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Enhancing the Pore Properties and Adsorption Performance of Cocoa Pod Husk (CPH)-Derived Biochars via Post-Acid Treatment

1
Graduate Institute of Bioresources, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
2
Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
3
Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan
4
Kaohsiung District Agricultural Research and Extension Station, Council of Agriculture, Pingtung 908, Taiwan
*
Author to whom correspondence should be addressed.
Processes 2020, 8(2), 144; https://doi.org/10.3390/pr8020144
Received: 31 December 2019 / Revised: 17 January 2020 / Accepted: 20 January 2020 / Published: 22 January 2020
(This article belongs to the Special Issue Carbonaceous Materials for CO2 Capture and Pollutants Removal)
In this work, the cocoa pod husk (CPH) was converted into biochar products at higher carbonization temperatures (i.e., 400–800 °C). The pore and chemical properties of the resulting biochars and its post-leaching biochars by acid washing, including specific surface area, total pore volume, pore size distribution, true density, and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and Fourier Transform infrared spectroscopy (FTIR) were studied. Based on the pore properties, pyrolysis temperature at around 800 °C seemed to have the most profound impact on the pore development for producing biochar, where its Brunauer–Emmet–Teller (BET) surface area is 101 m2/g. More noticeably, more pores in the CPH-based biochar could be significantly created during the acid-washing, resulting in an increase of BET surface area from 101 to 342 m2/g. According to the data on the EDS and FTIR, the resulting biochars seemed to have oxygen-containing functional groups on the surface. Furthermore, the methylene blue (MB) adsorption performance of the optimal biochar product with maximal BET surface area was tested to fit its kinetics by the pseudo-second order model, showing a strong interaction between the biochar adsorbent and the cationic adsorbate. View Full-Text
Keywords: cocoa pod husk; biochar; pore property; energy dispersive X-ray spectroscopy; Fourier Transform infrared spectroscopy; adsorption performance cocoa pod husk; biochar; pore property; energy dispersive X-ray spectroscopy; Fourier Transform infrared spectroscopy; adsorption performance
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Tsai, W.-T.; Hsu, C.-H.; Lin, Y.-Q.; Tsai, C.-H.; Chen, W.-S.; Chang, Y.-T. Enhancing the Pore Properties and Adsorption Performance of Cocoa Pod Husk (CPH)-Derived Biochars via Post-Acid Treatment. Processes 2020, 8, 144.

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