US EPA

8802452 

Journal Article 

Preparation of MIL-125(Ti)/NH2-MIL-125(Ti) materials and their adsorption properties for uranyl ions 

Zhang, L; Xu, C; Chen, Y; Zhang, W 

2020 

Yes 

Huanjing Kexue Xuebao / Acta Scientiae Circumstantiae
ISSN: 0253-2468 

40 

6 

2055-2065 

Chinese 

10.13671/j.hjkxxb.2020.0004 

It has realistic significance to environmental protection, finding the efficient, high-absorption and high-selectivity adsorbents to deal with uranium-containing wastewater. Herein we report two Mental-Organic Framework materials MIL-125 and NH2-MIL-125 synthesized by solvothermal method. The materials have been characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetry analysis/differential scanning calorimetry (TGA/DSC). The adsorption performance of the adsorbents for UO22+ were investigated at different initial pH, uranium concentration, and contact time. The results showed that MIL-125 and NH2-MIL-125 were synthesized successfully, and the synthesized powders exhibited the strongest adsorption capacity for UO22+ when the initial pH was 5 and 8, respectively. A comparison of the Langmuir, Freundlich equations to describe UO22+ adsorption properties of the two materials showed that the adsorption processes were more consistent with the Langmuir equation. At 25 ℃, the maximum adsorption capacity of MIL-125 and NH2-MIL-125 were 264.4 mg•g-1 and 327.3 mg•g-1, and the optimal adsorption time were 480 min and 70 min. © 2020, Science Press. All right reserved. 

Mental-organic frameworks; MIL-125; NH2-MIL-125; Uranyl ion