School of Material Science and Engineering, University of Jinan, Jinan, 250022, PR China.
Faculty of Chemical Engineering and Technology, Cracow University of Technology, Krakow, Poland.
Environ Res. 2023 Jun 15;227:115793. doi: 10.1016/j.envres.2023.115793. Epub 2023 Mar 29.
Accordion-like TiCT MXene supplied a possibility to construct two-dimensional composites with novel performance. In this paper, few-layered TiCT MXene was created via a chemical etching strategy. The oxidation in-situ using a powerful alkaline solution resulted successfully in TiO nanocrystals grown on TiCT nanosheets. The alkaline treatment adjusted terminations of the TiCT MXene and controlled the oxidation degree by changing temperature. The ratio of TiCT and TiO was finally optimized. Because of TiCT nanosheets with well conductivity and excellent light absorption as well as TiO nanocrystal arrays on TiCT nanosheets with a high specific surface area and more active sites, TiO/TiCT composites revealed excellent photocatalystic activity, especially for NO removal. The improvement of separation and transfer efficiency of phootogenerated carriers is ascribed to the microstructure of TiO/TiCT composites. The composite sample synthesized at 75 °C revealed the best NO removal efficiency, in which 70% of NO was removed at a concentration of 600 ppb. This study offers a new thought for preparing high performance MXene-based photocatalysts.
手风琴状的 TiCT MXene 为构建具有新颖性能的二维复合材料提供了可能。本文通过化学刻蚀策略制备了少层 TiCT MXene。使用强大的碱性溶液原位氧化成功地在 TiCT 纳米片上生长了 TiO 纳米晶。碱性处理通过改变温度调整了 TiCT MXene 的端基并控制了氧化程度。最终优化了 TiCT 和 TiO 的比例。由于 TiCT 纳米片具有良好的导电性和优异的光吸收能力，以及 TiCT 纳米片上的 TiO 纳米晶阵列具有高比表面积和更多的活性位点，TiO/TiCT 复合材料表现出优异的光催化活性，特别是对 NO 的去除。光生载流子的分离和转移效率的提高归因于 TiO/TiCT 复合材料的微观结构。在 75°C 下合成的复合样品显示出最佳的 NO 去除效率，在 600ppb 的浓度下，有 70%的 NO 被去除。本研究为制备高性能 MXene 基光催化剂提供了新的思路。
