Hydrothermal deposition of CoFe2O4 nanoparticles on activated carbon fibers promotes atrazine removal via physical adsorption and photo-Fenton degradation

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.

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Dynamic Adsorption and Desorption of Toluene on Carbon Nanotubes Grafted Activated Carbon Fibers

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.284-287.72 ◽

2013 ◽

Vol 284-287 ◽

pp. 72-76 ◽

Cited By ~ 1

Author(s):

Yu Chun Chiang ◽

Wei Hsiang Lin

Keyword(s):

Carbon Nanotubes ◽

Activated Carbon ◽

Surface Area ◽

Carbon Fibers ◽

Physical Adsorption ◽

Fixed Bed ◽

Chemical Vapor Deposition Method ◽

Active Surface Area ◽

Activated Carbon Fibers ◽

Adsorption And Desorption

Activated carbon fibers (ACFs) are widely used adsorbents due to their small fiber diameter, uniform pore size distribution and rapid adsorption/desorption rate. In addition, carbon nanotubes (CNTs) have received much attention recently because of their excellent mechanical and electrical properties and being candidates for adsorption. Thus, it should be highly interested as grafting CNTs onto ACFs to form a hybrid adsorbent. Therefore, the objective of this paper is to investigate the physicochemical properties of ACFs grafted with nitrogen-doped CNTs (CNs) and determine the adsorption and desorption performance of toluene vapor on this hybrid adsorbent. The chemical vapor deposition method was used for growth of CNs directly onto ACFs. The resulting materials were characterized by several techniques. Next, the adsorption breakthrough behaviors of toluene on the samples were measured in a continuous flow-type fixed-bed system. And then the temperature programmed desorption system was utilized to observe the desorption characteristics of toluene from the samples. Results show that the CNs have been grafted homogeneously onto the ACFs. The attachment of CNs on ACFs was believed to block part of the active surface area, causing the decrease in specific surface area and pore volume, but lead to the increase in microporosity. The adsorption of toluene on ACFs or the hybrid adsorbent was physical adsorption. At higher adsorption temperatures, the hybrid adsorbent could maintain high enough capacities of toluene and even exceed the performance of ACFs. Moreover, toluene could be desorbed completely from ACFs and the hybrid adsorbent up to 400 oC with the highest desorption efficiency at about 180 oC.

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Electrosorption Desalination by Activated Carbon Fibers Electrode

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.1710 ◽

2012 ◽

Vol 610-613 ◽

pp. 1710-1717

Author(s):

Gui Zhong Zhou ◽

Xuan Wang ◽

Zhao Feng Wang ◽

Shu Qing Pan ◽

Shao Xiang Li

Keyword(s):

Activated Carbon ◽

Carbon Fibers ◽

Adsorption Process ◽

Removal Rate ◽

Physical Adsorption ◽

Activated Carbon Fiber ◽

Activated Carbon Fibers ◽

Initial Concentration ◽

Total Adsorption ◽

Scanning Electron

The activated carbon fiber(ACF) electrodes were prepared for electrosorption desalination. The electrodes were analyzed using scanning electron microscope (SEM), and the desalting efficiency was represented by the removal rate of Cl-. As a result, desalting efficiency decreases with increasing initial concentration of Cl-, whereas the total adsorption capacity increases. The most suitable voltage for electrosorption desalination is 1.2 ~ 1.4V. The electrosorption desalination achieves the best results while the distance between two electrodes is 1.0cm. Electrosorption plays a more important role in the adsorption process compared with physical adsorption. The removal rate of Cl- is obviously improved by using ACF electrode modified by HNO3 and KOH and desalination ratio of the electrode treated with KOH is increased by 16.5%. Therefore, the ACF electrode would be suitable for using in the application of electrosorption desalination.

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DECOMPOSITION OF NO GAS BY COPPER IMPREGNATED ACTIVATED CARBON FIBERS

Frontiers on Separation Science and Technology ◽

10.1142/9789812702623_0082 ◽

2004 ◽

Author(s):

S. K. RYU ◽

W. K. LEE ◽

S. J. PARK

Keyword(s):

Activated Carbon ◽

Carbon Fibers ◽

Activated Carbon Fibers ◽

Decomposition Of No

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

Chemistry of Materials ◽

10.1021/cm990123m ◽

1999 ◽

Vol 11 (12) ◽

pp. 3476-3483 ◽

Cited By ~ 96

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

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

Supramolecular Science ◽

10.1016/s0968-5677(98)00017-0 ◽

1998 ◽

Vol 5 (3-4) ◽

pp. 261-266 ◽

Cited By ~ 27

Author(s):

M. Endo ◽

T. Furuta ◽

F. Minoura ◽

C. Kim ◽

K. Oshida ◽

...

Keyword(s):

Activated Carbon ◽

Carbon Fibers ◽

Activated Carbon Fibers ◽

Image Processor

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.184-185.1110 ◽

2012 ◽

Vol 184-185 ◽

pp. 1110-1113 ◽

Cited By ~ 1

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.

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