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Adsorption Kinetics of Methylene Blue on Synthesized DMF-MIL-101(Cr), a DMF-Functionalized Metal-Organic Framework

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Abstract:

An N, N-dimethylformamide (DMF)-functionalized metal–organic framework, namely, DMF-MIL-101(Cr), was prepared and then used for the adsorptive removal of methylene blue (MB), a cationic dye, from aqueous solutions. MIL-101(Cr) was synthesized by the hydrothermal method. Next, by dipping the MIL-101(Cr) sample in DMF, DMF-MIL-101(Cr) was synthesized. The results of X-ray diffraction analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis confirmed that DMF and MIL-101 could be combined successfully. More importantly, the MB uptake capacity of DMF-MIL-101(Cr) was significantly higher than that of MIL-101(Cr). Unlike MIL-101(Cr), DMF-MIL-101(Cr) could adsorb the entire MB in a solution with a concentration of 10.92 mg/L, owing to the electrostatic interactions between DMF and the MB molecules. In 100 mL of a 10.92-mg/L MB solution, DMF-MIL-101(Cr) can reach a state of absorbance equilibrium within10 min. After that, the adsorption process exhibited the characteristics of a zero-order reaction. This result indicates that it may be possible to exploit different functionalization methods and improve the rate of adsorption of dyes onto metal–organic frameworks.

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Periodical:

Key Engineering Materials (Volume 671)

Pages:

419-424

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.671.419

Citation:

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Online since:

November 2015

Authors:

Xin Liu, Yan Ying Zhao*

Keywords:

(DMF)-functionalized Metal-Organic Framework, Adsorption Kinetics, DMF-MIL-101(Cr), Methylene Blue, N N-Dimethylformamide

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* - Corresponding Author

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