期刊
ULTRASONICS SONOCHEMISTRY
卷 72, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2021.105461
关键词
Metal-organic framework; MAMS-1; Deep eutectic solvent; Exfoliation; Eu-doped MOF; Sensing
资金
- National Natural Science Foundation of China [21803025]
- Jiangsu Provincial Natural Science Foundation of China [BK 2180583]
- Fundamental Research Funds for the Central Universities [JUSRP11711]
A sustainable and efficient method using deep eutectic solvent was developed for the exfoliation of layered-MOF into stable nanosheets. These nanosheets were then utilized to encapsulate Eu3+ cations, forming a multi-responsive luminescent sensor that can specifically recognize various ions with greatly improved sensitivity compared to bulk material.
The exfoliation of bulk two-dimensional metal-organic framework (MOF) into few-layered nanosheets has attracted much attention recently. In this work, an environmental-friendly route has been developed for layered-MOF (MAMS-1) delamination using deep eutectic solvent (DES), which is more sustainable and efficient alternative than conventional organic solvents for MOF nanosheet preparation. Under sonication condition, DES as solvents, the highest exfoliation rate of MAMS-1 is up to 70% with two host layers via poly(vinylpyrrolidone) (PVP) surfactant-assisted method. The presence of tert-butyl exteriors and the atomically thickness endow the MOF nanosheets stable suspension for at least one month. Due to the 2D structure and excellent stability, MAMS-1 nanosheet (MAMS-1-NS) was chosen as a good candidate to encapsulate Eu3+ cations. The obtained Eu3+@MAMS-1-NS acts as a multi-responsive luminescent sensor through fluorescence quenching, and can specifically recognize Fe3+ (LOD = 0.40 mu M, K-SV = 1.05 x 10(5) M-1), Hg2+ (LOD = 0.038 mu M, K-SV = 5.78 x 10(6) M-1), Cr2O72- (LOD = 0.33 mu M, K-SV = 1.55 x 10(5) M-1) and MnO4- (LOD = 0.088 mu M, K-SV = 4.49 x 10(5) m(-1)). Compared with bulk Eu3+@MAMS-1, the sensitivity of Eu3+@MAMS-1-NS is greatly improved owing to its ultrathin nanosheet morphology and highly accessible active sites on the surface.
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