Efficient removal of ⁹⁹TcO₄⁻ from nuclear wastewater is of great significance for the safe development of nuclear energy. In this work, a viologen-based cationic porous aromatic framework (TZ-PAF) was prepared as a novel sorbent for TcO₄⁻. With 4,4′-bipyridine as the linker units, tetraphenylmethane was selected as the knot units to construct the diamond-like topology structure of TZ-PAF, which was benefit to its outstanding structural stability (thermal stability and acid resistance). The batch sorption experiments showed that TZ-PAF possessed fast sorption kinetics, higher sorption capacity (982 mg g⁻¹ for ReO₄⁻) and a highest removal depth (K_d for TcO₄⁻ was 5.02 × 10⁶ mL g⁻¹), which could be attributed to the low-density skeleton of TZ-PAF resulting in the high density of sorption sites. XPS and SEM analyses revealed that the mechanism of TcO₄⁻/ReO₄⁻ capture was attributed to an anion-exchanged process in which Cl⁻ of TZ-PAF was replaced by ReO₄⁻. And more, the excellent reusability to capture ReO₄⁻ from a highly acidic solution (64.6%) and a simulated nuclear wastewater (77.6%) were obtained. In general, this work exhibited a new sorbent for the highly efficient and deep removal of TcO₄⁻ form nuclear wastewater, and would provide a valuable insight into designing novel high-stability sorbents for wastewater treatment.

高效去除核废水中的⁹⁹ TcO ₄ ^-对核能安全发展具有重要意义。在这项工作中，制备了基于紫精的阳离子多孔芳香骨架（TZ-PAF）作为新型 TcO ₄ ^-吸附剂。以4,4'-联吡啶为连接单元，选择四苯甲烷作为结单元构建了TZ-PAF的类金刚石拓扑结构，这有利于其出色的结构稳定性（热稳定性和耐酸性）。批量吸附实验表明，TZ-PAF 具有快速的吸附动力学、更高的吸附容量（ReO ₄ ^{-为 982 mg g -1}）和最高的去除深度（KTcO ₄ ^-的_d为5.02 × 10 ⁶ mL g ^-1 )，这可归因于TZ-PAF的低密度骨架导致高密度的吸附位点。XPS和SEM分析表明，TcO ₄ ^- /ReO ₄ ^-的捕获机制归因于阴离子交换过程，其中TZ-PAF的Cl ^-被ReO ₄ ^-取代。此外，还获得了从高酸性溶液（64.6%）和模拟核废水（77.6%）中_{捕获 ReO 4} ^-的优异可重复使用性总的来说，这项工作展示了一种新型吸附剂，用于高效和深度去除 TcO₄ ^-形成核废水，并将为设计用于废水处理的新型高稳定性吸附剂提供有价值的见解。