Separating Methyl Blue Selectively from the Mixture of Dyes by Europium Metal-organic Frameworks

doi:10.7503/cjcu20210715

Abstract

Abstract:

Although Eu-based metal-organic frameworks as fluorescence sensors have been reported widely， they are rarely used to separate dyes selectively owing to the lack of water stability. Herein， we choose a reported Eu-MOF to separate MB（methylene blue） selectively from mixed dyes aqueous by ion exchanges between the cations in the pore channels of the Eu-MOF and MB. The results show that MB can be separated selectively and quickly from the mixture of dyes. Meanwhile， the Eu-MOF not only has the relatedly high absorbing capacity of ca. 20 mg/g in aqueous solution at room temperature， but also can be recycled for 3 times at least. Moreover， the mechanism of highly selective absorption was also discussed， and as a consequence， the charge interaction and size exclusion play a key role in the absorption progress.

Key words: Eu-based metal-organic framework, Methyl blue, Selective separation

CLC Number:

O614.33

TrendMD:

LIU Xueguang, YANG Xiaoshan, MA Jingjing, LIU Weisheng. Separating Methyl Blue Selectively from the Mixture of Dyes by Europium Metal-organic Frameworks[J]. Chem. J. Chinese Universities, 2022, 43(1): 20210715.

Figures/Tables 15

Fig.1 3D framework with large channels along the three axes(A) Along the c?axis; (B) along the b?axis; (C) along the a?axis. For clarity, all hydrogen atoms were omitted.

Fig.2 Structures(up) and dimensions(down) of organic dyes with different charges and sizes

Fig.3 Adsorption effect of different amounts of Eu?MOFs in MB aqueous solution(20 mg/L)(A) UV?Vis spectra; (B) related photographs.

Fig.4 Adsorption effect of different amounts of Eu?MOF in Rh6G aqueous solution(20 mg/L)(A) UV?Vis spectra; (B) related photographs.

Fig.5 Adsorption effect of different amounts of Eu?MOFs in MO aqueous solution(20 mg/L)(A) UV?Vis spectra; (B) related photographs.

Fig.6 Adsorption effect of different amounts of Eu?MOFs in XO aqueous solution(20 mg/L)（A） UV?Vis spectra；（B） related photographs.

Fig.7 UV?Vis spectra of aqueous solutions of MB with different concentrations(A) and adsorption intensity(black dots) of MB dyes at different concentrations(B)Red solid line is the best linear fit.

Fig.8 UV?Vis absorbance spectrum before(a) and after(b) absorption of Eu?MOFs for MBConditions: 10 mg Eu?MOF, 6 mL 20 mg/L MB aqueous solution.

Fig.9 Adsorption effect of Eu?MOFs in MB aqueous solution(20 mg/L) at different time(A) UV?Vis spectra; (B) related photographs.

Fig.10 Adsorption effect of Eu?MOFs for 10 mg/L MB+10 mg/L MO mixed dyes(A) UV?Vis spectra; (B) related photographs.

Fig.11 Adsorption effect of Eu?MOFs for 10 mg/L MB+10 mg/L Rh6G mixed dyes(A) UV?Vis spectra; (B) related photographs.

Fig.12 Adsorption effect of Eu?MOFs for 10 mg/L MB+10 mg/L XO mixed dyes(A) UV?Vis spectra; (B) related photographs.

Fig.13 UV?Vis spectra of the Eu?MOF for adsorption of MB in different cycles

Fig.14 PXRD patterns(A) and FTIR spectra(B) of Eu?MOFs after several adsorption?desorption cycles of MBa.After desorption; b. after adsorption; c. original(means the Eu?MOF after grind); d. as?synthesized; e. simulated.

Fig.15 Graphs of Eu?MOF crystal before absorption(A) and crushed crystal after absorbing MB molecules(B)

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