Characterization and methanol adsorption of walnut-shell activated carbon prepared by KOH activation

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• 作者：Qiongfen Yu 余琼簿/a> ; Ming Li 李明 ; Xu Ji ; Yu Qiu…
• 关键词：walnut ; shell activated carbon ; preparation conditions ; characterization ; methanol ; adsorption
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：31
• 期：2
• 页码：260-268
• 全文大小：1,088 KB
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• 作者单位：Qiongfen Yu 余琼粉 (1)
  Ming Li 李明 (1)
  Xu Ji (1)
  Yu Qiu (1)
  Yuntao Zhu (1)
  Congbin Leng (1)
  
  1. Solar Energy Research Institute, Yunnan Normal University, Kunming, 650500, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Chinese Library of Science
  
• 出版者：Wuhan University, co-published with Springer
• ISSN：1993-0437

文摘

Walnut-shell activated carbons (WSACs) were prepared by the KOH chemical activation. The effects of carbonization temperature, activation temperature, and ratio of KOH to chars on the pore development of WSACs were investigated. Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), and scanning electron microscopy (SEM) were employed to characterize the microstructure and morphology of WSACs. Methanol adsorption performance onto the optimal WSAC and the coal-based AC were also investigated. The results show that the optimal preparation conditions are a carbonization temperature of 700 °C, an activation temperature of 700 °C, and a mass ratio of 3. The BET surface area, the micropore volume, and the micropore volume percentage of the optimal WASC are 1636 m2/g, 0.641 cm3/g and 81.97%, respectively. There are a lot of micropores and a certain amount of meso- and macropores. The characteristics of the amorphous state are identified. The results show that the optimal WSAC is favorable for methanol adsorption. The equilibrium adsorption capacity of the optimal WSAC is 248.02mg/g. It is shown that the equilibrium adsorption capacity of the optimal WSAC is almost equivalent to that of the common activated carbon. Therefore the optimal WSAC could be a potential adsorbent for the solar energy adsorption refrigeration cycle.