Carbon quantum dots activated metal organic frameworks for selective detection of Cu(Ⅱ) and Fe(Ⅲ)
2020
Fan, Lu | Wang, Yingxi | Li, Ling | Zhou, Jianggang
In this study, 2-amino-terephthalic acid was designed for construction of MOFs, and carbon quantum dots (CQDs) were designed to activate the Metal Organic Frameworks (MOFs) to be used as fluorescent sensor for selectively detection for Fe³⁺ and Cu²⁺, enhancing the fluorescence to an “on” state by the hybrid with CQDs in the MOFs as activating agent; quenching the fluorescence to an “off” state by removal of CQDs through the metal competitive coordination substitution strategy. Using this strategy, the prepared CQDs/MOFs material can be used as a fluorescence “on-off” probe for highly sensitive detection of Fe³⁺ and Cu²⁺ in aqueous solution. It was found that the LOD of CQDs/MOFs for sensing Fe³⁺ and Cu²⁺ were 2.3 ppb and 1.3 ppb, respectively. It was proved that the CQDs/MOFs has little cytotoxicity to 4T-1 cells, indicating the potential application in the detection for Fe³⁺ and Cu²⁺ ions in cells.
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