Issue 11, 2025

Recyclable chloride trapping and sustained nicotinate release monitored by photoluminescence of Eu3+-doped layered yttrium hydroxide

Abstract

Nicotinic acid (NA; also known as niacin or vitamin B3), an essential nutrient for humans, was inserted into the interlayer spaces of Eu3+-doped layered yttrium hydroxide (LYH:Eu). This hybrid system, NA-LYH:Eu, demonstrated remarkable efficiency in the storage of NA, offering long-term stability, reusability, and controlled, sustained release capabilities. Notably, the intercalated NA sensitized the luminescence of Eu3+ ions via the transfer of UV-energy absorbed for its π → π* transition from the S0 ground state to the S1 excited state, leading to the characteristic 5D07FJ (J = 1–4) transitions. The resulting bright red emission could be reversibly quenched and restored through repeated NA release (chloride uptake) and re-inclusion cycles within the LYH:Eu interlayers, demonstrating the potential application as a chloride-induced corrosion inhibitor. The release rate of NA in a phosphate buffer solution could be modulated by tuning the crystallinity and particle size of the LYH:Eu host. When highly crystalline NA-LYH:Eu was employed, the in vitro release of NA continued beyond 5 days without reaching equilibrium. Concurrently, the red emission from a colloidal solution containing NA-LYH:Eu particles gradually diminished as the release progressed, providing a visually observable indicator. This luminescence ‘on/off’ behavior offers a practical method for in situ visual monitoring of NA inclusion and release.

Graphical abstract: Recyclable chloride trapping and sustained nicotinate release monitored by photoluminescence of Eu3+-doped layered yttrium hydroxide

Supplementary files

Article information

Article type
Paper
Submitted
26 Dec 2024
Accepted
28 Jan 2025
First published
29 Jan 2025
This article is Open Access
Creative Commons BY license

J. Mater. Chem. C, 2025,13, 5725-5732

Recyclable chloride trapping and sustained nicotinate release monitored by photoluminescence of Eu3+-doped layered yttrium hydroxide

Y. Choi, M. Kang and S. Byeon, J. Mater. Chem. C, 2025, 13, 5725 DOI: 10.1039/D4TC05448B

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