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Artykuły w czasopismach na temat „KOH activation”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Liu, Pengbo, Shuo Sun, Sheng Huang, et al. "KOH Activation Mechanism in the Preparation of Brewer’s Spent Grain-Based Activated Carbons." Catalysts 14, no. 11 (2024): 814. http://dx.doi.org/10.3390/catal14110814.

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Understanding the mechanism of KOH activation in the preparation of activated carbon (AC) enables more efficient utilization of biomass. In this study, brewer’s spent grains (BSGs) were carbonized at 500 °C to produce biochar (BC), followed by KOH activation under different activation conditions. The gas and solid products generated during the activation process were analyzed by gas chromatography (GC), X-ray diffraction (XRD), Raman analysis, a surface area and pore size analyzer, and X-ray photoelectron spectroscopy (XPS). The results show that increasing the KOH/BC ratio or the activation t

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2

Ouyang, Shu Guang, Le Le Fu, and Zhi Wang. "Study on Activated Carbon Prepared from Coking Fly Ash with KOH Activation." Advanced Materials Research 490-495 (March 2012): 3540–44. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.3540.

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An orthogonal experiment is conducted to study the effect of activation temperature, activation time and the ratio of KOH to carbon material (i.e. the mass ratio of KOH to coking fly ash) on the adsorption capacities of the activated carbon made by using coking fly ash as the raw material and KOH the activating agent. The results show that the three factors can be ordered as activation temperature, activation time and the ratio of KOH to carbon material according to the significance in their effect on preparation of activated carbon from coking fly ash. In addition, the optimum activation temp

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3

Ghiffari, Mochammad, Wenny Maulina, and Agung Tjahjo Nugroho. "Study of Dielectric and Adsorption Properties of Activated Carbon Prepared from Water Hyacinth using KOH as an Activating Agent." Computational And Experimental Research In Materials And Renewable Energy 3, no. 1 (2020): 38. http://dx.doi.org/10.19184/cerimre.v3i1.26417.

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Activated carbon can be produced from the combustion of a materials containing carbon that has been activated using activator substances. In this paper, potassium hydroxide (KOH) was selected as an activating agent. The influence of KOH concentration was investigated to determine the dielectric and adsorption properties of activated carbon derived from water hyacinth. Drying water hyacinth was carbonize in the furnace at a temperature of 400°C followed by chemical activation with variation concentration of KOH solution that used are 25%, 30%, and 35% (w/v) respectively. The results show that t

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4

Astuti, Widi, Irene Nindita Pradnya, Ria Wulansarie, et al. "Preparation of Magnetic Activated Carbons from Cassava Peel using H3PO4 and KOH Activation by Microwave Heating for Naphthol Blue-Black Adsorption." Trends in Sciences 21, no. 2 (2023): 7078. http://dx.doi.org/10.48048/tis.2024.7078.

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To address the separation problems and produce the reusable adsorbent, cassava peel magnetic activated carbon (MAC) prepared via microwave-assisted activation has been proposed to replace activated carbon (AC) for naphthol blue-black removal. To create MACs, ACs were embedded with nano-sized magnetite particles using co-precipitation methods. In this sense, 2 different activating agents (i.e., H3PO4 and KOH) have been used. H3PO4 activation provides a larger pore size and more functional groups, while KOH activation provides a larger surface area and higher porosity. The increase of H3PO4 conc

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5

Ardianti, Aprillia Dwi, and Rizka Nur Faila. "CHARACTERIZATION OF SALAK WEDI ACTIVATED CARBON STRUCTURE USING KOH AND ZnCl2 ACTIVATOR." ROTOR 16, no. 1 (2023): 1. http://dx.doi.org/10.19184/rotor.v16i1.35250.

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Activated carbon can be made from a variety of organic and inorganic raw materials. One of the organic materials with great potential in the manufacture of activated carbon is the bark of salak wedi(Salacca Zalacca). The purpose of this study was to determine the physical characteristics of the activated carbon of salak wedi peel which has been chemically activated using KOH and ZnCl2 with the process of being activated once using only KOH or ZnCl2 and multilevel activation using a combination of KOH and ZnCl2 to determine the number of pores in the sample and to determine the presence of a cr

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6

Maulida, Hikmah, Elwina Elwina, and Fachraniah Fachraniah. "Pembuatan Karbon Aktif Dari Limbah Kulit Jeruk Manis (Citrus sinensis L) Sebagai Adsorben Ion Besi (Fe2+) Dalam Air Sumur." Jurnal Riset, Inovasi, Teknologi & Terapan 2, no. 1 (2024): 23. http://dx.doi.org/10.30811/ristera.v2i1.4970.

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This research aims to utilize sweet orange peel waste as an adsorbent of Fe2+ in the form of activated carbon by reviewing the adsorbate characteristics based on absorption capacity of I2, moisture content and ash content, the effect of H2SO4 and KOH activators on adsorption capacity and removal efficiency of Fe2+ ion and adsorption kinetics of Fe2+ ion in well water samples. The fixed variable is the weight of the adsorbent, which is temperature of 315 ° C, 50 grams, particle size of 10 ± 32 mesh, volume of adsorbate 10 liters and flow rate of 4 liters / minute. The independent variable is H2

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7

Yuliusman, Nasruddin, H. I. Naf’an, J. Sinto, and Y. W. Nugroho. "Utilization of crown pineapple waste as raw material preparation of activated carbon as adsorbent in natural gas storage." E3S Web of Conferences 67 (2018): 02018. http://dx.doi.org/10.1051/e3sconf/20186702018.

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Activated carbon used as natural gas storage in adsorbed natural gas technology due to physical adsorption properties. Pineapple crown was used as raw material for activated carbon by reason of high lignocellulose content. The purpose of this study is to produce high surface area of activated carbon with high carbon composition (up to 80% weight). Activated carbon were prepared through chemical activation using KOH with various weight ratio and physical activation using N2 with 150 ml/min flowrate. Carbonization of pineapple crown is done at 350°C followed by chemical activation with KOH activ

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8

Agustina, S., A. Yulianto, A. Kamil, et al. "Corn cob usage as activated carbon using KOH as activator." IOP Conference Series: Earth and Environmental Science 1266, no. 1 (2023): 012082. http://dx.doi.org/10.1088/1755-1315/1266/1/012082.

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Abstract The value of agroindustry waste like corn cob can be added as raw material for produced activated carbon. Activated carbon can be used as adsorbent in food, pharmacy, cosmetic industries, and waste water treatment. This research was conducted by using KOH as activator in the activation process for produced of activated carbon from corn cob. The methods include several steps, first step was particle size reduction. Second step was carbonization process in 500° C for an hour. Third step was activation process using solid KOH and liquid KOH, then heated at 900° C. Then, it will be washed

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9

Yuningsih, Lela Mukmilah, Dikdik Mulyadi, and A. Jaka Kurnia. "Pengaruh Aktivasi Arang Aktif dari Tongkol Jagung dan Tempurung Kelapa Terhadap Luas Permukaan dan Daya Jerap Iodin." Jurnal Kimia VALENSI 2, no. 1 (2016): 30–34. http://dx.doi.org/10.15408/jkv.v2i1.3091.

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The activated charcoal can be produced from various raw material which contains carbon such as corn cobs and coconut shell. Generally, activated charcoal made through activation process with added chemical materials. The kind of activator will give different influence on surface area or pores volume of the result activated charcoal. In this study, will be made activated charcoal from corn cobs and activated by physical and chemical with KOH activator. Carbonation process is performed at 800oC for 2 hours and followed by chemical activation process by KOH with mass ratio water: charcoal: KOH is

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10

Jha, Shivangi, Falguni Pattnaik, Oscar Zapata, Bishnu Acharya, and Ajay K. Dalai. "KOH-Assisted Chemical Activation of Camelina Meal (Wild Flax) to Treat PFOA-Contaminated Wastewater." Sustainability 17, no. 5 (2025): 2170. https://doi.org/10.3390/su17052170.

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This study is constituted of the chemical activation of camelina meal (CM) biochar and the utilization of these activated carbon for the adsorption of perfluorooctanoic acid (PFOA) from water. Camelina meal, a sustainable agro-based byproduct, underwent slow pyrolysis and subsequent chemical activation with potassium carbonate (K2CO3), potassium hydroxide (KOH), and sodium hydroxide (NaOH). Among these chemical activating agents, KOH emerged as the one of most efficient activating agents, yielding activated carbon with superior surface properties and significantly higher carbon content. After

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11

Dwidiani, Ni Made, I. Nyoman Gede Wardana, Ngakan Gede Putu Suardana, I. Gusti Ngurah Nitya Santhiarsa, and Relius Zakaria Sibarani. "Pb Adsorption of Coffee Peel Derived Activated Carbon by Varying KOH Concentration." EPI International Journal of Engineering 7, no. 1 (2024): 1–4. https://doi.org/10.25042/epi-ije.022024.01.

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Turning biomass waste into added value product is crucial as it is not only beneficial to the environment but also to the economy. Coffee peel is a waste that has excellent potential to produce activated carbon. Activated carbon is carbon that has gone through an activation process and has a large surface area and higher adsorption rate. The high need for activated carbon in overcoming waste problems makes it useful to reduce its environmental impact. Activated carbon is widely used in water filtration including heavy metal Pb and Cd. The aim of this research is to study the impact of KOH conc

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12

Chang, Siyu, Lei Wang, and Lihong Yao. "Properties of Sunflower Straw Biochar Activated Using Potassium Hydroxide." Molecules 30, no. 6 (2025): 1332. https://doi.org/10.3390/molecules30061332.

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Biochar is a kind of carbon material with a wide range of sources; it has attracted considerable attention because of its abundant resources and low cost. Potassium hydroxide (KOH) is a strong alkali activator that can effectively change the surface chemical properties and microstructure of biochar. Biochar activated by KOH has a large specific surface area (SSA) and a rich pore structure. Herein, sunflower straw was used as a raw material and KOH as an activator to investigate the preparation of sunflower straw biochar activated by KOH. The effects of synthetic conditions on the performance a

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13

Tahreen, Amina, Mohammed Saedi Jami, Fathilah Ali, and Zahangir Alam. "MORINGA OLEIFERA (MO) SEED SHELL BASED ADSORBENT FOR POTENTIAL CO2 CAPTURE: A CHARACTERIZATION STUDY." Malaysian Journal of Science 43, sp1 (2024): 38–43. http://dx.doi.org/10.22452/mjs.vol43sp1.7.

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This study characterizes activated carbon synthesized from Moringa oleifera (MO) seed husk with a greener activating agent, namely sodium carbonate, (Na2CO3) compared to traditional activating agent, potassium hydroxide (KOH). Synthesized in a conventional tube furnace with nitrogen supply, the resulting activated carbon after cooling and washing, were characterized for Brunauer-Emmett-Teller (BET), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) analyses and compared with that produced with KOH activation. Although fewer and large

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14

Yoon, Seong-Ho, Seongyop Lim, Yan Song, et al. "KOH activation of carbon nanofibers." Carbon 42, no. 8-9 (2004): 1723–29. http://dx.doi.org/10.1016/j.carbon.2004.03.006.

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Mohd Alias, Mohd Zazmiezi, Rozidaini Mohd Ghazi, Nik Raihan Nik Yusoff, and Mohd Hafiz Jamaludin. "Effect of Activation Agents on COD Reduction Using Activated Carbon from Agricultural Residue." Materials Science Forum 1010 (September 2020): 453–58. http://dx.doi.org/10.4028/www.scientific.net/msf.1010.453.

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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.

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16

Bakti, Andi Ikhtiar, Handy Indra Regain Mosey, and Jumriadi Jumriadi. "Characterization and Analysis of Activated Carbon from Coconut Shells Applied to Supercapacitors." Sainstek : Jurnal Sains dan Teknologi 15, no. 2 (2023): 128. http://dx.doi.org/10.31958/js.v15i2.10605.

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Activated carbon is used materials as an electrode for supercapacitors. The aim of this research is to characterize and analyze activated carbon for results with high specific surface area, chemical resistance, electrical conductivity, and affordability. The pyrolysis technique is used in the activation process to remove water content and achieve optimal carbonization at an activation temperature of 600°C. For chemical activation, the carbon is immersed in 10% KOH and 10% Na2CO3 activating agents. The X-RD results in crystalline phases of graphite at peaks 25° and 44°, showing diffraction peak

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17

Pagketanang, Thanchanok, Prasong Wongwicha, and Mallika Thabuot. "Characteristics of Activated Carbon Produced from Rubber Seed Shell by Using Different Methods of Chemical Activation with KOH." Applied Mechanics and Materials 781 (August 2015): 659–62. http://dx.doi.org/10.4028/www.scientific.net/amm.781.659.

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Rubber-seed shell was selected as the precursor for the preparation of activated carbon by chemical activation with KOH as an activating agent. Impregnation-Activation Method and Carbonization-Impregnation-Activation Method were investigated with different concentration of KOH solution. Rubber-seed shell activated carbons were characterized by using scanning electron microscope, fourier transform infared spectroscopy and nitrogen adsorption isotherms. The results present that the first method which impregnation of precursor in 2%wt. KOH solution with the ratio of 300 g/l for 24 hrs before ther

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18

Xu, Beibei, Min Chang, Chengguo Fu, et al. "Effect of Preparation Process on the Physicochemical Properties of Activated Carbon Prepared from Corn Stalks." Agriculture 14, no. 3 (2024): 392. http://dx.doi.org/10.3390/agriculture14030392.

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The preparation of activated carbon (AC) from agricultural and forestry wastes is one of the effective methods for resource utilization. In this study, AC was prepared from corn stalk (CS) by pyrolysis, one-step activation, and two-step activation to determine the optimum preparation method. Based on this, a single-factor design was used to investigate the influence of activating agents (KOH, NaOH, KOH/NaOH), activation temperatures (600, 700, 800 °C), and activation times (60, 90, 120 min) on the physicochemical properties of AC. The physicochemical properties of AC were characterized by Ther

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19

Liu, Jing, Mei Li Du, and Yu Hu Zhong. "Study on Activation Agent Impact for Activated Semi-Coke Structure." Advanced Materials Research 791-793 (September 2013): 20–23. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.20.

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Study on the impact of activation agent for Activated semi-coke structure Activated semi-coke were prepared choosing KOH and ZnCl2 as activating agent by orthogonal experiments, and the effect on properties of activated were also be researched. The influence of different activating agents for activated semi-coke the structure of activated semi-coke were analyzed by using SEM and FTIR. Performance and structure of ZnCl2 activated semi-coke were compared with KOH activated .The result showed that ZnCl2 activated semi-coke and KOH activated were obviously different. The former have developed in m

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20

Awitdrus, Gladys May Grace Siregar, Agustino, et al. "KOH Activation with Microwave Irradiation and its Effect on the Physical Properties of Orange Peel Activated Carbon." Journal of Physics: Conference Series 2049, no. 1 (2021): 012025. http://dx.doi.org/10.1088/1742-6596/2049/1/012025.

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Abstract Chemical activation with assisted microwave irradiation was used to produced activated carbon from orange peel waste. The activating agent was potassium hydroxide (KOH) with concentrations of 2 M, 3 M, and 4 M. The microwave irradiation was done for 15 minutes with a 630 Watt output power. KOH concentration affected the physical properties of OP-ACxM. With increasing KOH concentration, the interlayer spacing (d002 and d100 ) grew, stack height (Lc ) increased, and stack width (La) dropped. The number of pores on the surface of OP-ACxM increased after the chemical activation process. I

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Purbasari, Aprilina, Tjokorde Walmiki Samadhi, and Yazid Bindar. "The Effect of Alkaline Activator Types on Strength and Microstructural Properties of Geopolymer from Co-Combustion Residuals of Bamboo and Kaolin." Indonesian Journal of Chemistry 18, no. 3 (2018): 397. http://dx.doi.org/10.22146/ijc.26534.

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Geopolymer as a Portland cement substitute had been synthesized from alkaline activation of co-combustion residuals of bamboo and kaolin. Types of used alkaline activators were NaOH solution, KOH solution, a mixture of NaOH solution-water glass, and a mixture of KOH solution-water glass. Geopolymer with NaOH solution as activator had a compressive strength which was higher compared to geopolymer with KOH solution as an activator. However, geopolymer with NaOH solution-water glass as activator had a compressive strength which was lower compared to geopolymer with KOH solution-water glass as act

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22

Wang, Bo Tao. "Preparation and Characterization of Microporous Activated Carbon from Raw Petroleum Cokes." Materials Science Forum 814 (March 2015): 286–91. http://dx.doi.org/10.4028/www.scientific.net/msf.814.286.

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Adopting the chemical activation method, the high specific surface area activated carbon (AC) was prepared by the solid mixing method using Daqing petroleum cokes as raw materials and KOH as activator. The influence of the ratio of KOH to carbon, activation temperature and activation time on the iodine and methylene blue adsorption properties of the AC were studied. The micro-graphitic structure of the AC was studied by X-ray diffraction (XRD). The BET specific surface area, BJH pore size distribution and pore volume of the AC were determined by N2 adsorption (at 77K). The experimental results

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23

Ateş, Funda, and Öznur Özcan. "Preparation and Characterization of Activated Carbon from Poplar Sawdust by Chemical Activation: Comparison of Different Activating Agents and Carbonization Temperature." European Journal of Engineering Research and Science 3, no. 11 (2018): 6–11. http://dx.doi.org/10.24018/ejers.2018.3.11.939.

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Activated carbons were prepared from poplar sawdust by chemical activation using ZnCl2, H3PO4 or KOH. The influence of activating agents, carbonization temperatures ranging from 500 ºC to 800 ºC, and mass ratio of chemical agent to precursor (1:1 and 2:1) on the porosity of activated carbons were studied. The properties of the carbons were characterized by adsorption/desorption of nitrogen to determine the BET areas, scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR). It was determined that the surface morphology and textural characteristics of activated car

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Ateş, Funda, and Öznur Özcan. "Preparation and Characterization of Activated Carbon from Poplar Sawdust by Chemical Activation: Comparison of Different Activating Agents and Carbonization Temperature." European Journal of Engineering and Technology Research 3, no. 11 (2018): 6–11. http://dx.doi.org/10.24018/ejeng.2018.3.11.939.

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Activated carbons were prepared from poplar sawdust by chemical activation using ZnCl2, H3PO4 or KOH. The influence of activating agents, carbonization temperatures ranging from 500 ºC to 800 ºC, and mass ratio of chemical agent to precursor (1:1 and 2:1) on the porosity of activated carbons were studied. The properties of the carbons were characterized by adsorption/desorption of nitrogen to determine the BET areas, scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR). It was determined that the surface morphology and textural characteristics of activated car

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Widiastuti, Nurul, and Indri Susanti. "Activation of zeolite-Y templated carbon with KOH to enhance the CO2 adsorption capacity." Malaysian Journal of Fundamental and Applied Sciences 15, no. 2 (2019): 249–53. http://dx.doi.org/10.11113/mjfas.v15n2.914.

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This research was aimed to activate zeolite-Y templated carbon (ZTC-Y) with potassium hydroxide (KOH) at variation weight ratios of KOH(g)/KTZ-Y(g) at 0.5, 1, 1.5 and 2, in order to enhance the carbon dioxide (CO2) adsorption capacity on the material. ZTC-Y was synthesized via impregnation method by carbonization. The activation was performed by heating of impregnated ZTC-Y with KOH at 800°C for 1 hour, followed by acid washing to remove inorganic salt. ZTC-Y before and after activation were characterized by X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and Brunauer–Emmett–Teller

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Adi Saputra, Dendi, Hari Yulzakri, Adjar Pratoto, et al. "The Effect of Activating Agent and Activation Temperature on the Characteristics of Palm Empty Fruit Bunch Charcoal as CO<sub>2</sub> Adsorbent." Key Engineering Materials 1010 (March 26, 2025): 105–12. https://doi.org/10.4028/p-8kihlh.

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The escalating levels of atmospheric carbon dioxide (CO2) emissions and the consequential threat of global warming necessitate urgent measures for CO2 reduction. This study explores the development of CO2 adsorbents from biomass, specifically charcoal derived from empty palm bunches, focusing on the impact of different activating agents and activation temperatures on their properties. The research methodology involves the hydrothermal carbonization of empty palm fruit bunches followed by activation using three different materials: potassium hydroxide (KOH), urea, and a combination of KOH and u

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Luo, Siyi, Lin Liu, Yanggang Song, et al. "Effect of Activation Pretreatment on the Pyrolysis Behavior of Sludge." Journal of Biobased Materials and Bioenergy 14, no. 4 (2020): 461–66. http://dx.doi.org/10.1166/jbmb.2020.1989.

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In the present research, TG and FTIR were used to study the effect of chemical activation pretreatment on sludge pyrolysis. The results showed that both acidic and alkaline activation promoted sludge pyrolysis. KOH inhibited the elimination of crystallization water and promoted the release of volatiles. On the other hand, H2SO4 favored the separation of crystallization water and the release of volatiles. Low concentrations of the activator promoted the production of combustible gas and inhibited the generation of CO2. By analyzing the activation energy of the pyrolysis process using the Coats-

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Zhang, Jian Qiu, Song Hang Liu, Jian Hua Zu, Chao Song, and Cheng Bing Yu. "Research on Preparation of Activated Carbon from Thermosetting Epoxy Circuit Board." Applied Mechanics and Materials 692 (November 2014): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amm.692.396.

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The activated carbon was prepared by the two-steps carbonization-activation process with printed circuit board (PCB), using KOH, K2CO3, NaOH and Na2CO3 as activators. The influence of temperature, reaction time and the ratio between activator and material on methylene blue value was discussed. Box-behnken design was applied using Design-Expert software to optimize the conditions of preparation according to Response Surface Methodology (RSM).Results showed that activated carbon prepared by chemical activation with KOH or NaOH achieved higher adsorption of methylene blue.

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Dang, Dan, Lei Mei, Gaimeng Yan, and Wenju Liu. "Synthesis of Nanoporous Biochar from Rice Husk for Adsorption of Methylene Blue." Journal of Chemistry 2023 (September 22, 2023): 1–11. http://dx.doi.org/10.1155/2023/6624295.

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In this study, rice husk charcoal prepared with KOH and KOH-NaOH as activators were investigated as adsorbents for the removal of methylene blue from aqueous solutions in order to improve the utilisation of rice husk. Firstly, the rice husk carbon was morphologically and chemically characterised using scanning electron microscopy, specific surface area analyser, and infrared spectroscopy. Secondly, the effects of the alkali-carbon ratio, pyrolysis temperature, and pyrolysis time on the activation of KOH alone and combined activation of KOH-NaOH were investigated. The results showed that the ad

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Suárez-García, F., J. I. Paredes, M. Pérez-Mendoza, J. Nauroy, A. Martínez-Alonso, and J. M. D. Tascón. "Porosity Development in Carbon Nanofibers by Physical and Chemical Activation." Journal of Nano Research 17 (February 2012): 211–27. http://dx.doi.org/10.4028/www.scientific.net/jnanor.17.211.

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In this Work we Have Compared the Effects of Physical Activation with CO2and Chemical Activation with KOH on Porosity Development in Vapor Grown Carbon Nanofibers (CNFs). both Physical and Chemical Activations Result in Micro- and Mesoporosity Development in the Studied Cnfs. under this Work’s Conditions, Chemical Activation with KOH Was More Efficient than Physical Activation with CO2in Terms of Surface Area Increase Regarding the Fresh Material (7.5-Fold versus 4-Fold, Respectively, under the Optimal Conditions Found for each Type of Activation). Atomic Force Microscopy Indicated that, altho

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Fan, Ming Xia, Xiao Ling Chen, Jing Jing Chen, and Lei Mao. "Effects of Activation Conditions on Preparation of Coal Tar Pitch Based Mesoporous Activated Carbon Using Template and KOH Activation Method." Advanced Materials Research 634-638 (January 2013): 2170–75. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2170.

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Mesopores are essential to improve transport of molecules within porous network and to facilitate adsorption of larger molecules. Mesoporous activated carbons (MACs) were prepared by template synthesis and KOH activation, using modified coal tar pitch and nanosized silica as carbon precursor and imprinting template respectively. The influences of different activation conditions, including KOH/C mass ratio, activation temperature and activation time on the pore structure of MACs have been studied. The SBET, total volume and mesopore volume of the result MAC were 1356 m2/g, 0.910mL/g and 0.704 m

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Moon, Sook Young, Myung Soo Kim, Hyun Sik Hahm, and Yun Soo Lim. "Preparation of Activated Carbon Fibers by Chemical Activation Method with Hydroxides." Materials Science Forum 510-511 (March 2006): 750–53. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.750.

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Activated carbon fibers were prepared from stabilized PAN-based fibers by chemical activation using hydroxides at different concentrations. The experimental data showed variations in specific surface area, microstructure, pore size distribution, and amounts of iodine adsorbed by the activated carbon fibers. Specific surface area of about 2244m2/g and iodine adsorption of 1202mg/g were obtained in the KOH 1.5M. However, the use of NaOH in the activation process rather than KOH and using the same time/ temperature profiles resulted in a carbon with a much lower surface area. KOH is a more develo

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Puari, Aninda Tifani. "Laboratory solid waste from practical activity as activated carbon precursor for reducing methylene blue in the laboratory wastewater." Jurnal Temapela 3, no. 2 (2021): 73–79. http://dx.doi.org/10.25077/temapela.3.2.73-79.2020.

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Activated carbon (AC) from agricultural waste has become one promising way to produce AC regarding to low price of the precursor and its effect to environment. In this research, the solid waste from the basic biology practical in UPT. Basic and Central Laboratory, Andalas University (Unand) was utilized as the precursor for producing low price AC. The activation was done by chemical activation using three different activating agents which were zink chloride (ZnCl2), phosphoric acid (H3PO4), potassium hydroxide (KOH). The carbonization process was done at temperature of 700°C. The precursor and

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Mokhtar, Mohd Fikri, Erny Haslina Abd Latib, Suriati Sufian, and Ku Zilati Ku Shaari. "Preparation of Activated Carbon from Durian Shell and Seed." Advanced Materials Research 626 (December 2012): 887–91. http://dx.doi.org/10.4028/www.scientific.net/amr.626.887.

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This study presents the preparation of activated carbon from durian shell (DShAC) and durian seed (DSeAC) based by chemical activation with potassium hydroxide (KOH) as an activating agent under the nitrogen flow. In order to find the optimum physical characteristics, variation in concentration of KOH, carbonization temperature and duration time was employed. The result shows that activated carbon from durian waste is a promising activated carbon as the highest yield was obtained from the carbonization process that occurs at 400C for four hours with the KOH concentration is 0.6 M.

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Sarkar, Mamon, Chao Tian, and M. Sarwar Jahan. "Activated carbon from potassium hydroxide spent liquor lignin using phosphoric acid." February 2018 17, no. 02 (2018): 63–69. http://dx.doi.org/10.32964/tj17.02.63.

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Activated carbon was prepared by phosphoric acid (H3PO4) activation of potassium hydroxide (KOH) pulping spent liquor lignin from rice straw and compared with KOH hydroxide activation. The process parameters, such as impregnation ratio, activation temperature, and activation time were varied and their effects on the yield of activated carbon and iodine number were studied. The activated carbon prepared by H3PO4 at 800°C for 60 min at an impregnation ratio of 2.5 reached a Brunauer-Emmett-Teller (BET) surface area of 1063 m2/g, including pore diameter of 14.4 nm, iodine number of 525 mg/g, and

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Sudibandriyo, Mahmud, and L. Lydia. "Karakteristik luas permukaan karbon aktif dari ampas tebu dengan aktivasi kimia." Jurnal Teknik Kimia Indonesia 10, no. 3 (2018): 149. http://dx.doi.org/10.5614/jtki.2011.10.3.6.

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Surface area characterization of activated carbon from sugarcane baggase by chemical activationAdsorption is one the process with many applications in the industries such as in a separation or in gas storage. In this adsorption, adsorbent selection is the most important thing. One of the adsorbent most suitable for this process is activated carbon. Previous studies show that high surface area of activated carbon can be produced from sugarcane bagasse using activator ZnCl2. The research’s goal is to produce activated carbon from sugarcane bagasse and determine the effects of activator on the su

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Liu, Lu, Yali Zheng, Peng Gong, Guangcai Shao, and Xu Huang. "Influence of preparation conditions on the physical structure and surface properties of enteromorpha clathrate bio-char." MATEC Web of Conferences 358 (2022): 01032. http://dx.doi.org/10.1051/matecconf/202235801032.

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Bio-char with rich pore structure was obtained by pyrolysis of enteromorpha clathrate (EC) and subsequent activation process. The effect of pyrolysis methods, KOH concentrations used in activation and heating rate was studied. A new method that combined pyrolysis and activation into one step was proposed. The bio-char obtained via slow pyrolysis at 450°C and 700°C had a certain pore structure. The bio-char obtained via fast pyrolysis had almost no effective pore structure and a large amount of organic matters still exist in the bio-char, while it had the largest specific surface area after act

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Zhang, Qing, Kuihua Han, Shijie Li, Ming Li, Jinxiao Li, and Ke Ren. "Synthesis of garlic skin-derived 3D hierarchical porous carbon for high-performance supercapacitors." Nanoscale 10, no. 5 (2018): 2427–37. http://dx.doi.org/10.1039/c7nr07158b.

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Fałtynowicz, Hanna, Jan Kaczmarczyk, Rafał Łużny, et al. "Activated Carbons for Removing Ammonia from Piggery Vent Air: A Promising Tool for Mitigating the Environmental Impact of Large-Scale Pig Breeding." Sustainability 16, no. 14 (2024): 6122. http://dx.doi.org/10.3390/su16146122.

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Unsustainable pig breeding is a great threat to the environment. Ammonia is one of the main pollutants emitted in piggery vent air. This work is a comparative survey that presents the findings on the effectiveness of ammonia adsorption from air using various activated carbons (ACs). Detailed consideration is given to the effects of (i) type of raw material (wood char, wood pellet, and commercial lignite-based char), (ii) preparation method (CO2, steam, and KOH activation), and (iii) activation conditions (temperature and KOH/char ratio), on the porous structure of ACs and their ammonia sorptio

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Ozbay, Nurgul, and Adife Seyda Yargic. "Comparison of Surface and Structural Properties of Carbonaceous Materials Prepared by Chemical Activation of Tomato Paste Waste: The Effects of Activator Type and Impregnation Ratio." Journal of Applied Chemistry 2016 (November 22, 2016): 1–10. http://dx.doi.org/10.1155/2016/8236238.

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Activated carbons were prepared by carbonization of tomato paste processing industry waste at 500°C followed by chemical activation with KOH, K2CO3, and HCl in N2 atmosphere at low temperature (500°C). The effects of different activating agents and impregnation ratios (25, 50, and 100 wt.%) on the materials’ characteristics were examined. Precursor, carbonized tomato waste (CTW), and activated carbons were characterized by using ultimate and proximate analysis, thermogravimetric analysis (TG/DTG), Fourier transform-infrared (FT-IR) spectroscopy, X-ray fluorescence (XRF) spectroscopy, point of

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Denmark, Iris, Samantha Macchi, Fumiya Watanabe, Tito Viswanathan, and Noureen Siraj. "Effect of KOH on the Energy Storage Performance of Molasses-Based Phosphorus and Nitrogen Co-Doped Carbon." Electrochem 2, no. 1 (2021): 29–41. http://dx.doi.org/10.3390/electrochem2010003.

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In this study, we have evaluated the effect of potassium hydroxide (KOH) on the energy storage performance of metal-free carbon-based materials prepared from molasses. Molasses are a renewable-resource biomass and economical by-product of sugar refinement, used here as a carbon precursor. Two co-doped carbon materials using molasses were synthesized via a time and cost-efficient microwave carbonization process, with ammonium polyphosphate as a phosphorus and nitrogen doping agent. The phosphorus and nitrogen co-doped carbon (PNDC) samples were prepared in the presence and absence of a chemical

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Paputungan, Mardjan, Nita Suleman, and Yulia Rahman Yunus. "Adsorption Power of Activated Charcoal from Coconut Shells on Lead Metal (Pb) in Well Water." Jurnal Penelitian Pendidikan IPA 9, no. 11 (2023): 9270–77. http://dx.doi.org/10.29303/jppipa.v9i11.4387.

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This research aims to determine the results of the characterization and ability of activated charcoal (activated with KOH) to absorb lead metal (Pb). The procedure used is the process of carbonizing coconut shells in an airtight container at a temperature of 300ºC. Activation of coconut shell charcoal was carried out by immersing the charcoal powder in a KOH solution with variations of 1 M, 3 M, and 5 M. Characterization of activated charcoal powder was carried out on pore morphology using SEM-EDX, and XRD to identify the crystal phase, and AAS to determine the concentration lead metal (Pb). B

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Li, Tie-hu, Tian-jie Chang, Yong-bin Ji, and Da-wei Wang. "Preparation and activation mechanism of mesocarbon microbeads by KOH activation." Carbon 47, no. 6 (2009): 1616. http://dx.doi.org/10.1016/j.carbon.2008.12.019.

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Huang, Yuxiang, and Guangjie Zhao. "Preparation and characterization of activated carbon fibers from liquefied wood by KOH activation." Holzforschung 70, no. 3 (2016): 195–202. http://dx.doi.org/10.1515/hf-2015-0051.

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Abstract Activated carbon fibers (ACFs) have been prepared from liquefied wood (Wliq) by chemical activation with KOH, with a particular focus on the effect of KOH/fiber ratio in term of porous texture and surface chemistry. ACFs based on steam activation served as a blank for comparison. The properties of the ACFs were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), nitrogen adsorption/desorption, Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results show that the KOH-activated ACFs have rougher surfaces and more a

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Nuñez, David, Juan Barraza, Juan Guerrero, Luis Díaz, Ajay K. Dalai, and Venu Babu Borugadda. "Adsorption of Lufenuron 50-EC Pesticide from Aqueous Solution Using Oil Palm Shell-Derived Activated Carbon." Materials 17, no. 21 (2024): 5389. http://dx.doi.org/10.3390/ma17215389.

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The use of Lufenuron 50-EC pesticide in oil palm crops affects water quality and aquatic life. This study investigated the adsorption of Lufenuron 50-EC from an aqueous solution using activated carbon derived from oil palm shells (OPSs). Activated carbon (AC) was prepared through physical and chemical activation processes in carbon dioxide environments, using potassium hydroxide (KOH) as a chemical activating agent. The resulting AC was characterized using standard techniques. The most favorable operating parameters were physical activation at 900 °C for 2 h, achieving a BET surface area of 54

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Daniel Valdez, Gérson, Flávio Pinheiro Valois, Sammy Jonatan Bremer, et al. "Improving the Bio-Oil Quality of Residual Biomass Pyrolysis by Chemical Activation: Effect of Alkalis and Acid Pre-Treatment." Energies 16, no. 7 (2023): 3162. http://dx.doi.org/10.3390/en16073162.

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In this study, we investigated the acid (HCl) and alkali (KOH) chemical activation of açaí seeds (Euterpe Oleraceae, Mart.) pre-treatment before pyrolysis at temperatures of 350–450 °C in order to assess how reactions proceed when affected by temperature. Chemical composition of bio-oil and aqueous phase were determined by GC-MS and FT-IR. The bio-char is characterized by XRD. For the activation with KOH, the XRD analysis identified the presence of Kalicinite (KHCO3), the dominant crystalline phase in bio-char, while an amorphous phase was identified in bio-chars for the activation with HCl. T

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Abarca, Ralf Ruffel, Mark Daniel de Luna, Sudip Chakraborty, Stefano Curcio, and Sebastiano Candamano. "Utilization of response surface methodology in optimization of de-oiled olive pomace activated biochar production." E3S Web of Conferences 148 (2020): 02006. http://dx.doi.org/10.1051/e3sconf/202014802006.

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Olive activated biochar (OAB) was prepared from waste de-oiled olive pomace (sansa esausta, SE) through carbonization followed by combined KOH and thermal activation. The activation process was optimized using central composite design (CCD) with pyrolysis temperature, activation time and KOH to pyrolized SE mass ratio (KOH/PSE) as independent variables, and yield, methylene blue number (MBN) and iodine number (ID) as responses. Optimized OAB was subjected to fixed bed adsorption of 100 mg L−1 methylene blue dye. Numerical optimization resulted in optimum process setting of 362°C pyrolysis temp

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Luo, Yan, Kang Wang, and Ling Fei. "The effects of activation conditions on physical properties of activated carbon." BioResources 15, no. 4 (2020): 7640–47. http://dx.doi.org/10.15376/biores.15.4.7640-7647.

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Porous carbons with a high porosity were successfully produced from fast pyrolysis pine wood char via a thermochemical method in which KOH was used as chemical activator. The effects of various weight ratios of KOH to pyrolysis char (0.65:1, 0.7:1, 1.0:1, 1.35:1, and 1.7:1) on the physical properties of activated carbons were investigated. When the weight ratio of KOH to pyrolysis char was 1.35:1, the prepared activated carbon had the highest surface area of 1140 m2/g with a total pore volume of 0.71 cm3/g, a microporous surface area of 957 m2/g, and a microporous specific volume of 0.51 cm3/g

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Taurbekov, Azamat, Alisher Abdisattar, Meiram Atamanov, et al. "Biomass Derived High Porous Carbon via CO2 Activation for Supercapacitor Electrodes." Journal of Composites Science 7, no. 10 (2023): 444. http://dx.doi.org/10.3390/jcs7100444.

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In this study, we systematically study the efficient production method and electrochemical characteristics of activated carbons (AC) derived from rice husk (RH) and walnut shell (WS). In particular, the effectiveness of physical activation using carbon dioxide (CO2) was investigated and compared with the more common chemical activation method using potassium hydroxide (KOH). The results show that the KOH–activated samples have remarkable specific capacities, reaching 157.8 F g−1 for RH and 152 F g−1 for WS at 1 A g−1. However, the rate capability of AC obtained via KOH decreases significantly

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Wan Mahmood, Wan Norasiah, Rusnah Samsuddin, and Raja Razuan Raja Deris. "Chemical Activation of Durian Shell Activated Carbon: Effects of Activation Agents." Advanced Materials Research 1113 (July 2015): 242–47. http://dx.doi.org/10.4028/www.scientific.net/amr.1113.242.

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Selection of suitable activation agent is important in order to produce high surface area of activated carbon. The present study was undertaken to develop high surface area of durian shell activated carbon (DSAC) using different chemical activation agents which were potassium hydroxide (KOH) and phosphoric acid (H3PO4). Surface porosity and surface area were directly measured from scanning electron microscopy (SEM) and surface area analyzer, respectively. For the optimum condition, it showed that H3PO4 treated DSAC had the highest surface area which was 257.50 m2/g compared to KOH treated DSAC

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