Hu Yi, Wang Hongwei, Ren Xianliang, Wu Fang, Liu Gaobin, Zhang Shufang, Luo Haijun, Fang Liang
Chongqing Key Laboratory of Interface Physics in Energy Conversion, College of Physics, Chongqing University, Chongqing 400044, China.
Key Laboratory on Optoelectronic Functional Materials, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
Nanomaterials (Basel). 2024 Nov 29;14(23):1925. doi: 10.3390/nano14231925.
Pore structural regulation is expected to be a facile way to enhance the adsorption performance of MXene. In this work, spherical foam composites consisting of TiCT and sodium alginate (SA) were synthesized via a vacuum freeze-drying technique. By varying the solution volume of TiCT, four distinct TiCT@SA spherical foams with honeycomb-like and lamellar structures with a pore diameter in the range of 100-300 μm were fabricated. Their methylene blue (MB) adsorption performances were then systematically compared. The results revealed that the honeycomb-like porous-structured spherical foams have a significantly higher adsorption capacity than their lamellar counterparts. Notably, the TiCT@SA honeycomb-like porous foam exhibited a remarkable maximum adsorption capacity () of 969 mg/g, positioning it at the forefront of MB adsorbent materials. Respective analysis of the adsorption kinetics, thermodynamics, and isotherm model indicated that this MB adsorption of TiCT@SA honeycomb-like porous foam is characterized to be a physical, endothermic, and monolayer adsorption. The TiCT@SA honeycomb-like porous foam also demonstrated excellent resistance to ion interference and good reusability, further attesting to its substantial potential for practical applications. X-ray photoelectron spectroscopy (XPS) analysis was employed to elucidate the adsorption mechanism, which was found to involve the synergistic effect of electrostatic adsorption and amidation reaction. This work not only offers new avenues for the development of high-performance adsorption materials but also provides crucial insights into the structural design and performance optimization of porous materials.
孔结构调控有望成为增强MXene吸附性能的一种简便方法。在本工作中，通过真空冷冻干燥技术合成了由TiCT和海藻酸钠（SA）组成的球形泡沫复合材料。通过改变TiCT的溶液体积，制备了四种具有蜂窝状和层状结构、孔径在100 - 300μm范围内的不同TiCT@SA球形泡沫。然后系统地比较了它们对亚甲基蓝（MB）的吸附性能。结果表明，蜂窝状多孔结构的球形泡沫比其层状对应物具有显著更高的吸附容量。值得注意的是，TiCT@SA蜂窝状多孔泡沫表现出969 mg/g的显著最大吸附容量（），使其处于MB吸附剂材料的前沿。对吸附动力学、热力学和等温线模型的分别分析表明，TiCT@SA蜂窝状多孔泡沫对MB的吸附具有物理、吸热和单层吸附的特征。TiCT@SA蜂窝状多孔泡沫还表现出优异的抗离子干扰能力和良好的可重复使用性，进一步证明了其在实际应用中的巨大潜力。采用X射线光电子能谱（XPS）分析来阐明吸附机制，发现其涉及静电吸附和酰胺化反应的协同作用。这项工作不仅为高性能吸附材料的开发提供了新途径，还为多孔材料的结构设计和性能优化提供了关键见解。
