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Title	Cold plasma-assisted regeneration of biochar for dye adsorption
ID_Doc	29682
Authors	Kandel, DR; Kim, HJ; Lim, JM; Poudel, MB; Cho, M; Kim, HW; Oh, BT; Nah, C; Lee, SH; Dahal, B; Lee, J
Title	Cold plasma-assisted regeneration of biochar for dye adsorption
Year	2022
Published
Abstract	Environmental remedies, including adsorption-based water purification, are now being asked to meet the requirement for a low-carbon circular economy requiring low energy and low material consumption. In this regard, we tested the possibility of regenerating adsorbents via cold plasma (CP) treatment for less use of ad-sorbents and no washing solution. In the adsorption of methylene blue (MB) using carbonized rice husk (CRH) and five successive regeneration cycles by CP treatment, the removal efficiencies were maintained at a moderate level (similar to 70% of the initial performance), unlike five consecutive adsorption without CP treatment (similar to 9???13% of the initial performance). The regeneration of CRH by CP treatment was also double-checked by the FESEM, EDS, BET, FTIR, XPS, and surface zeta potential measurements. The successfully recovered adsorption capability is related to the remediation of adsorption sites. It is also worth noting that the required power consumption for recycling by CP treatment was about 6.4 times lower than carbonizing new rice husks. This work provides in-sights into recovering adsorbents using CP without rigorous, costly, and energy-intensive processes.
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