Abstract
The metal–organic frameworks material functionalized by grafting amino group of tetraethylenepentamine on the coordinative unsaturated Cr (III) centers is described. The obtained tetraethylenepentamine-functionalized adsorbents with different mass ratios of tetraethylenepentamine have been characterized by scanning electron microscopy, Fourier-transform infrared, X-ray powder diffraction, and N2 adsorption and desorption isotherms. Significantly, MIL-101-tetraethylenepentamine 60% exhibited high adsorption capacity (350 mg/g) for removal of uranium (VI) from water at pH 4.5. At uranium concentration <20 mg/L, the isothermal plot was best represented by Freundlich model. At U(VI) concentration approximately >30 mg/L, the isotherm was best described by Langmuir model.
Highlights
With the rapid development of industry, more and more waste is polluting the environment and the natural resources
The morphology of the MIL-101(Cr) Metal–organic frameworks (MOFs) in Figure 1(a) shows the granular crystal with a particle size of about 200 nm, which differs from previously reported MIL-101 crystals synthesized by Bai et al (2015) using hydrofluoric acid (HF) as mineralizer
As amino group had strong adsorption property to uranyl ions, TEPA was successfully intruduced into MOF to obtain MIL-101 (Cr) MOF such as TEPA-MIL-101s and was thermally stable at 318 K
Summary
With the rapid development of industry, more and more waste is polluting the environment and the natural resources. In the course of generation of nuclear power large amount of nuclear waste is produced, which can contaminate waste water with uranium. In the development of nuclear energy, it produces large amount of radioactive substances containing uranium in the waste water. Purification of industrial waste water such as nuclear mill effluents is becoming the focusing issue (Gao and Gao, 2014; Xia et al, 2008). In order to increase the utilization rate of resources and reduce the harm of radioactive waste water, uranium separation, and enrichment should be carried out as an important research project. Extraction of uranium from uranium bearing waste water can improve the utilization of uranium resources and reduce the gap between supply and demand
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