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 (β_Re/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

在这项工作中，通过辐射接枝法制备了含有丰富氮含量的氨基三唑改性微晶纤维素微球（3-ATAR）作为有前景的吸附剂，用于在酸性溶液中 UO ₂ ²⁺存在下选择性回收 ReO ₄ ^-。设计了一系列包括单组分和二元系统的批量和柱吸附实验来评估 Re(VII) 在 3-ATAR 上的吸附和分离性能。3-ATAR对Re(VII)表现出良好的吸附容量（最大146.4 mg·g ^-1）和快速的吸附速率，平衡时间为45 min。在二元溶液中，高选择性系数 (β _Re/M) 表明 3-ATAR 可以从 U(VI) 和其他金属离子 (Cu(II)、Cr(III)、Ni(II)、Zn(II)) 中分离和回收 Re(VII)。特别是，发现无论 U(VI) 改变多少，Re 的吸附在含 U/Re 的溶液中几乎不受影响。在柱实验中，当 U(VI) 的浓度比 Re(VII) 的浓度高 40 倍时，3-ATAR 表现出对来自合成铀矿浸出液的 U(VI) 的高 Re(VII) 选择性。这项工作表明，3-ATAR 可以为从铀矿石渗滤液和其他潜在来源中回收 Re(VII) 提供一种高效、选择性、可持续和工业可行的方法。

图形概要