Abstract
With the aim of removing 99Mo from radioactive wastewater, a metal-organic framework Zr-MOF and its functionalized derivatives (Zr-MOF-SO4 and Zr-MOF-C2O4) were prepared as adsorbents, and characterized by SEM, XPS and FI-IR. The results showed the –SO4 and –C2O4 groups were successfully loaded onto the surface of the original Zr-MOF; the obtained Zr-MOF-SO4 and Zr-MOF-C2O4 presented different morphologies as small pellets. Both exhibit high adsorption efficiency and fast adsorption rates due to their abundant –SO4 and –C2O4 surface groups, that provide many adsorption sites for Mo(VI). The maximum adsorption capacities for Mo(VI) of Zr-MOF-SO4 and Zr-MOF-C2O4 are 192.5 mg g−1 and 432.3 mg g−1, respectively, which is an improvement over other similar adsorbents. In addition, thermodynamic studies indicate a spontaneous exothermic mechanism for the adsorption process. These results demonstrate that anchoring of the functionalized groups is a good way to improve Mo(VI) adsorption capacity of MOF materials.
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