Le Zhanggao, Xue Jinming, Wang Bo, Zhu Ye'an, Wu Zhiwen, Nie Yidan, Xie Zongbo
Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, Nanchang, 330013, China.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, 330013, China.
Photochem Photobiol Sci. 2023 Jan;22(1):59-71. doi: 10.1007/s43630-022-00298-w. Epub 2022 Sep 10.
As a clean energy source, nuclear energy can gradually replace traditional fossil energy sources, and is an important means to achieve the "double carbon goal". Uranium-containing wastewater is inevitable in the development of nuclear energy. The composites MIL/CNx of MOF material MIL-100(Fe) and carbon nitride (CN) were obtained by a simple solvo-thermal method using iron nitrate, homophthalic acid and CN. The material MIL-100(Fe) with high specific surface area was compounded with CN to increase the in-plane adsorption sites, which could adsorb 30% of uranium in solution during the dark reaction. The close interfacial contact of the two materials effectively inhibited the complexation of photo-generated electrons and holes and promotes electron migration. These two synergistic effects improved their overall photocatalytic reduction capacity, which could reduce 97% of UO in solution in 20 min. The UO removal efficiency of MIL/CN was 2.3 and 1.6 times higher than that of CN and MIL-100(Fe), respectively. In addition, MIL/CN was stable in reducing uranium during the five cycles of the experiment.
作为一种清洁能源，核能能够逐步替代传统化石能源，是实现“双碳目标”的重要手段。在核能开发过程中，含铀废水不可避免。采用硝酸铁、均苯四甲酸和氮化碳（CN）通过简单的溶剂热法制备了MOF材料MIL-100(Fe)与氮化碳的复合材料MIL/CNx。将具有高比表面积的材料MIL-100(Fe)与CN复合，增加面内吸附位点，在暗反应过程中可吸附溶液中30%的铀。两种材料紧密的界面接触有效抑制了光生电子和空穴的复合，促进了电子迁移。这两种协同效应提高了它们的整体光催化还原能力，在20分钟内可将溶液中的UO还原97%。MIL/CN对UO的去除效率分别比CN和MIL-100(Fe)高2.3倍和1.6倍。此外，在实验的五个循环中，MIL/CN在还原铀的过程中表现稳定。
