Hydrothermal synthesis of Eu-doped BaMoO fluorescent probe for the selective detection of Fe ions

• Published in: New journal of chemistry 2022-09, Vol.46 (35), p.16951-16958
• Main Authors: Wang, Dongmei, Liang, Yunhao, Wang, Zhiyi, Hu, Shanshan, Yang, Jun
• Format: Article
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d2nj02030k

Water-dispersible Eu 3+ -doped BaMoO 4 phosphors with a morphology of monodisperse uniform elongated octahedra are prepared using a hydrothermal method in this paper. The phosphors are used to detect Fe 3+ ions in aqueous solution because of the fluorescence quenching caused by the competitive adsorption between the Fe 3+ ions and Eu 3+ ions. A modified Stern-Volmer formula is used to describe the fluorescence quenching. The best fitting curve ( R 2 = 0.99104) and the smallest limit of detection (LOD = 0.12 μM) are obtained when the doping concentration of Eu 3+ is 1 mol%. Furthermore, various cations are added to the aqueous solution to verify the selective detection of Fe 3+ ions. Besides, it is interesting that the phosphor is renewable because the photoluminescence (PL) intensity can recover to 94% by adding NH 4 F to the aqueous solution after detecting Fe 3+ -ions. Finally, the Eu 3+ -doped BaMoO 4 phosphor is used to detect Fe 3+ in a lake water sample, and the calculated Fe 3+ concentration is 3.6 × 10 −4 mol L −1 (close to 4 × 10 −4 mol L −1 measured using ICP). Our investigation suggests that the Eu 3+ -doped BaMoO 4 phosphor is an efficient and renewable fluorescent probe for the selective detection of Fe 3+ . BaMoO 4 :Eu 3+ fluorescent probe materials have high selectivity and sensitivity for Fe 3+ -ion detection and can be applied to the detection of Fe 3+ in actual wastewater.