National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, PR China.
National Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, PR China; Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, PR China.
Sci Total Environ. 2023 Jul 15;882:163462. doi: 10.1016/j.scitotenv.2023.163462. Epub 2023 Apr 15.
N-doped biochar (AL-N/BC) prepared by pyrolyzing lignin in various temperatures manifested superefficient performance for uranium (U) recycling from nuclear wastewater. The optimist AL-N/BC-700 showed higher adsorption capacity of 25,000 mg/g and faster kinetics of 4100 g·min·mg than the most of reported adsorbents, and excellent adsorption-desorption capability (adsorption rate > 90 % and desorption rate > 70 % after 12 cycles). Moreover, the high applicability of AL-N/BC-700 was verified by its superefficient U(VI) adsorption performance in a broad working pH range, various water matrices, and high irradiation stability. Furthermore, the adsorption mechanism discloses the significant role of graphitic N, rather than pyridinic N or pyrrolic N, for U(VI) adsorption. Overall, this work not only presents an applicable approach to alleviate the increasingly serious energy crisis via recycling U(VI) from nuclear wastewater, but also enriches the method of synthesizing N-doped materials for U(VI) adsorption.
N 掺杂生物炭（AL-N/BC）通过在不同温度下热解木质素制备，表现出从核废水中回收铀（U）的超高效率。优化后的 AL-N/BC-700 的吸附容量高达 25000mg/g，动力学更快，为 4100g·min·mg，优于大多数已报道的吸附剂，且具有优异的吸附-解吸性能（12 次循环后吸附率>90%，解吸率>70%）。此外，AL-N/BC-700 在宽工作 pH 值范围、各种水基质和高辐照稳定性下均表现出超高的 U(VI)吸附性能，验证了其高适用性。此外，吸附机理表明，石墨 N 而非吡啶 N 或吡咯 N 对 U(VI)吸附具有重要作用。总的来说，这项工作不仅提供了一种可行的方法，通过从核废水中回收 U(VI)来缓解日益严重的能源危机，而且还丰富了合成用于 U(VI)吸附的 N 掺杂材料的方法。
