Inorganic nanofiber as a promising sorbent for lithium recovery
- Title
- Inorganic nanofiber as a promising sorbent for lithium recovery
- Author
- 김현중
- Keywords
- Spinel lithium manganese oxide; Inorganic nanofiber; Reusability; Selectivity; Li+ adsorption; Li+ desorption
- Issue Date
- 2020-07
- Publisher
- ELSEVIER
- Citation
- SEPARATION AND PURIFICATION TECHNOLOGY, v. 242, article no. 116757
- 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.
- URI
- https://www.sciencedirect.com/science/article/pii/S1383586619357028?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/169528
- ISSN
- 1383-5866; 1873-3794
- DOI
- 10.1016/j.seppur.2020.116757
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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