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Re(VII) combined with zirconium tetragonal unit cell structure (left) and monoclinic unit cell structure (right)
Recently, the research group of the Plasma Institute of the Institute of Plasma Physics, Chinese Academy of Sciences, Institute of Plasma Physics, Chinese Academy of Sciences, Chen Longlun's research group designed a synthetic zirconia/graphene composite material to achieve efficient enrichment of Re(VII). Related research was published in the American Chemical Society's journal ACS Sustainable Chemistry & Engineering.
Zirconia not only has the characteristics of large specific surface area and uniform pore size of mesoporous materials, but also has acidic and alkaline surface centers, easy to produce oxygen vacancies, and therefore has good adsorption performance, and has broad application prospects in sewage treatment. Zirconia has a tetragonal cell structure and a monoclinic cell structure. Chen Changlun's team of researchers found through theoretical calculations that the zirconia binding ratio of Re(VII) to the tetragonal unit cell structure is greater than that of monoclinic unit cell structure zirconia, and the combination is more stable. The research team used zirconia supported on graphene to convert the monoclinic cell structure of zirconium oxide into a tetragonal cell structure. At the same time, zirconia and graphene formed a synergistic enrichment effect. Therefore, zirconium oxide/graphene composites were The enrichment ability of (VII) is greatly enhanced. As an element in the group VIIB, it has similar chemical properties as lanthanum, and is often used as a non-radioactive model element for thorium. Therefore, the zirconia/graphene composites can be used to enrich the easily eutectic Tc(VII) which reduces the high valence state and thus to control radioactive Tc(VII) pollution.
The study was funded by the National Natural Science Foundation of China.
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