Journal
NANOMATERIALS
Volume 12, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/nano12060974
Keywords
recycling; silica nanoadsorbents; adsorption; REE; LTM; functional ligands
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Funding
- ERA-MIN 2 MetRecycle project - Research Council Vinnova [2018-00739]
- project Separation and recycling of rare earth elements, cobalt and nickel from magnets - AForsk foundation [21-75]
- Formas [2020-02321]
- Formas [2020-02321] Funding Source: Formas
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Novel silica-based adsorbents with amine and sulfur containing functional groups were synthesized. These adsorbents showed good adsorption and separation performance for Rare Earth Elements (REE) and Late Transition Metals (LTM). The adsorption equilibrium data fitted well to Langmuir isotherm model. The organo-silicas demonstrated higher affinity towards LTM and had adsorption capacities ranging from 0.5 to 1.8 mmol/g.
Novel silica-based adsorbents were synthesized by grafting the surface of SiO2 nanoparticles with amine and sulfur containing functional groups. Produced nanomaterials were characterized by SEM-EDS, AFM, FTIR, TGA and tested for adsorption and separation of Rare Earth Elements (REE) (Nd3+ and Sm3+) and Late Transition Metals (LTM) (Ni2+ and Co2+) in single and mixed solutions. The adsorption equilibrium data analyzed and fitted well to Langmuir isotherm model revealing monolayer adsorption process on homogeneously functionalized silica nanoparticles (NPs). All organo-silicas showed high adsorption capacities ranging between 0.5 and 1.8 mmol/g, depending on the function and the target metal ion. Most of these ligands demonstrated higher affinity towards LTM, related to the nature of the functional groups and their arrangement on the surface of nanoadsorbent.
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