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Issue 33, 2019
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A Eu-MOF/EDTA-NiAl-CLDH fluorescent micromotor for sensing and removal of Fe3+ from water

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Abstract

This paper reports a novel bioinspired Pt-free three-dimensional (3D) EDTA (Ethylene Diamine Tetraacetic Acid)-functionalized Eu-MOF (Metal Organic Framework)-based fluorescent micromotor as an active self-propelled micromachine for detection, capturing, and removal of Fe3+ from water. This micromotor was composed of EDTA-NiAl-CLDHs (calcined layered double hydroxides)/MnO2 and a Eu-MOF, with each component functioning differently. The outer fluorescent Eu-MOF layer acted as a fluorescent sensor for detecting Fe3+, while the inner EDTA-functionalized NiAl-CLDH/MnO2 layer functioned as a functional unit for Fe3+ adsorption, as well as the buffer layer for the nucleation and growth of the Eu-MOF. MnO2 served as a catalyst in decomposing H2O2 for self-propulsion of the micromotor. The obtained micromotor exhibited a circle motion form with an average speed of 56.9 μm s−1 in 5 wt% H2O2. This EDTA-functionalized Eu-MOF-based fluorescent micromotor showed excellent selectivity, high sensitivity (Stern–Volmer constant Ksv = 1.3 × 104 L mol−1, and limit of detection LOD = 0.15 μM) and high adsorption capacity (the maximum equilibrium adsorption capacity qmax = 112 mg g−1) for Fe3+. Therefore, the novel 3D bifunctional fluorescent micromotor combining the MOF, EDTA-functionalized CLDHs and autonomous motion is promising for the simultaneous detection/adsorption and removal of pollutants, expanding the potential resources for micromotors and providing an efficient option for water quality monitoring and wastewater treatment.

Graphical abstract: A Eu-MOF/EDTA-NiAl-CLDH fluorescent micromotor for sensing and removal of Fe3+ from water

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Publication details

The article was received on 21 Jun 2019, accepted on 31 Jul 2019 and first published on 01 Aug 2019


Article type: Paper
DOI: 10.1039/C9TC03328A
J. Mater. Chem. C, 2019,7, 10297-10308

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    A Eu-MOF/EDTA-NiAl-CLDH fluorescent micromotor for sensing and removal of Fe3+ from water

    W. Yang, J. Li, Z. Xu, J. Yang, Y. Liu and L. Liu, J. Mater. Chem. C, 2019, 7, 10297
    DOI: 10.1039/C9TC03328A

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