Synthesis and characterization of some transition metals of benzene-1,3,5-tricarboxylic acid and adsorption of lead ion studies

C.W. Dikio, E.B. AttahDaniel, D. Wankasi, F. Mtunzi
Vaal University of Technology,
South Africa

Keywords: metal organic frameworks, solvothermal synthesis, benzene-1;3;5-tricarboxlic acid, transition metals

Summary:

Metal organic frameworks of gallium, lanthanum, zinc, manganese, cobalt and copper were synthesized and characterized by Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDXS), Thermogravimetric analysis (TGA), Derivative thermogravimetric analysis (DTG) and X-Ray Diffraction spectroscopy (XRD). The results indicate the formation of crystalline particles of the individual metal MOFs with characteristic metal-oxygen vibrations v(M-O) among other symmetric and asymmetric vibrations in the FTIR and the presence of these metals in the EDXS spectra. Thermodynamic investigation of the adsorption of lead ions on lanthanum metal organic framework was carried out at pH (3 – 7), time (0 – 180 min), temperature (289.15, 299.15 & 310.15K) and concentration (20 – 60 mg/L). Adsorption of lead ions increased with concentration and temperature. The optimum adsorption of lead ion on LaMOF was at pH of 6.