Effect of KOH Activation on the Formation of Oxygen Structure in Activated Carbons Synthesized from Polymeric Precursor

2002 ◽  
Vol 250 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Soo-Jin Park ◽  
Woo-Young Jung
Keyword(s):  
Activated Carbons ◽  
Koh Activation ◽  
Polymeric Precursor

Effect of Activation Agents on COD Reduction Using Activated Carbon from Agricultural Residue

2020 ◽  
Vol 1010 ◽  
pp. 453-458
Author(s):  
Mohd Zazmiezi Mohd Alias ◽  
Rozidaini Mohd Ghazi ◽  
Nik Raihan Nik Yusoff ◽  
Mohd Hafiz Jamaludin
Keyword(s):  
Activated Carbon ◽  
Phosphoric Acid ◽  
Potassium Hydroxide ◽  
Activated Carbons ◽  
Oxygen Demand ◽  
Koh Activation ◽  
Ftir Analysis ◽  
Agricultural Residue ◽  
Cod Reduction ◽  
Activating Agent

This study investigated the effect of activating agent on activated carbon preparation and potential chemical oxygen demand (COD) reduction using activated carbons (AC) prepared. Zinc chloride, phosphoric acid and potassium hydroxide were utilized in impregnation of bamboo and rice husk. Result of SEM-EDX, FTIR as well as COD reduction were compared and discussed. The SEM displayed highest porosity in AC using KOH activation. FTIR analysis displayed obvious difference for each activation. AC using KOH activation obtained highest COD reduction.

scholarly journals Biomass based porous carbon for supercapacitor by hydrothermal assisted activating method

2021 ◽  
Vol 236 ◽  
pp. 01016
Author(s):  
Congcong Huang ◽  
Yunhui Dong ◽  
Xingjun Dong
Keyword(s):  
Electrode Material ◽  
High Performance ◽  
Activated Carbons ◽  
High Capacity ◽  
Rate Capability ◽  
High Energy ◽  
High Energy Density ◽  
Koh Activation ◽  
Electrochemical Performances ◽  
Adsorption Desorption

A facile route has been employed to synthesize a series of high performance activated carbons as the electrode material for supercapacitors. The structure of the carbons are characterized by N2 adsorption/desorption and FTIR spectroscopy. The electrochemical performances of the carbons as an electrode material were evaluated by cyclic voltammetry test and galvanostatic charge/discharge measurements. As a biomass derived carbon, KOH-1 exhibits high capacity, good rate capability and high energy density, indicating the promising application of hydrothermal combining with KOH activation method for biomass materials that used in supercapacitors

scholarly journals CHARACTERIZATION AND CIPROFLOXACIN ADSORPTION PROPERTIES OF ACTIVATED CARBONS PREPARED FROM VARIOUS AGRICULTURAL WASTES BY KOH ACTIVATION

2020 ◽  
Vol 54 (7-8) ◽  
pp. 811-819
Author(s):  
TO-UYEN T. DAO ◽  
◽  
HONG-THAM T. NGUYEN ◽  
DUYEN THI CAM NGUYEN ◽  
HANH T.N. LE ◽  
...  
Keyword(s):  
Activated Carbons ◽  
Adsorption Properties ◽  
Agricultural Wastes ◽  
Koh Activation

scholarly journals Preparation and characterization of activated carbons from biomass material – giant knotweed (Reynoutria sachalinensis)

2015 ◽  
Vol 13 (1) ◽  
Author(s):  
Hanna Fałtynowicz ◽  
Jan Kaczmarczyk ◽  
Marek Kułażyński
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Activated Carbons ◽  
Bet Surface Area ◽  
Koh Activation ◽  
Volume Distribution ◽  
Porous Texture ◽  
Giant Knotweed ◽  
Reynoutria Sachalinensis ◽  
Area And Volume

AbstractActivated carbons from biomass material of giant knotweed Reynoutria sachalinensis (F. Schmidt ex Maxim.) Nakai were obtained. Use of this plant for manufacturing activated carbon has not been studied yet. Therefore, the first activated carbons of giant knotweed origin are described. Both physicochemical (by steam and CO2) and chemical (by KOH) activation methods were applied. Influences of temperature (500, 600, 700 and 800°C), burn-off [10, 25 and 50 wt. % (daf)] and KOH concentration on pores surface area and volume distribution of the obtained activated carbons were explored. Porosity of the elaborated sorbents was determined by benzene and carbon dioxide sorption measurements. Sorbents obtained by steam activation were micro- and mesoporous with surface area and volume of pores increasing with temperature and burn-off to V = 0.351 cm3 g-1 and S = 768 m2 g-1 at 800°C at 50% burn-off. Carbon dioxide activation resulted with notably microporous activated carbons with porous texture parameters also increasing with burn-off to V = 0.286 cm3 g-1 and S = 724 m2 g-1 at 50% burn-off. The highest BET surface area of 2541 m2 g-1 was achieved when chemical (KOH) activation was performed using KOH to char ratio 4:1.

Preparation of Activated Carbons for Electrochemical Capacitors by Microwave Heating

2011 ◽  
Vol 704-705 ◽  
pp. 1061-1067
Author(s):  
Bao Lin Xing ◽  
Lun Jian Chen ◽  
Chuan Xiang Zhang ◽  
Hui Guo
Keyword(s):  
Specific Capacitance ◽  
Microwave Heating ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Activated Carbons ◽  
Electrochemical Capacitors ◽  
Weight Ratio ◽  
Heating Time ◽  
Koh Activation ◽  
Electrochemical Characteristics

Activated carbons (ACs) were prepared from lignite by microwave heating with KOH as activation agent, the effects of the weight ratio of KOH to coal and microwave heating time on the pore structure of ACs were investigated by N2 adsorption. The electrochemical characteristics of electrochemical capacitors (ECs) with ACs as electrodes in 3mol/L KOH electrolyte were evaluated by galvanostatic charge/discharge cycling, cyclic voltammetry and electrochemical impedance spectroscopy. The results show that the BET specific surface area and total pore volume of ACs (denoted as AC-R3) can reach 2097m2/g and 1.19cm3/g respectively when the weight ratio of KOH to coal is 3:1 and the microwave heating time is 10 min. The ECs with AC-R3 as electrodes presents a high specific capacitance of 335F/g at a low current density of 50mA/g and still remains 288F/g even at a high current density of 5A/g, it has excellent cycling stability and low leakage current, and the residual specific capacitance is as high as 93.6% after 1000 cycles under the current density of 2.5A/g. The results have demonstrated that the microwave heating with KOH activation is an efficient approach to prepare ACs with high performance for ECs. Keywords: Activated Carbons; Microwave Heating; Electrochemical Capacitors; Electrochemical Characteristics

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