Study on the reaction mechanism of the potassium bicarbonate alkali activation process in black liquor

초록

The alkaline hydrothermal separation of cellulose is a crucial step in biofuel generation, wherein black liquor containing lignin and alkali is produced as a by-product. This study explored the reaction mechanism of the residual alkali during the activation process. In this reaction, the impregnated K reagent exhibited unusual behavior owing to its bonding with the lignin structure, which was confirmed by the K 2p peak shift in x-ray photoelectron spectra. This behavior resulted in the formation of a microporous and mesoporous substance with a high surface area of 2146 m(2) g(-1) without requiring additional chemical reagents. Furthermore, the activated carbon derived from black liquor possessed outstanding properties, allowing its use in supercapacitors. This study demonstrates that giant miscanthus-derived black liquor can be used as an activated carbon precursor for application in electric double-layer capacitors owing to its superior electrochemical capabilities. (C) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(http://creativecommons.org/licenses/by/4.0/).

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