Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 302, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2021.122416
Keywords
Cadmium-organic framework; Fluorescent detection and reduction; Pb(II) and Cr(VI); Recyclable; Sensing and reducing mechanism
Funding
- National Natural Science Foundation of China [22078253]
- Xi'an Science and Technology Project of China [2019217114GXRC007CG008-GXYD7.1]
- Graduate Scientific Innovation Fund for Xi'an Polytechnic University [chx2021021]
- Shaanxi Provincial Education Department Service Local Special Project [19JC016]
- Science and Technology Project of Beilin District in Xi'an [GX2003]
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In this study, a novel Cd(II)-MOF was synthesized for rapid detection and effective removal of lead and chromium ions in water. The compound exhibited durable blue fluorescence and had ultra low detection limits for Pb2+, Cr2O72-, and CrO42-. Additionally, it could efficiently reduce Cr(VI) to Cr(III) ions under the irradiation of a mercury lamp, with reliable recycling ability.
Lead and chromate/dichromate are widely used in manufacturing industry, but Pb(II) and Cr(VI) ions pose fatal threats to human health and the water ecological environment. It is thus highly desirable to develop novel and valid strategies for rapid detection and effective decontamination of these heavy metal ions. Design and assembly of luminescent Metal-Organic Framework (LMOFs) for effective recognition and removal of Pb(II) and/or Cr(VI) from water provide a feasible avenue to address this issue. Herein, a novel Cd(II)-MOF, [(Cd3L2)]center dot(solvent)(x) (labeled as compound 1) with bright blue fluorescence was assembled under the solvothermal reaction of triangular ligand 5'-(5-carboxy-1H-benzo [d]imidazole-2-yl)-[1,1':3',1 ''-terphenyl]-4,4 ''-dicarboxylic acid (H3L) and Cd(NO3)(2). Given that the unique structure features of 3D stacking framework, i. e. strong pi center dot center dot center dot pi conjugative effects of organic linkers, plentiful free imidazole N atoms and carboxyl O atoms, Cd-MOF of 1 was deliberately deployed as bifunctional platform to sense Pb(II)/Cr(VI) and photochemically reduce Cr(VI) to Cr(III). Notably, 1 emits durable bright blue fluorescence and performs rapid quenching sense for Pb2+, Cr2O72- and CrO42-, with ultra low detection limits of 1.89, 4.83 and 2.84 ppb, respectively. Moreover, highly toxic Cr(VI) could be rapidly and thoroughly reduced to Cr(III) ions by 1 under the irradiation of mercury lamp, with reliable recycling ability. The possible photoluminescence, quenching and photocatalytic reduction mechanisms also were tentatively proposed.
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