Characterization, preparation, and reaction mechanism of hemp stem based activated carbon
In this study, hemp stem was used to prepare high surface area activated carbon (AC) by KOH activation. The structure, characterization, thermal and structure analysis on reaction mechanisms of AC were investigated via N2 adsorption–desorption isotherm, Fourier transform infrared (FTIR) spectroscopy...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2017-01-01
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| Series: | Results in Physics |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379717303832 |
| _version_ | 1819035290582384640 |
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| author | Ji Zhang Jianmin Gao Yao Chen Xinmin Hao Xiaojuan Jin |
| author_facet | Ji Zhang Jianmin Gao Yao Chen Xinmin Hao Xiaojuan Jin |
| author_sort | Ji Zhang |
| collection | DOAJ |
| description | In this study, hemp stem was used to prepare high surface area activated carbon (AC) by KOH activation. The structure, characterization, thermal and structure analysis on reaction mechanisms of AC were investigated via N2 adsorption–desorption isotherm, Fourier transform infrared (FTIR) spectroscopy and thermogravimetric-mass (TG-MS) spectrometry. Results show that when the impregnation ratio is 4.5:1 (KOH/char), the activation temperature is 800 °C, and the activation time is 1.5 h, AC has the highest specific surface area of 2388 m2·g−1 and exhibits narrow pore size distributions with maxima in the micropore areas. The reaction mechanism of AC from hemp stems by KOH activation is as follows: In the first carbonization stage, it is primarily because of the substitution, scission, and oxidization reactions of methylene. Then in the second activation stage, it is mainly related to polycyclic reactions, reactions between carbon and KOH, and reactions between intermediate potassium oxide species and carbon. Keywords: Hemp stem, Activated carbon, Characterization, Reaction mechanism |
| first_indexed | 2024-12-21T07:47:17Z |
| format | Article |
| id | doaj.art-fce101c84a8446ae816b619b9d43e442 |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-12-21T07:47:17Z |
| publishDate | 2017-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-fce101c84a8446ae816b619b9d43e4422022-12-21T19:11:10ZengElsevierResults in Physics2211-37972017-01-01716281633Characterization, preparation, and reaction mechanism of hemp stem based activated carbonJi Zhang0Jianmin Gao1Yao Chen2Xinmin Hao3Xiaojuan Jin4MOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Lignocellulosic Chemistry, MOE Engineering Research Centre of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, 35 Qinghua East Road, Haidian, 100083 Beijing, ChinaMOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Lignocellulosic Chemistry, MOE Engineering Research Centre of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, 35 Qinghua East Road, Haidian, 100083 Beijing, ChinaMOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Lignocellulosic Chemistry, MOE Engineering Research Centre of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, 35 Qinghua East Road, Haidian, 100083 Beijing, China; Corresponding author.The Research Center of China-hemp Materials, The Quartermaster Research Institute of the General Logistics Department of the PLA, 28 Xizhimen North Street, 100088 Beijing, ChinaMOE Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Lignocellulosic Chemistry, MOE Engineering Research Centre of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, 35 Qinghua East Road, Haidian, 100083 Beijing, ChinaIn this study, hemp stem was used to prepare high surface area activated carbon (AC) by KOH activation. The structure, characterization, thermal and structure analysis on reaction mechanisms of AC were investigated via N2 adsorption–desorption isotherm, Fourier transform infrared (FTIR) spectroscopy and thermogravimetric-mass (TG-MS) spectrometry. Results show that when the impregnation ratio is 4.5:1 (KOH/char), the activation temperature is 800 °C, and the activation time is 1.5 h, AC has the highest specific surface area of 2388 m2·g−1 and exhibits narrow pore size distributions with maxima in the micropore areas. The reaction mechanism of AC from hemp stems by KOH activation is as follows: In the first carbonization stage, it is primarily because of the substitution, scission, and oxidization reactions of methylene. Then in the second activation stage, it is mainly related to polycyclic reactions, reactions between carbon and KOH, and reactions between intermediate potassium oxide species and carbon. Keywords: Hemp stem, Activated carbon, Characterization, Reaction mechanismhttp://www.sciencedirect.com/science/article/pii/S2211379717303832 |
| spellingShingle | Ji Zhang Jianmin Gao Yao Chen Xinmin Hao Xiaojuan Jin Characterization, preparation, and reaction mechanism of hemp stem based activated carbon Results in Physics |
| title | Characterization, preparation, and reaction mechanism of hemp stem based activated carbon |
| title_full | Characterization, preparation, and reaction mechanism of hemp stem based activated carbon |
| title_fullStr | Characterization, preparation, and reaction mechanism of hemp stem based activated carbon |
| title_full_unstemmed | Characterization, preparation, and reaction mechanism of hemp stem based activated carbon |
| title_short | Characterization, preparation, and reaction mechanism of hemp stem based activated carbon |
| title_sort | characterization preparation and reaction mechanism of hemp stem based activated carbon |
| url | http://www.sciencedirect.com/science/article/pii/S2211379717303832 |
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