A study on pore formation of high surface area activated carbon prepared by microwave-induced plasma with KOH (MiWP-KOH) activation: Effect of temperature-elevation rate

2021 ◽  
pp. 108511
Author(s):  
Purichaya Kuptajit ◽  
Noriaki Sano ◽  
Kyuya Nakagawa ◽  
Tetsuo Suzuki
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Pore Formation ◽  
High Surface ◽  
High Surface Area ◽  
Effect Of Temperature ◽  
Koh Activation ◽  
Temperature Elevation ◽  
Activation Effect ◽  
Microwave Induced Plasma

scholarly journals Structural Flexibility in Activated Carbon Materials Prepared under Harsh Activation Conditions

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1988 ◽  
Author(s):  
Fabiano Gomes Ferreira de Paula ◽  
Ignacio Campello-Gómez ◽  
Paulo Fernando Ribeiro Ortega ◽  
Francisco Rodríguez-Reinoso ◽  
Manuel Martínez-Escandell ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Structural Changes ◽  
Organic Molecules ◽  
Carbon Materials ◽  
High Surface ◽  
High Surface Area ◽  
Koh Activation ◽  
3D Network ◽  
Activation Conditions

Although traditionally high-surface area carbon materials have been considered as rigid structures with a disordered three dimensional (3D) network of graphite microdomains associated with a limited electrical conductivity (highly depending on the porous structure and surface chemistry), here we show for the first time that this is not the case for activated carbon materials prepared using harsh activation conditions (e.g., KOH activation). In these specific samples a clear structural re-orientation can be observed upon adsorption of different organic molecules, the structural changes giving rise to important changes in the electrical resistivity of the material. Whereas short chain hydrocarbons and their derivatives give rise to an increased resistivity, the contrary occurs for longer-chain hydrocarbons and/or alcohols. The high sensitivity of these high-surface area carbon materials towards these organic molecules opens the gate towards their application for sensing devices.

scholarly journals Preparation and CO2Sorption of a High Surface Area Activated Carbon Obtained from the KOH Activation of Finger Citron Residue

2012 ◽  
Vol 30 (2) ◽  
pp. 183-191 ◽  
Author(s):  
Wei Dai ◽  
Yuchen Liu ◽  
Wei Su ◽  
Gengshen Hu ◽  
Gang Deng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Koh Activation

Utilization of walnut shell as a feedstock for preparing high surface area activated carbon by microwave induced activation: effect of activation agents

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Hongying Xia ◽  
Song Cheng ◽  
Libo Zhang ◽  
Jinhui Peng
Keyword(s):  
Activated Carbon ◽  
Microwave Heating ◽  
Surface Area ◽  
Chemical Activation ◽  
High Surface ◽  
High Surface Area ◽  
Walnut Shell ◽  
Activation Effect

AbstractThe present work attempts to convert walnut shell into a high surface area activated carbon by microwave heating and chemical activation. Different activation agents such as KOH, NaOH, K

Preparation of high surface area-activated carbon from lignin of papermaking black liquor by KOH activation for Ni(II) adsorption

2013 ◽  
Vol 217 ◽  
pp. 345-353 ◽  
Author(s):  
Yuan Gao ◽  
Qinyan Yue ◽  
Baoyu Gao ◽  
Yuanyuan Sun ◽  
Wenyu Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
High Surface ◽  
Black Liquor ◽  
High Surface Area ◽  
Koh Activation

Preparation of High Surface Area Activated Carbon from Spent Phenolic Resin by Microwave Heating and KOH Activation

2018 ◽  
Vol 37 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Song Cheng ◽  
Libo Zhang ◽  
Shengzhou Zhang ◽  
Hongying Xia ◽  
Jinhui Peng
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Microwave Power ◽  
Phenolic Resin ◽  
High Surface ◽  
High Surface Area ◽  
Raw Material ◽  
Bet Surface Area ◽  
Koh Activation ◽  
Microwave Assisted

AbstractThe spent phenolic resin is as raw material for preparing high surface area activated carbon (HSAAC) by microwave-assisted KOH activation. The effects of microwave power, activation duration and impregnation ratio (IR) on the iodine adsorption capability and yield of HSAAC were investigated. The surface characteristics of HSAAC were characterized by nitrogen adsorption isotherms, FTIR, SEM and TEM. The operating variables were optimized utilizing the response surface methodology (RSM) and were identified to be microwave power of 700 W, activation duration of 15 min and IR of 4, corresponding to a yield of 51.25 % and an iodine number of 2,384 mg/g. The pore structure parameters of the HSAAC, i. e., Brunauer–Emmett–Teller (BET) surface area, total pore volume, and average pore diameter were estimated to be 4,269 m2/g, 2.396 ml/g and 2.25 nm, respectively, under optimum conditions. The findings strongly support the feasibility of microwave-assisted KOH activation for preparation of HSAAC from spent phenolic resin.

High Cr(VI) Adsorption Performance of Coal-Based Activated Carbon in Aqueous Solution

2013 ◽  
Vol 798-799 ◽  
pp. 1123-1127
Author(s):  
Hua Lei Zhou ◽  
Qiong Qiong Zhu ◽  
Dong Hua Huang
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Pore Structure ◽  
Ph Value ◽  
High Surface ◽  
High Surface Area ◽  
Koh Activation ◽  
Transmission Electron ◽  
Mesoporous Adsorbent ◽  
Initial Ph

The activated carbon with high surface area was prepared by KOH activation from anthracite and used as adsorbent for removal of Cr (VI) from aqueous solution. The pore structure and surface properties were characterized by N2 adsorption at 77K, transmission electron microscope (TEM) and Fourier transform infrared spectroscopy ( FTIR). Effect of pH and isotherms at different temperature were investigated. Results show that the prepared carbon is a microporous-and mesoporous-adsorbent with developed pore structure and abundant surface oxygen-containing groups. PH value of the solution plays key function on the adsorption. The chemical adsorption dominates the adsorption process. The activated carbon exhibits much higher Cr adsorption capacity than the commercial activated carbon at initial pH of ~3. The equilibrium adsorption data are fitted by both Freundlich model and Langmuir model well.

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