Synthesis and Characterization of Utsa-76 Metal Organic Framework Containing Lewis Basic Sites for the Liquid-Phase Adsorption of Uvi

Abstract

UTSA-76 encoded MOF structure containing Lewis basic groups was efficiently synthesized and characterized for the removal of U-VI from the liquid phase by using adsorption technique. H-1, C-13-NMR, FT-IR, P-XRD, TEM, TEMEDX, BET, SEM and SEM-EDX mapping techniques were applied to define this adsorbent material. Adsorption of U-VI on the synthesized UTSA-76 structure was investigated depending on the parameters of pH, temperature, mixing time and solution concentrations. In the kinetic of adsorption process, not only the pseudo-second-order kinetic, but also film diffusion was effective. The adsorption equilibrium of U-VI on UTSA-76 explained better by Langmuir isotherm model and the qmax from Langmuir isotherm was calculated as 91.31 mg/g. The synthesized MOF structure (UTSA-76) demonstrated a removal rate from 12 ppm to 0.25 ppm in 45 min to a very low UO22+ ion concentration of about 98 % using a low adsorbent mass of 5 mg, and UTSA-76 with this adsorption performance will be among the highly preferred effective adsorbents for uranium adsorption.