Abstract

Aims: By using terephthalic acid, 2, 5-furandicarboxylic acid, and terbium nitrate hexahydrate, a Tb-MOF with a core-shell structure was successfully designed and prepared.

Method: A one-pot method was employed to design and synthesize core-shell Tb-MOF. The morphology, luminescence performance, and stability were well characterized.

Results: Tb-MOF demonstrated good water stability, acid and alkali resistance, and thermal stability. Tb-MOF was found to have high sensitivity to detect Cr³⁺, Bi³⁺, and acetone in an aqueous solution, and the LOD of Cr³⁺, Bi³⁺, and acetone were calculated to be 0.18 μM, 4.22 μM, and 0.26%, respectively. The sensing mechanism of Cr³⁺ and acetone was explained as energy-competitive absorption, and the sensing mechanism of Bi³⁺ was explained as ion replacement.

Conclusion: The prepared Tb-MOF can be developed as a multifunctional light-emitting sensor with high selectivity.

Keywords: Cr³⁺, Bi³⁺, acetone, Tb-MOF, luminescence quenching, metal-organic frameworks, core-shell.