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- Title
Amidoxime Functionalization of Algal/Polyethyleneimine Beads for the Sorption of Sr(II) from Aqueous Solutions.
- Authors
Wei, Yuezhou; Salih, Khalid A. M.; Lu, Siming; Hamza, Mohammed F.; Fujita, Toyohisa; Vincent, Thierry; Guibal, Eric
- Abstract
There is a need for developing new sorbents that incorporate renewable resources for the treatment of metal-containing solutions. Algal-polyethyleneimine beads (APEI) (reinforced with alginate) are functionalized by grafting amidoxime groups (AO-APEI). Physicochemical characteristics of the new material are characterized using FTIR, XPS, TGA, SEM, SEM-EDX, and BET. AO-APEI beads are tested for the recovery of Sr(II) from synthetic solutions after pH optimization (≈ pH 6). Uptake kinetics is fast (equilibrium ≈ 60–90 min). Sorption isotherm (fitted by the Langmuir equation) shows remarkable sorption capacity (≈ 189 mg Sr g−1). Sr(II) is desorbed using 0.2 M HCl/0.5 M CaCl2 solution; sorbent recycling over five cycles shows high stability in terms of sorption/desorption performances. The presence of competitor cations is studied in relation to the pH; the selectivity for Sr(II) is correlated to the softness parameter. Finally, the recovery of Sr(II) is carried out in complex solutions (seawater samples): AO-APEI is remarkably selective over highly concentrated metal cations such as Na(I), K(I), Mg(II), and Ca(II), with weaker selectivity over B(I) and As(V). AO-APEI appears to be a promising material for selective recovery of strontium from complex solutions (including seawater).
- Subjects
AQUEOUS solutions; POLYETHYLENEIMINE; SORPTION; DISTRIBUTION isotherms (Chromatography); LANGMUIR isotherms; BORON isotopes; STRONTIUM; ALKALINE earth metals
- Publication
Molecules, 2019, Vol 24, Issue 21, p3893
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules24213893