Amidoxime Functionalization of Algal/Polyethyleneimine Beads for the Sorption of Sr(II) from Aqueous Solutions.

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

SUBMITTER: Wei Y 

PROVIDER: S-EPMC6864727 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature