Effect of Viscoelastic Behavior on Electroconductivity of Recycled Activated Carbon Composites

2011 ◽  
Vol 70 ◽  
pp. 231-236 ◽  
Author(s):  
Takenobu Sakai ◽  
Tomohiko Gushiken ◽  
Jun Koyanagi ◽  
Rolando Rios-Soberanis ◽  
Tomoki Masuko ◽  
...  
Keyword(s):  
Composite Material ◽  
Activated Carbon ◽  
Composite Materials ◽  
Activated Carbons ◽  
Viscoelastic Behavior ◽  
Intimate Relationship ◽  
Carbon Composites ◽  
Stress Relaxation Behavior ◽  
Carbon Particles ◽  
The Relationship

In the Waterworks Bureau, the activated carbon has been used for filtering water. After the life service of activated carbon, it is normally disposed. This work focuses on the processing of a composite material in order to recycle these wasted carbon particles. These activated carbons were used for the filler of composite materials, and a composite with carbon contents of 10% ~ 60% was manufactured and characterized. They exhibited electroconductive behavior because of the carbon particles used as fillers. The electroconductivity have an intimate relationship with the strain of the material. However, because of the composite viscoelasticity, the electroconductivity presented changes by their stress relaxation behavior with the same strain. In this study, it was revealed the relationship between the viscoelasticity and the electroconductivity of recycled activated carbon composites.

scholarly journals ‘In-Situ’ Preparation of Carbonaceous Conductive Composite Materials Based on PEDOT and Biowaste for Flexible Pseudocapacitor Application

2020 ◽  
Vol 4 (3) ◽  
pp. 87
Author(s):  
Francisco J. González ◽  
Andreina Montesinos ◽  
Javier Araujo-Morera ◽  
Raquel Verdejo ◽  
Mario Hoyos
Keyword(s):  
Activated Carbon ◽  
Composite Materials ◽  
In Situ Polymerization ◽  
Activated Carbons ◽  
Spray Coating ◽  
Energy Storage Density ◽  
Conductive Composite ◽  
In Situ Preparation ◽  
Spent Grain

Composite materials of poly(3,4-ethylenedioxythiophene) (PEDOT)/activated carbon (AC) were prepared by ‘in-situ’ polymerization and subsequently deposited by spray-coating onto a flexible electrolyte prepared in our laboratories. Two activated carbons were tested: a commercial activated carbon and a lab-made activated carbon from brewer’s spent grain (BSG). The porous and spongy structure of the composite increased the specific surface area, which helps to enhance the energy storage density. This procedure to develop conductive composite materials using AC prepared from biowaste has the potential to be implemented for the preparation of polymer-based conductive inks for further applications as electrodes in pseudocapacitors.

scholarly journals Adsorption of acetaldehyde from air by activated carbon and carbon fibers

2021 ◽  
Vol 27 (2) ◽  
pp. 200549-0
Author(s):  
Soohyung Park ◽  
Muhammad Yaqub ◽  
Seunghan Lee ◽  
Wontae Lee
Keyword(s):  
Composite Material ◽  
Activated Carbon ◽  
Composite Materials ◽  
Carbon Fibers ◽  
Selective Absorption ◽  
Activated Carbon Fibers ◽  
Adsorption Efficiency ◽  
Dry Conditions ◽  
Dry And Wet Conditions ◽  
Coated Carbon

The adsorption of acetaldehyde from air using various activated carbon and carbon fibers was investigated in this study. These adsorbents included activated carbon (AC), carbon fibers (CFs), activated carbon fibers (ACFs), and metal-coated carbon fibers (MCCFs) supplied by different manufacturers. AC was categorized as AC1, AC2, AC3, and AC4, CFs were denoted as ACF1, while ACFs and MCCFs were expressed as ACF2 and ACF3, respectively. Five composite materials were prepared using the AC and ACFs in different ratios, and experiments were conducted to assess their acetaldehyde adsorption efficiency under dry and wet conditions. The results showed that the acetaldehyde adsorption efficiency of an impregnated AC4 was higher (95.9%) than that of both non-impregnated AC1 and AC3 and an impregnated AC2 after 1 min of operation. ACF2 showed a higher acetaldehyde adsorption efficiency (50.9%) as compared to ACF1 and ACF3 because of its larger surface area and selective absorption capability after 1 min of operation. A composite material comprising 6.3 g of AC4 and 1 g of ACF2 showed the highest adsorption efficiency of 97.9% under dry conditions. However, this adsorption efficiency significantly decreased under wet conditions.

scholarly journals DEFORMATION ABILITY OF SINGLE POINT INCREMENTAL FORMING FOR THEMO-PLASTIC COMPOSITE MATERIALS

2011 ◽  
Vol 14 (2) ◽  
pp. 5-12
Author(s):  
Trung Van Pham ◽  
Cuong Van Vo ◽  
Dien Khanh Le ◽  
Nang Van Nguyen ◽  
Tuan Dinh Phan ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Simulation Model ◽  
Incremental Forming ◽  
Fiber Type ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Plastic Composite ◽  
Deformation Ability ◽  
The Relationship

The studies of theory and simulation for composite materials have not yet built model for analyzing the effects of temperature’s influence on the deformation ability of these materials. The article focused on studying the relationship between temperatures and deformation ability of composite sheets in SPIF method, building and analyzing simulation model, determining the limited deformation angle according to the temperatures and building the chart of limited forming for the polypropylene (PP) glass fiber type E mat composite material.

scholarly journals Activated Carbon as an Adsorbent for the Separation of Low-Molecular Weight Alkyl Halides from Ground Water in the Production of Drinking Water. II. The Relationship between the Adsorption Capacity for Trichloroethene of Virgin and Regenerated Activated Carbons, and Their Achievement in the Purification of Deep-Well Ground Water

1988 ◽  
Vol 5 (4) ◽  
pp. 289-296 ◽  
Author(s):  
Th. Roncken ◽  
A. Roebers ◽  
R. Hopman ◽  
C.L. de Ligny ◽  
B.G. Dekker ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Ground Water ◽  
Adsorption Capacity ◽  
Activated Carbons ◽  
Alkyl Halides ◽  
Low Molecular Weight ◽  
Time Intervals ◽  
Deep Well ◽  
A Charge ◽  
The Relationship

Activated carbon can be used for the separation of trichloroethene from contaminated deep-well ground water. When the activated carbon has become saturated with trichloroethene, it may be regenerated (i.e., purified from trichloroethene) by the manufacturer. After regeneration, it can be used again. It is shown that the activated carbon deteriorated gradually upon regeneration. Successive regenerations became necessary after ever-decreasing time intervals, and the amount of trichloroethene adsorbed from the ground water decreased gradually. It appears that the efficiency in the separation of trichloroethene from ground water of the regenerated activated carbons is proportional to their adsorption capacity for trichloroethene at equilibrium. This relationship can be used to predict the efficiency of a charge of regenerated activated carbon in the separation of trichloroethene from deep-well ground water.

Preparation and Properties of Paraffin/Activated Carbon Composites as Phase Change Materials for Thermal Energy Storage

2012 ◽  
Vol 608-609 ◽  
pp. 1049-1053 ◽  
Author(s):  
Liang Zhao ◽  
Xiang Chen Fang ◽  
Gang Wang ◽  
Hong Xu
Keyword(s):  
Activated Carbon ◽  
Energy Storage ◽  
Composite Materials ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Energy Storage Materials ◽  
Carbon Composites ◽  
Good Thermal Stability

Paraffin/activated carbon composites as phase change energy storage materials were prepared by absorbing paraffin into activated carbon. In composite materials, paraffin was used as phase change material (PCM) for thermal energy storage, and activated carbon acted as supporting material, ethanol was the solvent. A series of characterization were conducted to analyse and test the performance of the composite materials, and differential scanning calorimeter (DSC) results showed that the PCM-2 composite has the melting latent heat of 51.7 kJ/kg with melting temperature of 60.4°C. Due to the capillary and surface tension forces between paraffin and activated carbon, the leakage of melted paraffin from the composites can be prevented. In a word, the paraffin/activated carbon composites have a good thermal stability and can be used repeatedly.

scholarly journals Production of Aluminum Matrix Composite Material by Active Carbon Additive

2021 ◽  
Author(s):  
Ayman M. S. EISAY ◽  
AYDIN TÜRKYILMAZ
Keyword(s):  
Composite Material ◽  
Activated Carbon ◽  
Composite Materials ◽  
Chemical Activation ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
The Matrix ◽  
Experimental Process ◽  
Aluminum Matrix Composite Material

Abstract The effectiveness of composite materials with the addition of activated carbon produced from biomaterial with a new application on aluminum-based composite materials was investigated in this study.Activated carbon was produced from the peanut shells via the chemical activation method and the obtained activated carbon was mixed with aluminum and composite material. For the characterization of the composite material obtained, XRD and SEM-EDS optical photographs were assessed in the experimental process. According to Vickers Hardness and Dynamic Micro Hardness results, the sample with the hardness value of 2% AC added had the highest hardness value. The elastic modulus values was found to increase by 3.4 times (9.59GPa) compared to aluminum with the addition of 2% activated carbon. This increases with activated carbon quantity, and weakens the matrix structure due to weak van der waals interaction with aluminum, which reduces hardness; therefore, the best ratio of the activated carbon reinforcement to the aluminum matrix was obtained at 2% activated carbon addition.

Use of activated carbon to remove undesirable residual amylase from refinery streams

2017 ◽  
pp. 96-103 ◽  
Author(s):  
Gillian Eggleston ◽  
Isabel Lima ◽  
Emmanuel Sarir ◽  
Jack Thompson ◽  
John Zatlokovicz ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
High Performance ◽  
Activated Carbons ◽  
Amylase Activity ◽  
Sugar Industry ◽  
End User ◽  
Customer Complaints ◽  
Carry Over ◽  
Very High

In recent years, there has been increased world-wide concern over residual (carry-over) activity of mostly high temperature (HT) and very high temperature (VHT) stable amylases in white, refined sugars from refineries to various food and end-user industries. HT and VHT stable amylases were developed for much larger markets than the sugar industry with harsher processing conditions. There is an urgent need in the sugar industry to be able to remove or inactivate residual, active amylases either in factory or refinery streams or both. A survey of refineries that used amylase and had activated carbon systems for decolorizing, revealed they did not have any customer complaints for residual amylase. The use of high performance activated carbons to remove residual amylase activity was investigated using a Phadebas® method created for the sugar industry to measure residual amylase in syrups. Ability to remove residual amylase protein was dependent on the surface area of the powdered activated carbons as well as mixing (retention) time. The activated carbon also had the additional benefit of removing color and insoluble starch.

Effect of Polyphosphate on Removal of Endocrine-Disrupting Chemicals of Nonylphenol and Bisphenol-A by Activated Carbons

2005 ◽  
Vol 40 (4) ◽  
pp. 484-490 ◽  
Author(s):  
Keun J. Choi ◽  
Sang G. Kim ◽  
Chang W. Kim ◽  
Seung H. Kim
Keyword(s):  
Activated Carbon ◽  
Bisphenol A ◽  
Surface Charge ◽  
Activated Carbons ◽  
Endocrine Disrupting Chemicals ◽  
Dipole Interaction ◽  
High Affinity ◽  
Calcium Polyphosphate ◽  
Endocrine Disrupting ◽  
Positively Charged

Abstract This study examined the effect of polyphosphate on removal of endocrine-disrupting chemicals (EDCs) such as nonylphenol and bisphenol-A by activated carbons. It was found that polyphosphate aided in the removal of nonylphenol and bisphenol- A. Polyphosphate reacted with nonylphenol, likely through dipole-dipole interaction, which then improved the nonylphenol removal. Calcium interfered with this reaction by causing competition. It was found that polyphosphate could accumulate on carbon while treating a river. The accumulated polyphosphate then aided nonylphenol removal. The extent of accumulation was dependent on the type of carbon. The accumulation occurred more extensively with the wood-based used carbon than with the coal-based used carbon due to the surface charge of the carbon. The negatively charged wood-based carbon attracted the positively charged calcium-polyphosphate complex more strongly than the uncharged coal-based carbon. The polyphosphate-coated activated carbon was also effective in nonylphenol removal. The effect was different depending on the type of carbon. Polyphosphate readily attached onto the wood-based carbon due to its high affinity for polyphosphate. The attached polyphosphate then improved the nonylphenol removal. However, the coating failed to attach polyphosphate onto the coal-based carbon. The nonylphenol removal performance of the coal-based carbon remained unchanged after the polyphosphate coating.

Study of the Composite Materials Optimal Structure Containing a Hollow Aluminum and Silica Microsphere Dependence on Humidity

2020 ◽  
Vol 12 ◽  
Author(s):  
Alexandra Atyaksheva ◽  
Yermek Sarsikeyev ◽  
Anastasia Atyaksheva ◽  
Olga Galtseva ◽  
Alexander Rogachev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Strength Function ◽  
Theory And Practice ◽  
Optimal Structure ◽  
Optimal Size ◽  
Structure And Properties ◽  
Power Functions ◽  
Silica Microsphere ◽  
Heat Engineering

Aims:: The main goals of this research are exploration of energy-efficient building materials when replacing natural materials with industrial waste and development of the theory and practice of obtaining light and ultra-light gravel materials based on mineral binders and waste dump ash and slag mixtures of hydraulic removal. Background.: Experimental data on the conditions of formation of gravel materials containing hollow aluminum and silica microsphere with opportunity of receipt of optimum structure and properties depending on humidity with the using of various binders are presented in this article. This article dwells on the scientific study of opportunity physical-mechanical properties of composite materials optimization are considered. Objective.: Composite material contains hollow aluminum and silica microsphere. Method.: The study is based on the application of the method of separation of power and heat engineering functions. The method is based on the use of the factor structure optimality, which takes into account the primary and secondary stress fields of the structural gravel material. This indicates the possibility of obtaining gravel material with the most uniform distribution of nano - and microparticles in the gravel material and the formation of stable matrices with minimization of stress concentrations. Experiments show that the thickness of the cement shell, which performs power functions, is directly related to the size of the raw granules. At the same time, the thickness of the cement crust, regardless of the type of binder, with increasing moisture content has a higher rate of formation for granules of larger diameter. Results.: The conditions for the formation of gravel composite materials containing a hollow aluminosilicate microsphere are studied. The optimal structure and properties of the gravel composite material were obtained. The dependence of the strength function on humidity and the type of binder has been investigated. The optimal size and shape of binary form of gravel material containing a hollow aluminosilicate microsphere with a minimum thickness of a cement shell and a maximum strength function was obtained. Conclusion.: Received structure allows to separate power and heat engineering functions in material and to minimize the content of the excited environment centers.

scholarly journals 1.8 V Aqueous Symmetric Carbon-Based Supercapacitors with Agarose-Bound Activated Carbons in an Acidic Electrolyte

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1731
Author(s):  
Chih-Chung Lai ◽  
Feng-Hao Hsu ◽  
Su-Yang Hsu ◽  
Ming-Jay Deng ◽  
Kueih-Tzu Lu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Sulfuric Acid ◽  
Energy Density ◽  
Activated Carbons ◽  
High Energy ◽  
Aqueous Electrolytes ◽  
Alternative Material ◽  
Aqueous Cells ◽  
Acidic Electrolyte ◽  
Cycling Behavior

The specific energy of an aqueous carbon supercapacitor is generally small, resulting mainly from a narrow potential window of aqueous electrolytes. Here, we introduced agarose, an ecologically compatible polymer, as a novel binder to fabricate an activated carbon supercapacitor, enabling a wider potential window attributed to a high overpotential of the hydrogen-evolution reaction (HER) of agarose-bound activated carbons in sulfuric acid. Assembled symmetric aqueous cells can be galvanostatically cycled up to 1.8 V, attaining an enhanced energy density of 13.5 W h/kg (9.5 µW h/cm2) at 450 W/kg (315 µW/cm2). Furthermore, a great cycling behavior was obtained, with a 94.2% retention of capacitance after 10,000 cycles at 2 A/g. This work might guide the design of an alternative material for high-energy aqueous supercapacitors.

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