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

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Abstract

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.

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Authors and Affiliations

  1. Solar Energy Research Institute, Yunnan Normal University, Kunming, 650500, China

    Qiongfen Yu  (余琼粉), Ming Li  (李明), Xu Ji, Yu Qiu, Yuntao Zhu & Congbin Leng

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  1. Qiongfen Yu  (余琼粉)
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  2. Ming Li  (李明)
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  3. Xu Ji
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  4. Yu Qiu
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  5. Yuntao Zhu
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  6. Congbin Leng
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Corresponding author

Correspondence to Ming Li  (李明).

Additional information

Funded by the National Natural Science Foundation of China (Nos. U1137605, 51366014, 51466017, and 51566017), the General Program of Yunnan Provincial Applied Fundamental Research (No. 2011FZ076), and the Scientific Research Training Foundation of Undergraduate (No. ky2014-179)

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Yu, Q., Li, M., Ji, X. et al. Characterization and methanol adsorption of walnut-shell activated carbon prepared by KOH activation. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 260–268 (2016). https://doi.org/10.1007/s11595-016-1362-3

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  • DOI: https://doi.org/10.1007/s11595-016-1362-3

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