Fabricating\nPorous Alkali-Resistant Resin for Segregation\nof Perrhenate/Pertechnetate Anions from Wastewater

The elimination of the β-emitting pertechnetate\nion (<sup>99</sup>TcO<sub>4</sub><sup>–</sup>) from highly\nalkaline\ntank waste poses a daunting challenge that is of great significance\nfor nuclear safety and environmental protection. Herein, we report\na strategy to fabricate an alkaline-stable porous resin (PANPEI–MeCl)\nthat features hyperbranched quaternary amine groups grafted on the\nsurface and confined within the pores of a superhydrophobic polymer\nmatrix synthesized by a one-pot method, exhibiting a clear superiority\nboth in adsorption kinetics and efficiency compared with available\ncommercial anion-exchange resins applying to <sup>99</sup>TcO<sub>4</sub><sup>–</sup> capture. Notably, the alkaline stability\nof the resin can be improved by manipulating the length of side chain\nalkyl groups, and it shows ultrahigh structural integrity and prominent\nperformance toward acid/alkaline soaking, high-temperature calcination\nprocedures, and high doses of ionizing radiation. Encouraged by its\nexcellent peculiarity, PANPEI–MeCl can continuously capture\nmost of the ReO<sub>4</sub><sup>–</sup> from the simulated\nradioactive waste by using a sequential injection automatic separation\nsystem.