Characterization, preparation, and reaction mechanism of hemp stem based activated carbon

Ji Zhang; Jianmin Gao; Yao Chen; Xinmin Hao; Xiaojuan Jin

Results in Physics (Jan 2017)

Characterization, preparation, and reaction mechanism of hemp stem based activated carbon

Ji Zhang,
Jianmin Gao,
Yao Chen,
Xinmin Hao,
Xiaojuan Jin

Affiliations

Ji Zhang: MOE 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
Jianmin Gao: MOE 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
Yao Chen: MOE 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.
Xinmin Hao: 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, China
Xiaojuan Jin: MOE 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

Journal volume & issue: Vol. 7
pp. 1628 – 1633

Abstract

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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

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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