High-Performance Metal–Organic Framework-Templated Sorbent for Selective Eu(III) Capture
2020
A stable
porous sorbent M1 was achieved through the
specific transformation of flexible thioalkyl groups and metal cluster
sites in a zirconium MOF (metal–organic framework; Zr-L) template. The target polymer combines sulfoxide/sulfone
and phosphoric acid in a single framework, which was fully characterized
by 1H-NMR, PXRD, IR, and elemental analysis. When employed
as the heavy metal adsorbent, M1 exhibit a remarkable
Eu(III) sorption behavior, achieving both high chemical affinity (Kd = 105) and sorption capacity (the
maximum Eu(III) sorption capacity reached 220 mg g–1 at pH = 4.0 and T = 298 K calculated from the Langmuir
model). Recyclability and selectivity test of M1 further
prove that the sorbent is highly stable and effective for europium
enrichment in the aqueous solution. This work takes focus on the introduction
of multifunctional groups into a single polymeric framework in a feasible
and environmentally friendly way and highlights the sorption efficiency
for europium removal from the aqueous solution.
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