Adsorption Of Uranium In Aqueous In Aqueous Solution By UiO-66 Series MOFS

In recent years, the consumption of traditional energy was increasing, the issue of climate change was increasingly highlighted. So nuclear power has become an important option of various countries and regions for the energy development. However, the nuclear safety and environment problem were the bottleneck of the development of nuclear power, the solution of the environmental problems is closely related to the treatment of radioactive waste water, especially the separation of uranium from waste water and enrichment of uranium from seawater. So the looking for efficient, fast and highly selectively separation of uranium versatile material is of great significance. Metal-Organic framework(MOFs), as s member of porous materials, allow varying pore size and functionalities systematically have been extensively research. The Ui O-66 series MOFs were demonstrated to have high surface area, unprecedented chemical and versatile function and amino or carboxyl is good U(VI) functional coordination. This paper synthesized the Ui O-66, its amine derivative Ui O-66-NH2 and its double carboxylic derivative Ui O-66-2COOH by solvent and water-bath reaction, respectively. The prepared materials were characterized by PXRD, FT-IR, TGA and N2 sorption. The character results show that the success of synthesis, with a good stability of thermal and solution, large surface area and functional success.The effectiveness of three MOFs was assessed the effect of various parameters such as p H, contact time, initial concentration, ion strength and selectivity on the sorption was studied by static instruction under routine conditions. The experimental results show that the adsorption capacity of three MOFs is large and quick adsorption rates. Specifically, Ui O-66 and Ui O-66-NH2 were about 110 mg/g at p H=5.5, at around 4h to reach adsorption equilibrium. The U(VI) adsorption capacity of Ui O-66-2COOH was about 120 mg/g at p H=3.0 within 1 h. In particular, the three materials could selectively adsorbed U(VI) from the aqueous which containing a range of competing metal ions. Three materials are uniform single-layer chemical adsorption by the research of adsorption isotherm. The sorption capacity for three materials are larger than MIL-101 and MIL-101-NH2, but much lower than other MIL-101 amine derivative, MOF-76 and Ui O-68. However, Ui O-66 series MOFs were prepared by a simple solvothermal method in one step, using commonly used reagents. Especially Ui O-66-2COOH dozens of g can be obtained through simple water-bath reaction and do not need chemical reagents and complex reaction device. From this point of view, Ui O-66 series MOFs will be potential candidates in U(VI) removal from waste water ofU(VI) enrichment from seawater. This work new data for assessing the feasibility of this MOFs applied in the treatment of radioactive wastewater.