Abstract
In this work, aminotriazole-modified microcrystalline cellulose microsphere (3-ATAR) containing an abundant nitrogen content as promising adsorbent was prepared via a radiation grafting method for the selective recovery ReO4- in the presence of UO22+ in acidic solution. A series of batch and column adsorption experiments including monocomponent and binary systems were designed for evaluating the adsorption and separation performance of Re(VII) onto 3-ATAR. The 3-ATAR exhibited a good adsorption capacity (max 146.4 mg·g-1) of Re(VII) and a rapid adsorption rate, with equilibrium time of 45 min. In binary solution, the high selectivity coefficients (βRe/M) indicated that 3-ATAR could separate and recover Re(VII) from U(VI) and other metal ions (Cu(II), Cr(III), Ni(II), Zn(II)). In particular, it was found that the adsorption of Re was almost unaffected in U/Re-bearing solutions no matter how much the U(VI) was changed. In the column experiment, when the concentration of U(VI) was 40 times higher than that of Re(VII), 3-ATAR manifested high Re(VII) selectivity over U(VI) from a synthetic uranium ore leachate. This work demonstrated that 3-ATAR could provide an efficient, selectively, sustainable, and industrially feasible way for Re(VII) to be recovered from uranium ore leachate and other prospective sources.Graphical abstract.
Highlights
Rhenium, as a rare and valuable metal, with a melting point of 5869 K, the boiling point of 5869 K, superior, high-temperature strength, and room-temperature ductility, plays an important role in various industrial sectors, such as in nuclear, aerospace, missile, and petrochemicals (Abisheva et al 2011; Wang and Wang 2018)
Aminotriazole-modified microcrystalline cellulose microspheres (3-ATAR) containing an abundant nitrogen content as promising adsorbent was prepared via a radiation grafting method for the selective recovery ReO4- in the presence of UO22+ in acidic solution
FTIR and Scanning electron microscope (SEM) figures of MCC, MCC-g-Glyceryl methacrylate (GMA) and 3ATAR are discussed in detail in the supporting information S3
Summary
As a rare and valuable metal, with a melting point of 5869 K (third-highest), the boiling point of 5869 K (second-highest), superior, high-temperature strength, and room-temperature ductility, plays an important role in various industrial sectors, such as in nuclear, aerospace, missile, and petrochemicals (Abisheva et al 2011; Wang and Wang 2018). Microcrystalline cellulose microspheres were chosen as a suitable adsorbent matrix for column filling because of its excellent mechanical properties, hydrophilicity, and easy functionalization (Dong et al 2016; Yang et al 2020). It is well-known that amino-1, 2, 4-triazole possesses a free amine functionality and an aromatic ring with good excellent chemical stability and a high nitrogen content (66.35% per mass unit). Introduction of amino-1, 2, 4-triazole to cellulose would increase the available active sites on cellulose for adsorbing Re(VI) and is expected to separate and recover Re(VII) from underground uranium ore leachate. FTIR and XPS studies were explored the adsorption mechanisms
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