The treatment of uranyl waste produced in the nuclear industry has remained a problem for a long time. In this paper, MOF-76(Gd) was synthesized by the hydrothermal method, and the regular layered porous gadolinium oxide (α-Gd 2 O 3 ) was prepared by this template. We measured the adsorption capacity of the materials for U(VI) under different conditions by intermittent adsorption experiments. The experimental data are utilized in an attempt to establish a mathematical model on the basis of which the adsorption mechanism of the material is analyzed. The results show that the maximum adsorption capacity of the material is 1350.2 mg/g in an aqueous solution and 1180.0 mg/g in seawater at 25 °C in atmospheric pressure. The material has good selective adsorption and interference resistance.
Pollution in nuclear industry is a difficult problem to solve. To solve this problem, we synthesized the NH2‐MIL‐125 modified materials (MIL‐125‐P@TiO2) by hydrothermal synthesis and also investigated the adsorption properties of uranyl ions. To improve the adsorbability of materials, we loaded titanium dioxide and phosphorylate it. The materials were characterized by means of XRD, SEM, infrared, thermogravimetric and XPS. The adsorption properties of uranyl ions on the two materials were studied by batch adsorption experiments. The results showed that the maximum adsorption capacity of modified material is 333.62 mg/g and 614.82 mg/g at 25 degrees Celsius by fitting the Langmuir model respectively, and the modified material has a better adsorption ability at 25 degrees Celsius with initial uranium concentration at 100 mg/L.
MgAl-LDH@MIL-88A as an effective adsorbent was successfully prepared by a simple stirring method in water bath through loading MIL-88A onto the surface of flowerlike MgAl-LDH, which was synthesized via solvothermal method. Interestingly, the results of characterizations showed that the MIL-88A could still grow, but extrude the brucite-like layers of MgAl-LDH. The influences of initial solution pH, contact time, temperature, and co-existing ions on the adsorption performance of MgAl-LDH@MIL-88A were studied systematically by batch static adsorption experiments. It was found that MgAl-LDH@MIL-88A represented the highest adsorption loading of fluoride (14.00 mg g−1) at initial pH 7.0 in 420 min. The uptake process was described appropriately by the pseudo-second-order, the Temkin and the Freundlich isotherm models. The thermodynamic parameters confirmed the endothermic and spontaneous nature of adsorption. MgAl-LDH@MIL-88A was the green adsorbent as the residual mental contents ([Mg2+] = 1.095 mg L−1, [Fe3+] = 0.007 mg L−1, [Al3+] = 0.076 mg L−1) after adsorption met the Chinese sanitary standard for drinking water (GB 5749-2006). The mechanism of fluoride removal by MgAl-LDH@MIL-88A involved the electrostatic interactions between Fe3+ of MIL-88A and fluoride, and ligand exchange among hydroxyl groups of MgAl-LDH, carboxylate groups of the C4H4O4 and fluoride.
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