Luo Xiaoxia, Ren Xianliang, Wang Hongwei
Chongqing College of Mobile Communication Chongqing 401520 P. R. China
National Key Laboratory of Advanced Casting Technologies, Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University Chongqing 400044 P. R. China
RSC Adv. 2024 Oct 30;14(47):34746-34755. doi: 10.1039/d4ra05531d. eCollection 2024 Oct 29.
This work focuses on the application potential of novel MXene materials in the field of uranium-containing wastewater adsorption, particularly addressing gaps in existing research. Ultra-thin layered TiVCT was selected as the core adsorbent to thoroughly investigate its adsorption performance of uranium(U(vi))-containing wastewater. By compounding with sodium alginate, we successfully prepared easily recoverable aerogel beads and evaluated their adsorption capacity for ultra-low concentrations of U(vi) in seawater. The findings of this study reveal that TiVCT exhibits optimal adsorption capacity for U(vi) in a weakly acidic environment with a pH of 5.59, and its maximum adsorption capacity for U(vi) reaches up to 336 mg g, demonstrating superior performance when it comes to other MXene materials. Further research reveals that the adsorption mechanism involves the synergistic effect of electrostatic adsorption and reduction adsorption, exhibiting monolayer adsorption characteristics, and the adsorption process is a spontaneous endothermic reaction. Notably, in simulated complex seawater environments, even when the U(vi) concentration is as low as, for instance, 3.3 μg L, 50 mg of aerogel beads can still achieve an adsorption capacity of 3.89 mg g for 60 L of seawater. These findings underscore the outstanding performance of TiVCT as a novel MXene material in U(vi) adsorption and its broad potential for practical applications.
这项工作聚焦于新型MXene材料在含铀废水吸附领域的应用潜力，尤其致力于填补现有研究的空白。选择超薄层状TiVCT作为核心吸附剂，深入研究其对含铀（U(vi)）废水的吸附性能。通过与海藻酸钠复合，成功制备了易于回收的气凝胶珠，并评估了它们对海水中超低浓度U(vi)的吸附能力。本研究结果表明，TiVCT在pH为5.59的弱酸性环境中对U(vi)表现出最佳吸附能力，其对U(vi)的最大吸附容量高达336 mg/g，与其他MXene材料相比性能优越。进一步研究表明，吸附机制涉及静电吸附和还原吸附的协同作用，呈现单层吸附特征，且吸附过程是自发的吸热反应。值得注意的是，在模拟复杂海水环境中，即使U(vi)浓度低至例如3.3 μg/L，50 mg气凝胶珠对60 L海水仍可实现3.89 mg/g的吸附容量。这些发现突出了TiVCT作为一种新型MXene材料在U(vi)吸附方面的卓越性能及其广阔的实际应用潜力。
