Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 6, Issue 5, Pages 6889-6900Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.8b00725
Keywords
Rare earth elements; Chelation ion chromatography; Separation; Diethylenetriaminepentaacetic acid; Hybrid nanoadsorbent
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Funding
- Swedish Foundation for Strategic Research (SSF) [IRT 11-0026]
- FP-7 EU Program [309373]
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Silica nanoparticles and porous micropartides have been successfully functionalized with a monolayer of DTPA-derived ligands. The ligand grafting is chemically robust and does not appreciably influence the morphology or the structure of the material. The produced particles exhibit quick kinetics and high capacity for REE adsorption. The feasibility of using the DTPA-functionalized microparticles for chromatographic separation of rare earth elements has been investigated for different sample concentrations, elution modes, eluent concentrations, eluent flow rates, and column temperatures. Good separation of the La(III), Ce(III), Pr(III), Nd(III), and Dy(III) ions was achieved using HNO3 as eluent using a linear concentration gradient from 0 to 0.15 M over 55 min. The long-term performance of the functionalized column has been verified, with very little deterioration recorded over more than 50 experiments. The results of this study demonstrate the potential for using DTPA-functionalized silica particles in a chromatographic process for separating these valuable elements from waste sources, as an environmentally preferable alternative to standard solvent-intensive processes.
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