Janus multi-responsive superparamagnetic nanoparticles functionalized with two on-demand and independently cleavable...

Area of Science:

• Materials Science
• Environmental Chemistry
• Nuclear Chemistry

Background:

• Stimuli-responsive nanoparticles with remotely detachable ligands are of growing interest.
• Multi-responsive systems are crucial for environmental and biomedical applications.
• Developing nanoparticles with dual, independently cleavable ligands is a key research focus.

Purpose of the Study:

• To investigate the covalent coupling of two distinct ligands onto a single nanoparticle, enabling independent release.
• To explore the application of dual on-demand cleavable ligand-functionalized nanoparticles for groundwater decontamination and radionuclide separation.
• To achieve efficient, single-step separation of contaminants, thereby simplifying processes and minimizing secondary waste.

Main Methods:

• Functionalization of sub-10 nm Janus superparamagnetic nanoparticles using click-chemistry (thiol and Diels-Alder) with two Actinide-specific chelators.
• Independent detachment of chelators via pH- or thermo-stimulation, utilizing reversible covalent bonds.
• Incubation of nanoparticles with diethylenetriamine-pentaacetic acid (DTPA) and [(2-furan-2-yl-2-hydroxy-ethylcarbamoyl)-methoxy]-acetic acid (FHECMAA) with UO2^2+ and La^3+ at varying pH levels, followed by metal content measurement.

Main Results:

• Demonstrated perfect selectivity in chelator detachment from Janus nanoparticles.
• Achieved high efficiency in metal extraction, particularly in acidic media.
• Showcased good performance in separating uranium (U) and lanthanum (La) at neutral pH.

Conclusions:

• Janus nanoparticles functionalized with dual on-demand cleavable ligands provide a selective and efficient platform for metal separation.
• This technology holds significant promise for environmental remediation, particularly in groundwater decontamination and radionuclide separation.
• The independent release mechanism simplifies separation processes and contributes to waste reduction in the nuclear industry.