Inorganic nanofiber as a promising sorbent for lithium recovery
- Authors
- Choi, Sowon; Hwang, Gukhwa; Ilyas, Sadia; Han, Yosep; Myung, Nosang, V; Lee, Byoung-cheun; Song, Youngsoo; Kim, Hyunjung
- Issue Date
- Jul-2020
- Publisher
- ELSEVIER
- Keywords
- Spinel lithium manganese oxide; Inorganic nanofiber; Reusability; Selectivity; Li+ adsorption; Li+ desorption
- Citation
- SEPARATION AND PURIFICATION TECHNOLOGY, v.242, pp.1 - 10
- Indexed
- SCIE
SCOPUS
- Journal Title
- SEPARATION AND PURIFICATION TECHNOLOGY
- Volume
- 242
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/187369
- DOI
- 10.1016/j.seppur.2020.116757
- ISSN
- 1383-5866
- Abstract
- Lithium recovery by adsorption from aqueous resources is promising with respect to securing finite mineral resources. In this study, an inorganic spinel lithium manganese oxide (LiMn2O4) nanofiber with a tunable diameter was fabricated by electrospinning. Spinel hydrous manganese oxide, which has high lithium selectivity, was derived from LiMn2O4 by Li+-H+ exchange. The kinetic and isotherm studies with respect to Li+ adsorption revealed that the nanofibers fitted well to the second-order kinetic model and the Langmuir adsorption model; moreover, adsorption capacity increased as diameter decreased. The relationship between Li+ adsorption and diameter was explained according to the Brunauer-Emmett-Teller (BET) surface area: Adsorption capacity increases with an increase in BET surface area. Notably, the nanofibers performed better than the particles with the same chemical composition as that of the nanofibers; this trend was attributed to the aggregation of the particles, which caused the number of sorption sites to decrease. The reusability of the nanofiber was assessed through adsorption-desorption cycle tests. The adsorption capacity of the nanofiber with a diameter of 45 nm, which was the smallest diameter, was largely reduced after the five-cycle process; moreover, the capacity only reached 61% of the initial capacity at the fifth cycle, while the other nanofibers and the particle maintained capacities of over 90% at the fifth cycle. This reduction in Li+ adsorption was due to the significant detriment of the fibrous structure during the adsorption-desorption process. The nanofiber with a diameter of 90 nm was optimal in terms of adsorption capacity and reusability. Furthermore, the Li+ selectivity test conducted in artificial sea water showed that Li+ selectivity was the greatest among other cations.
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