scholarly journals Asymmetric Electrodes Constructed with PAN-Based Activated Carbon Fiber in Capacitive Deionization

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Mingzhe Li ◽  
Yingzhi Chen ◽  
Zheng-Hong Huang ◽  
Feiyu Kang
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Capacitive Deionization ◽  
Reverse Voltage ◽  
Forward Voltage ◽  
Adsorption Ability ◽  
Low Energy Consumption ◽  
Asymmetric Electrodes

Capacitive deionization (CDI) method has drawn much attention for its low energy consumption, low pollution, and convenient manipulation. Activated carbon fibers (ACFs) possess high adsorption ability and can be used as CDI electrode material. Herein, two kinds of PAN-based ACFs with different specific surface area (SSA) were used for the CDI electrodes. The CDI performance was investigated; especially asymmetric electrodes’ effect was evaluated. The results demonstrated that PAN-based ACFs showed a high electrosorption rate (complete electrosorption in less than half an hour) and moderate electrosorption capacity (up to 0.2 mmol/g). CDI experiments with asymmetric electrodes displayed a variation in electrosorption capacity between forward voltage and reverse voltage. It can be attributed to the electrical double layer (EDL) overlap effect and inner pore potential; thus the ions with smaller hydrated ionic radius can be adsorbed more easily.

Effect of Activated Carbon Fiber Properties on Ca2+ Removal by Capacitive Deionization

2014 ◽  
Vol 700 ◽  
pp. 281-285
Author(s):  
Qing Jun Gao ◽  
Xue Xin Liu ◽  
Lei Yuan ◽  
Kai Zhang
Keyword(s):  
Activated Carbon ◽  
Specific Capacitance ◽  
Surface Area ◽  
Carbon Fibers ◽  
Pore Volume ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Capacitive Deionization ◽  
Average Pore ◽  
Fiber Properties

Three activated carbon fibers, namely Sample A, B, and C, were used as electrodes for Ca2+ removal by capacitive deionization in this study. The physical properties of ACFs were comprehensively investigated with regard to surface area, pore volume, pore size distribution, specific capacitance, and contact angle. An internal correlation was intended to reveal between the ACF properties and their CDI performance. Pseduo-first-order adsorption kinetics model could successfully depict the Ca2+ removal with different ACF electrodes. Based on the fitting parameters, Sample B with the highest pore volume, specific capacitance, and hydrophilicity exhibited the highest equilibrium electrosorption capacity (9.977 mg-Ca2+/g-ACF). However, Sample A with the highest average pore diameter (2.4 nm) has the highest rate constant (0.074/min). Even though the abundant micropores with diameters less than 2 nm created large specific surface area in Sample C, its uptake of Ca2+ was not as good as that of Sample A.

scholarly journals Enhanced Photo-Catalytic Performance of Activated Carbon Fibers for Water Treatment

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1794 ◽  
Author(s):  
Konstantinos V. Plakas ◽  
Athina Taxintari ◽  
Anastasios J. Karabelas
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Treatment Time ◽  
Catalytic Performance ◽  
Dip Coating ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Tio2 Sample ◽  
Phenol Adsorption ◽  
Electrophoretic Coating

The synthesis, characterization, and performance of composite photocatalytic adsorbents are investigated in this work using the dip-coating and the electrophoretic coating methods for the deposition of titanium dioxide (TiO2) on porous activated carbon fiber (ACF) substrates. The adsorption and photocatalytic efficiency of the synthesized catalytic adsorbents were compared using phenol as the model pollutant. Both immobilization techniques resulted in composite ACF/TiO2 adsorbents characterized by large surface area (844.67 ± 45.58 m2 g−1), uniform distribution of TiO2 nanoparticles on the activated carbon fibers, and high phenol adsorption. The method and the treatment time affected the phenol adsorption, while the highest sorption was determined in the case of the ACF/TiO2 sample prepared by the electrophoretic coating method (at 20 V) for an electrolysis time of 120 s (7.93 mgphenol g−1ACF/TiO2). The UV-A irradiation of most ACF/TiO2 samples led to a faster removal of phenol from water as a result of the combined sorption and heterogeneous photocatalysis. The stability and the effective regeneration of the most promising composite photocatalytic adsorbent was proved by multiple filtration and UV-A irradiation cycles.

scholarly journals Preparation and photocatalytic activity characterization of activated carbon fiber–BiVO4 composites

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24665-24672 ◽  
Author(s):  
Chencheng Zhang ◽  
Pingfang Han ◽  
Xiaoping Lu ◽  
Qinghui Mao ◽  
Jiangang Qu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Performance Evaluation ◽  
Activated Carbon ◽  
Carbon Fibers ◽  
Photocatalytic Performance ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Experimental Conditions ◽  
Characterization Of Activated Carbon

Herein, we describe the hydrothermal immobilization of BiVO4 on activated carbon fibers, using Reactive Black KN-B photocatalytic performance evaluation and establishing the experimental conditions yielding maximalphotocatalytic activity.

Regeneration of Activated Carbon Fiber Using Microwave under Vacuum Condition

2013 ◽  
Vol 373-375 ◽  
pp. 2019-2023
Author(s):  
Quan Li Feng ◽  
Chen Xu Wang ◽  
Xue Qian Wang ◽  
Ping Ning
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Mass Loss ◽  
Carbon Fibers ◽  
Irradiation Time ◽  
Vacuum Condition ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Total Mass Loss ◽  
Microwave Regeneration

The purpose of this work was to explore the application of microwaves for the regeneration of activated carbon fibers saturated with ethanol under vacuum condition. The efficacy of the regeneration was analyzed by the rate of desorption and mass loss. When the microwave power was 680W , the dosage of activated carbon fiber was 3.5g , the degree of vacuum is 0.05MPa and the microwave irradiation time was 180s, the desorption rate was up to 95.3% and the outlet concentration of ethanol was 97.5%. The adsorption of activated carbon fiber after microwave regeneration for many times was larger than the fresh activated carbon fiber. And the rate of total mass loss was 3.54%.

Electrosorption Desalination by Activated Carbon Fibers Electrode

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.

scholarly journals Surface Modification of Activated Carbon Fibers with Fe3O4 for Enhancing Their Electromagnetic Wave Absorption Property

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Xuefeng Yan ◽  
Tao Ji ◽  
Wei Ye
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Absorption Rate ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Wave Absorption ◽  
Absorbing Materials ◽  
Pure Fe3o4 ◽  
Porous Activated Carbon

In this study, the porous activated carbon fiber (ACF) is prepared by viscose fiber, and Fe3O4 coating is deposited on the surface of ACF through in situ hybridization to prepare carbon/magnetic electromagnetic (EM) wave absorption materials. Compared with pure Fe3O4 and ACF, the EM wave absorption rate is improved. When the solubility of FeCl3 is 2 mol/L and the thickness of the prepared ACF–Fe3O4(3) EM wave absorption material is 3 mm, the EM wave loss at 10 GHz reaches −44.3 dB and effective EM wave absorption bandwidths ( reflection   loss   RL < − 10  dB and RL < − 20  dB) reached 4.8 GHz (8.8–13.6 GHz) and 1.1 GHz (9.3–10.4 GHz), respectively. The prepared ACF-based composite material has a light structure and strong absorption bandwidth. Findings can provide references for the research on other EM wave-absorbing materials.

The Catalytic Reduction of Nitrogen Oxide Over the Catalysts Supported on Activated Carbon Fibers

1994 ◽  
Vol 344 ◽  
Author(s):  
Yun Lu ◽  
Ruowen Fu ◽  
Yishan Chen ◽  
Hanmin Zeng
Keyword(s):  
Nitric Oxide ◽  
Activated Carbon ◽  
Carbon Fiber ◽  
Nitrogen Oxide ◽  
Carbon Fibers ◽  
Catalytic Reduction ◽  
Activated Carbon Fiber ◽  
Activated Carbon Fibers ◽  
Catalytic Activities ◽  
Composite Series

AbstractCopper-series, nickel-series, and copper-cobalt composite-series catalysts supported on activated carbon fiber were prepared in this paper. Their structures and catalytic activities for the reduction of nitric oxide with ammonia were investigated simultaneously.

Adsorption and Separation Research of CO2/CH4 on Modified Activated Carbon Fiber

2014 ◽  
Vol 986-987 ◽  
pp. 13-16
Author(s):  
Qin Yuan ◽  
Hong Hong Yi ◽  
Xiao Long Tang ◽  
Kai Li ◽  
Fen Rong Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Adsorption Property ◽  
Activated Carbon Fiber ◽  
Separation Performance ◽  
Activated Carbon Fibers ◽  
Modified Activated Carbon ◽  
Chemical Reagents ◽  
Modified Adsorbents

In this paper, activated carbon fibers were modified by different chemical reagents. The modified adsorbents were used to investigate adsorption and separation performance of CO2/CH4 gases mixture, and then it could get the best modified adsorbent. The experimental results show that amine can't great grafting on activated carbon fiber. Compared with blank activated carbon fibers, the adsorption property of CO2 did not have much influence on the activated carbon fiber modified by amine. However, it can increase the nitrogen functional groups and the specific surface area on the surface of activated carbon fiber that were modified with nitric acid and ammonia. The above two points were conductive to the adsorption and separation of CO2/CH4 mixture gases.

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.

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