A novel magnetic biochar from spent shiitake substrate: characterization and analysis of pyrolysis process

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• 作者：Yuhui Ma ; Qunhui Wang ; Xiaohong Sun ; Xiaoqiang Wang
• 关键词：Magnetic biochar ; Spent shiitake substrate ; Characterization ; Pyrolysis study
• 刊名：Biomass Conversion and Biorefinery
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：5
• 期：4
• 页码：339-346
• 全文大小：1,618 KB
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• 作者单位：Yuhui Ma (1)
  Qunhui Wang (1)
  Xiaohong Sun (2)
  Xiaoqiang Wang (3)
  
  1. Department of Civil and Environment Engineering, University of Science and Technology Beijing, Beijing, 100083, China
  2. Beijing Agricultural Biotechnology Centre, Beijing Academy of Agriculture and Forestry, Beijing, 100083, China
  3. National Engineering Laboratory for Biomass Power Generation Equipment, School of Renewable Energy, North China Electric Power University, Beijing, 102206, China
  
• 刊物类别：Engineering
• 刊物主题：Biotechnology
  Renewable and Green Energy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：2190-6823

文摘

A novel magnetic biochar was obtained via pyrolysis of Fe(NO₃)₃-impregnated spent shiitake substrate (SSS). The product was characterized by X-ray diffraction (XRD), vibrating sample magnetometer (VSM), N₂-adsorption, scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX) analysis. The pyrolysis process was investigated by thermogravimetric analysis (TGA) and XRD, and the pyrolysis kinetic was analyzed via Coats-Redfern method. Experimental results demonstrated that the magnetic FeO·Fe₂O₃ crystals and porous char structure were effectively formed via pyrolysis, and the magnetic biochar had a saturation magnetization value of 20.83 emu/g. The product had a surface area of 177 m2/g and a total pore volume of 0.188 cm3/g, respectively, and it consisted basically of micropores with diameter of 1.5 nm and mesopores with diameter between 2 and 10 nm. Moreover, Fe can decrease the thermal stability of SSS, and the magnetic crystals were mainly formed between the temperature region of 420 and 530 °C. In addition, the activation energy needed to break down the structure of SSS was lowered by 12.12 kJ/mol with the presence of Fe. Keywords Magnetic biochar Spent shiitake substrate Characterization Pyrolysis study