Fabrication of a porous polyacrylonitrile nanofiber adsorbent for removing radioactive Co-60
- Authors
- Pak, Geun Tae; Jo, Seonyoung; Kim, Tae Hyun; Lee, Keun-Woo; Huh, Tae-Hwan; Kwark, Young-Je; Yang, Hee-Man; Lee, Taek Seung
- Issue Date
- Sep-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Porous polyacrylonitrile nanofibers; Electrospinning; Radioactive Co-60 adsorbent; Ethylenediaminetetraacetic acid; Polyethyleneimine
- Citation
- CHEMOSPHERE, v.302
- Journal Title
- CHEMOSPHERE
- Volume
- 302
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/43577
- DOI
- 10.1016/j.chemosphere.2022.134910
- ISSN
- 0045-6535
- Abstract
- A Co2+ adsorbent was prepared using electrospun porous polyacrylonitrile (PAN) nanofibers, featuring easy recovery for reuse compared with a nanoparticle-based adsorbent. As an efficient ligand for Co2+, ethylenediaminetetraacetic acid (EDTA) was introduced on the surface of porous PAN nanofibers with the aid of a branched polyethyleneimine (PEI) linker to obtain an adsorbent with carboxylic acid groups. On the adsorbent surface, the carboxylic acid and amine groups from EDTA could adsorb Co2+ via ion exchange and chelation, and amine groups from PEI that remained after EDTA functionalization played a role in coordinating Co2+. The amine and carboxylic acid groups were simultaneously involved in the adsorption on the surface, making it possible to remove Co2+ over a wide pH range. An investigation of the adsorption isotherms and kinetics of the nanofibrous adsorbent indicated that monolayer chemisorption was achieved with a maximum Co2+ adsorption capacity of 8.32 mg/g. In addition, radioactive Co-60 was efficiently removed by the adsorbent with a removal extent of more than 98%. Considering the easy separation from Co2+ solution and regeneration of the nanofibrous adsorbent and its availability in a wide pH range, the adsorbent has great advantages in practical applications.
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