A Comparative Study of Different Synthetic Methods of Copper Metal-Organic Frameworks (Cu-MOF)

P.M. Thabede*, and N.D. Shooto

Applied Chemistry and Nano Science Laboratory, Department of Chemistry, Vaal University of Technology P.O. Box X021, Vanderbjlpark 1900, South Africa

*Corresponding author: E-mail: mapulepseabelo@gmail.com

Abstract

The metal-organic framework of copper (Cu-MOF) was prepared using the reflux method and microwave method. The results of the two techniques were compared with each other to determine the best method to prepare Cu-MOF. Preparation of Cu-MOF using different techniques has shown that it influences the morphology of the MOF. The results showed that there was a correlation between the two methods. The obtained products were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), Fourier transform infrared (FTIR), thermogravimetric analysis (TGA) and ultraviolet-visible (UV-Vis) spectroscopy. The SEM images showed that the microwave method synthesized particles were cubic while the reflux method produced amorphous material. The XRD spectra showed intense diffraction peaks at 2θ values of 17.61º, 20.47º, 25.34º, 29.59º, 43.01º and their miller indices were (511), (442), (731), (751) and (662), respectively. FTIR results revealed that the materials had functional groups such as (C=O, C-O, O-C=O and Cu-O), UV-visible results showed optical absorption band of Cu-MOF was at 274.18 nm for the microwav and 274.41 nm for the reflux methods. This band could be allocated to the charged transfer from the oxygen in carboxylate to Cu2+ ions.

Keywords

Copper, Metal-organic frameworks, Microwave method, Reflux method.

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