Zhang Xiaofei, Wang Zheng, Guo Xuejie
Department of Chemical Engineering, Hebei Petroleum University of Technology, Chengde, 067000, People's Republic of China.
Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, College of Environmental and Biological Engineering, Putian University, Putian, 351100, People's Republic of China.
Sci Rep. 2025 Jan 29;15(1):3727. doi: 10.1038/s41598-025-87642-z.
MXenes, as a novel two-dimensional lamellar material, has attracted much attention. However, MXenes lamellar are prone to collapse and stacking under hydrogen bonding and interlayer van der Waals forces, which affects their electrochemical and capacitive deionization performance. A three-dimensional Ni-1,3,5-benzenetricarboxylate/TiCT (Ni-BTC/TiCT) composite electrode material was developed to enhance the electrochemical and capacitive deionization performance. The uniformly decorated Ni-BTC can prevent MXenes from aggregation and provide a large specific surface area and rich pore structure. As a substrate supporting Ni-BTC, MXenes can effectively disperse the growth of Ni-BTC and enhance the ion transport rate. In addition, the unique three-dimensional structure of Ni-BTC/TiCT provides horizontal charge transfer paths like two-dimensional nanosheets and has unique vertical charge transfer paths between nanosheets. Therefore, the Ni-BTC/TiCT exhibits an exceptional chromium(VI) removal rate of 94.1%. The electrosorption capacity of the Ni-BTC/TiCT for chromium(VI) is 124.5 mg g, much higher than that of the pure TiCT (55.5 mg g). The superior CDI efficiency accomplished through the Ni-BTC/TiCT electrode is due to the unique three-dimensional network structure and synergistic effect of the pseudocapacitance generated by the unique assembly of Ni-BTC and TiCT. Ni-BTC/TiCT is a promising CDI electrode material that can be used for capacitive deionization.
MXenes作为一种新型二维层状材料，已引起广泛关注。然而，MXenes薄片在氢键和层间范德华力作用下容易坍塌和堆叠，这影响了它们的电化学和电容去离子性能。为了提高电化学和电容去离子性能，开发了一种三维镍-1,3,5-苯三甲酸酯/TiCT（Ni-BTC/TiCT）复合电极材料。均匀修饰的Ni-BTC可以防止MXenes聚集，并提供大的比表面积和丰富的孔结构。作为支撑Ni-BTC的基底，MXenes可以有效地分散Ni-BTC的生长并提高离子传输速率。此外，Ni-BTC/TiCT独特的三维结构提供了类似于二维纳米片的水平电荷转移路径，并且在纳米片之间具有独特的垂直电荷转移路径。因此，Ni-BTC/TiCT对六价铬的去除率高达94.1%。Ni-BTC/TiCT对六价铬的电吸附容量为124.5 mg/g，远高于纯TiCT（55.5 mg/g）。通过Ni-BTC/TiCT电极实现的卓越电容去离子效率归因于独特的三维网络结构以及Ni-BTC和TiCT独特组装产生的赝电容的协同效应。Ni-BTC/TiCT是一种有前途的用于电容去离子的电容去离子电极材料。
