Novel Cadmium-Based Metal-Organic Frameworks: Preparation and Application for Dye Adsorption

Abstract

In the present study, two novel Cd-MOF structures, [Cd(phen)2(4-aba)2](NO3)2 (Cd-MOF (I)) and [Cd(phen)2(4-aba)2](CH3COO)2 (Cd-MOF(II)) were successfully prepared from 1,10-phenanthroline (phen) and 4-amino benzoic acid (4-aba) and characterized by Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetric analysis (TGA), Brunauer–Emmett–Teller (BET), Scanning Electron Microscopy (SEM) and Nuclear Magnetic Resonance Spectroscopy (1H NMR) analysis. The synthesized Cd-MOFs were evaluated for the adsorption of methylene blue (MB) and methyl orange(MO) dyes. The Cd-MOF(I) adsorption capacity was 8.6x10-4 mmol/g for MO. The results showed that Cd-MOF(I) is a more effective adsorbent in removing anionic methyl orange. An adsorption mechanism based on electrostatic interactions and hydrogen bonds was proposed. Contrary to expectations, the fact that Cd-MOF (II) has a structure surrounded by acetate anions caused it to have a lower adsorption capacity.

Keywords

• Cadmium
• Metal-organic framework
• adsorption
• organic dyes

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