期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 233, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2019.116059
关键词
Polystyrene, rare-earth elements; Diglycolic acid; Adsorption; Nanofiber, selectivity
资金
- Environmental and Nano Sciences Research Group, University of the Western Cape, South Africa
- Water Research Commission, South Africa [WRC K5//2391]
- Research Foundation of the Lappeenranta University of Technology
- Academy of Finland
- Finnish Cultural Foundation/South Karelia Regional fund
- Magnus Ehrnrooth Foundation
Highly selective and stable ligands with fast kinetics for rare earth element extraction are not well developed. Durable attachment of ligands to the support would make regeneration possible. Polystyrene nanofiber supports (PS-nF) were prepared using the electrospinning method. Thereafter, PS-nf were chemically modified with diglycolic anhydride (DGA) to produce novel electrospun polystyrene diglycolic acid nanofiber (PS-DGAnf) adsorbents. The immobilisation reaction proceeded via an electrophilic aromatic substitution of the ligand onto the PS nanofiber. The maximum gravimetric loading of DGA on PS nanofiber was 0.827 g g(-1). The unmodified and modified nanofibers were characterised by ATR-FTIR, HR-SEM, BET and TGA. After optimising pH, time and concentration, the equilibrium adsorption and binding kinetics of cerium (Ce3+) and neodymium (Nd3+) ions on the nanofibers surface were examined at pH 6. The adsorption capacity of PS-DGAnf for Ce3+ and Nd3+ at pH 6.0 was 152.5 mg g(-1) (1.09 mmol/g) and 146.2 mg g(-1) (1.01 mmol/g) respectively. Selectivity of Ce3+ over Ni-2(+), Co2+ and Sr3+ was also studied at pH 6. The amount of Ce3+ adsorbed even in the presence of interfering ions was 100.3 mg g(-1), which was only a little lower than 119.4 mg g(-1) obtained in a single ion solution. The rapid adsorption kinetics of Ce3+ and Nd3+ ions were achieved within 15 mins. The desorption and regeneration was carried out with 1 M nitric acid and the developed PS-DGAnf adsorbent could be reused for 4 cycles without any substantial loss to its adsorption abilities.
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