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Pores on Pores: A novel approach to fabricate super adsorbents from used face masks for large CO2 capture and dye removal

Authors
Roy, SunandaGhosh, Barnali DasguptaGoh, Kheng LimKim, JaehwanAhn, Hyeok JunChang, Young-Wook
Issue Date
Mar-2023
Publisher
Pergamon Press Ltd.
Keywords
Waste; Activated carbon; Surface area; Porosity; Adsorbent; Dye; Desorption
Citation
Carbon, v.206, pp 422 - 433
Pages
12
Indexed
SCIE
SCOPUS
Journal Title
Carbon
Volume
206
Start Page
422
End Page
433
URI
https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/112555
DOI
10.1016/j.carbon.2023.02.040
ISSN
0008-6223
1873-3891
Abstract
Recently, a profound interest has been developed in preparing adsorbents (mostly carbon-based) for CO2 capture due to increasing global warming. Unfortunately, the adsorption capacity is still not satisfactory due to inadequate coordination between the surface pores and surface chemistry, the key players in adsorption. This article describes a new strategy to produce highly effective adsorbents, capable of absorbing a large CO2 from ambient conditions (35 degrees C, 1atm). The adsorbents were produced from used face masks (FMs), a highly produced medical waste in current times. The high adsorption capacity of the adsorbent was incorporated through a novel surface functionalization process that generates numerous additional hierarchical pores on the pre-designed porous adsorbents, and more effective chemical binding sites, prerequisites for heavy CO2 capture. Firstly, the FMs were converted into porous activated carbon fibers (ACFs) under controlled conditions and then modified the surface with polydopamine (pDA) assisted tetraethylenepentamine (TEPA) grafting. After modification, the adsorbent (TEPA-pDA-ACFs, 3.89 mmol/g) showed 648% and 24% higher CO2 adsorption capacity than that of the pristine FMs (0.52 mmol/g) and ACFs (3.14 mmol/g), respectively. The value was found superior to many recent reports based on carbon adsorbents. Moreover, the adsorbent displayed excellent regeneration (>98%) and recycling ability even after several cycles. Interestingly, the adsorbent further showed outstanding multi-dye removal capacities (both cationic and anionic) from aqueous solutions. The removal efficiency remained >94% even after 9 cycles of adsorption-desorption. These results conclude that our attempt for preparing adsorbents from used face masks (TEPA-pDA-ACFs) could be a robust and viable approach for the development of a sustainable earth.
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ERICA 공학대학 (DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING)
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