Zhang Yong, Xue Zhengyang, Liu Xuan, Feng Jiaqi, Jiang Kexing, Liu Yujia
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, CAEA Innovation Center of Nuclear Environmental Safety Technology, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, China.
State Key Laboratory of Environment-friendly Energy Materials, Sichuan Co-Innovation Center for New Energetic Materials, CAEA Innovation Center of Nuclear Environmental Safety Technology, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, China.
Int J Biol Macromol. 2025 Mar;293:139299. doi: 10.1016/j.ijbiomac.2024.139299. Epub 2024 Dec 30.
With the development of the nuclear industry, the direct discharge of uranium-containing wastewater has become increasingly harmful to the environment. A novel graphene oxide-supported and phosphoric-crosslinked chitosan gel bead (C-PGCB) with excellent uranium uptake capability was successfully fabricated to treat uranium-containing wastewater. The experimental results showed that the introduction of PO and CO bonds through phosphoric acid crosslinking could greatly improve the capturing ability of chitosan-based materials, which could reach 97.1 % and 460.9 mg g within 20 min, respectively. In the presence of multiple coexisting ions, the adsorbent still maintained high uranium adsorption efficiency. After 5 cycles, the uptake efficiency of C-PGCB with good cycle stability remained above 90 %. The fitting both the dynamic model and the isotherm model showed that the uranium uptake of C-PGCB was a uniform single-layer chemisorption process. Furthermore, the excellent dynamic separation properties proved the great potential value in the uranium-containing wastewater treatment. The uptake of C-PGCB for uranium could be owed to synergistic complexation and electrostatic interaction between uranium and multifunctional groups on C-PGCB. This work offered a chitosan-based adsorbent to effectively remove uranium from wastewater and gave a novel and effective way for the construction of chitosan-based adsorbents to enhance capture performance.
随着核工业的发展，含铀废水的直接排放对环境的危害日益增大。一种具有优异铀吸附能力的新型氧化石墨烯负载磷酸交联壳聚糖凝胶珠（C-PGCB）被成功制备用于处理含铀废水。实验结果表明，通过磷酸交联引入P-O和C=O键可大幅提高壳聚糖基材料的捕获能力，在20分钟内捕获率分别可达97.1%和460.9 mg/g。在多种共存离子存在的情况下，该吸附剂仍保持较高的铀吸附效率。经过5次循环后，具有良好循环稳定性的C-PGCB的吸附效率仍保持在90%以上。动力学模型和等温线模型拟合结果表明，C-PGCB对铀的吸附是一个均匀的单层化学吸附过程。此外，其优异的动态分离性能证明了其在含铀废水处理中的巨大潜在价值。C-PGCB对铀的吸附归因于铀与C-PGCB上多功能基团之间的协同络合和静电相互作用。这项工作提供了一种基于壳聚糖的吸附剂以有效去除废水中的铀，并为构建具有增强捕获性能的壳聚糖基吸附剂提供了一种新颖有效的方法。
