FIBERS SUPPORTED TiO2 PHOTOCATALYST

2008 ◽  
Vol 15 (04) ◽  
pp. 337-344 ◽  
Author(s):  
HUIFEN YANG ◽  
PINGFENG FU
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Uv Light ◽  
Three Dimensional ◽  
Catalytic Performance ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Activated Carbon Fibers ◽  
Organic Silicon ◽  
Acrylate Copolymer

Activated carbon fibers supported TiO 2 photocatalyst ( TiO 2/ACF) in felt-form was successfully prepared with a dip-coating process using organic silicon modified acrylate copolymer as a binder followed by calcination at 500°C in a stream of Ar gas. The photocatalyst was characterized by SEM, XRD, XPS, FTIR, and BET surface area. Most of carbon fibers were coated with uniformly distributed TiO 2 clusters of nearly 100 nm. The loaded TiO 2 layer was particulate for the organic binder in the compact film was carbonized. According to XPS and FTIR analysis, amorphous silica in carbon grains was synthesized after carbonizing organic silicon groups, and the Ti – O – Si bond was formed between the interface of loaded TiO 2 and silica. Additionally, the space between adjacent carbon fibers still remained unfilled after TiO 2 coating, into which both UV light and polluted solutions could penetrate to form a three-dimensional environment for photocatalytic reactions. While loaded TiO 2 amount increased to 456 mg TiO 2/1 g ACF, the TiO 2/ACF catalyst showed its highest photocatalytic activity, and this activity only dropped about 10% after 12 successive runs, exhibiting its high fixing stability of coated TiO 2.

scholarly journals Preparation of Activated Carbon Fibers from Cost Effective Commercial Textile Grade Acrylic Fibers

2011 ◽  
Vol 12 (1) ◽  
pp. 44-47 ◽  
Author(s):  
Mekala Bikshapathi ◽  
Nishith Verma ◽  
Rohitashaw Kumar Singh ◽  
Harish Chandra Joshi ◽  
Anurag Srivastava
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Cost Effective ◽  
Activated Carbon Fibers ◽  
Acrylic Fibers

Preparation and characterization of activated carbon fibers from liquefied wood by KOH activation

Holzforschung ◽  
2016 ◽  
Vol 70 (3) ◽  
pp. 195-202 ◽  
Author(s):  
Yuxiang Huang ◽  
Guangjie Zhao
Keyword(s):  
Activated Carbon ◽  
Functional Groups ◽  
Carbon Fibers ◽  
Chemical Activation ◽  
Bet Surface Area ◽  
Koh Activation ◽  
Activated Carbon Fibers ◽  
Surface Functional Groups ◽  
X Ray ◽  
Liquefied Wood

Abstract Activated carbon fibers (ACFs) have been prepared from liquefied wood (Wliq) by chemical activation with KOH, with a particular focus on the effect of KOH/fiber ratio in term of porous texture and surface chemistry. ACFs based on steam activation served as a blank for comparison. The properties of the ACFs were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), nitrogen adsorption/desorption, Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results show that the KOH-activated ACFs have rougher surfaces and more amorphous structure compared with the blank. The pore development was significant when the KOH/fiber ratio reached 3, and achieved a maximum Brunauer-Emmett-Teller (BET) surface area of 1371 m2 g-1 and total pore volume (Vtot) of 0.777 cm3 g-1, of which 45.3% belong to mesopores with diameters of 2–4 nm, while the blank activated at the same temperature had a BET surface of 1250 m2 g-1 and Vtot of 0.644 cm3 g-1, which are mainly micropores. The surface functional groups are closely associated with the KOH/fiber ratios. KOH-activated ACFs with KOH/fiber ratio of 3 have more oxygenated surface functional groups (C-O, C=O, -COOH) than the blank.

Photocatalytic Performance of Activated Carbon Fibers (ACFs) Supported La-S/TiO2 Photocatalyst

2012 ◽  
Vol 518-523 ◽  
pp. 764-767 ◽  
Author(s):  
Min Hua He ◽  
Hui Li Xia
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Synergetic Effect ◽  
Deposition Process ◽  
Activated Carbon Fiber ◽  
Bet Surface Area ◽  
Activated Carbon Fibers ◽  
Calcination Temperatures

Activated carbon fibers (ACFs) supported La-S/TiO2 nanocomposite photocatalyst was successfully prepared by coating-calcining method. The surface morphology, microstructure and optic properties of the sample were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), BET surface area and UV–Vis diffuse reflectance spectroscopy (UV–Vis). The characteristic results confirmed that La-S/TiO2 powders were deposited on activated carbon fiber homogeneously, and the micrographic structure and surface properties of ACFs had not been damaged by the deposition process and calcination at high temperatures. Furthermore, anatase-form TiO2 was uniquely developed even as calcination temperatures reached 700°C. Experiments indicated that the ACFs supported La-S/TiO2 nanocomposite photocatalyst calcined at 450°C for 2h showed higher photocatalytic activity in photodegradation of phenol aqueous solution than La-S/TiO2 powder catalyst. The improvement may be explained in terms of synergetic effect on the stronger adsorption ability of ACFs and efficient photocatalytic performance of La-S/TiO2.

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.

Oxidation of Activated Carbon Fibers:  Effect on Pore Size, Surface Chemistry, and Adsorption Properties

1999 ◽  
Vol 11 (12) ◽  
pp. 3476-3483 ◽  
Author(s):  
Christian L. Mangun ◽  
Kelly R. Benak ◽  
Michael A. Daley ◽  
James Economy
Keyword(s):  
Activated Carbon ◽  
Surface Chemistry ◽  
Pore Size ◽  
Carbon Fibers ◽  
Adsorption Properties ◽  
Activated Carbon Fibers

Visualized observation of pores in activated carbon fibers by HRTEM and combined image processor

1998 ◽  
Vol 5 (3-4) ◽  
pp. 261-266 ◽  
Author(s):  
M. Endo ◽  
T. Furuta ◽  
F. Minoura ◽  
C. Kim ◽  
K. Oshida ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Activated Carbon Fibers ◽  
Image Processor

Preparation and Characterization of Activated Carbon Fibers from Jute Fibers by Phosphoric Acid Activation

2012 ◽  
Vol 184-185 ◽  
pp. 1110-1113 ◽  
Author(s):  
Li Fen He ◽  
Qi Xia Liu ◽  
Tao Ji ◽  
Qiang Gao
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Phosphoric Acid ◽  
Carbon Fibers ◽  
Activated Carbon Fibers ◽  
Optimum Conditions ◽  
Activation Time ◽  
Activation Temperature ◽  
Jute Fibers ◽  
Activating Agent

Various jute-based activated carbon fibers were prepared by using jute fibers as raw materials and phosphoric acid as activating agent. The effects of three main factors such as concentration of activating agent, activation temperature and activation time on the yield and adsorptive properties of active carbon fibers were investigated via orthogonal experiments. The surface physical morphology of jute-based activated carbon fiber was also observed by using Scanning Electron Microscope. Results showed that the optimum conditions were phosphoric acid concentration of 4 mol/L, activation temperature of 600 °C and activation time of 1h. The yield, iodine number and amount of methylene blue adsorption of the active carbon fiber prepared under optimum conditions were 37.99 %, 1208.87 mg/g and 374.65 mg/g, respectively.

HCl removal using activated carbon fibers electroplated with silver

Carbon ◽  
2004 ◽  
Vol 42 (10) ◽  
pp. 2113-2115 ◽  
Author(s):  
Soo-Jin Park ◽  
Sung-Yeol Jin
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Activated Carbon Fibers ◽  
Hcl Removal
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