Guo Lijun, Peng Liangqiong, Li Jiheng, Zhang Wenhua, Shi Bi
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.
Environ Res. 2023 Apr 15;223:115416. doi: 10.1016/j.envres.2023.115416. Epub 2023 Feb 2.
The efficient recycling of uranium (U) by adsorbents remains challenging due to the strong interference from coexisting impurities, insufficient desorption efficiency, and weak irradiation instability. In this work, a novel lignin-derived biochar (AL/BC) with high surface area and abundant functional groups was developed through a green and simple pyrolysis process, and an adsorbent for U(VI) capture was used. The optimist AL/BC-600 exhibited ultrahigh adsorption capacity for U(VI) of 4007 mg/g, possessing a wide pH range of 1-11, and powerful anti-interference ability when coexisting with various common cations and anions. In addition, AL/BC-600 showed high tolerance even under strong irradiation at a dose of 350 kGy. Most importantly, after the tenth round of the adsorption-desorption cyclic utilization, the adsorption efficiency and desorption rate of AL/BC-600 were actually over 95% and 80%, respectively. Hence, this study provides a green and simple process for synthesizing a novel adsorbent for highly efficient U(VI) capture, not only paving a path for alleviating the increasingly serious energy crisis, but also facilitating the low-carbon and circular development of lignin.
由于共存杂质的强烈干扰、解吸效率不足以及辐照稳定性较弱，吸附剂对铀（U）的高效回收仍然具有挑战性。在这项工作中，通过绿色且简单的热解过程制备了一种具有高比表面积和丰富官能团的新型木质素衍生生物炭（AL/BC），并将其用作捕获U(VI)的吸附剂。优化后的AL/BC-600对U(VI)表现出4007 mg/g的超高吸附容量，具有1-11的宽pH范围，并且在与各种常见阳离子和阴离子共存时具有强大的抗干扰能力。此外，即使在350 kGy的强辐照下，AL/BC-600也表现出高耐受性。最重要的是，在第十轮吸附-解吸循环利用后，AL/BC-600的吸附效率和解吸率实际上分别超过了95%和80%。因此，本研究提供了一种绿色且简单的工艺来合成用于高效捕获U(VI)的新型吸附剂，不仅为缓解日益严重的能源危机铺平了道路，还促进了木质素的低碳循环发展。
