TiO2/ML-Ti3C2复合纳米材料的制备及其光催化性能

通过水热技术在二维(2D)多层材料Ti_3C_2 (multi-layer Ti_3C_2, ML-Ti_3C_2)的表面及层间原位晶化和生长锐钛矿相TiO_2纳米球,制备出TiO_2/ML-Ti_3C_2复合纳米材料。采用XRD、SEM、氮吸附等表征技术对TiO_2/ML-Ti_3C_2纳米复合材料进行分析表征,并以亚甲基蓝(MB)为模拟污染物,对纯TiO_2和TiO_2/ML-Ti_3C_2复合纳米材料的光催化性能进行了评价。实验结果表明,两种材料的耦合抑制了Ti O_2中光生电子-空穴对的湮灭,延长了复合光催化剂中载流子寿命,拓宽了复合材料的光谱响应范围。在紫外光照射下,以TiO_2/ML-Ti_3C_2复合纳米材料为光催化剂,200 mg/L的MB溶液在20 min内几乎完全脱色,降解率为98.98%。TiO_2/ML-Ti_3C_2纳米复合材料的光催化性能优于纯TiO_2和Ti_3C_2, Ti_3C_2优异的电子传输能力和超强的吸附性能优化了TiO_2的光催化性能。本研究为使用光催化技术处理废水提供了一种新的思路,具有一定的实际应用前景。

Preparation of TiO2/ML-Ti3C2 Composite Nanomaterials and Study on Its Photocatalytic Performance

TiO₂/ML-Ti₃C₂ composite nanomaterials were prepared by in-situ crystallization and growth of anatase phase TiO₂ nanospheres by hydrothermal technology. TiO₂ nanospheres were formed on the surface or between layers of the two-dimensional (2D) Ti₃C₂. XRD, SEM, and N₂ adsorption-desorption techniques were used to analyze and characterize the TiO₂/ML-Ti₃C₂ nanocomposite. The photocatalytic performance of pure TiO₂ and TiO2/ML-Ti3C2 nanocomposites with methylene blue (MB) as a simulated pollutant was evaluated. Experimental results show that the coupling of the two materials inhibits the annihilation of photogenerated electron-hole pairs in TiO₂, prolongs the carrier lifetime in the composite photocatalyst, and broadens the spectral response range of the composite material. Under ultraviolet light irradiation, using TiO₂/ML-Ti₃C₂ composite nanomaterials as the photocatalyst, the MB solution of 200 mg/L was almost completely decolorized within 20 min, and the degradation rate was 98.98%. The photocatalytic performance of TiO₂/ML-Ti₃C₂ nanocomposite is better than that of pure TiO₂ and Ti₃C₂. The excellent electron transport capacity and super adsorption performance of Ti₃C₂ optimize the photocatalytic performance of TiO₂. This research provides a new idea for using photocatalytic technology to treat wastewater, which has certain practical application prospects.