MXene@TiO_(2)@Fe_(3)O_(4)三元复合材料的制备及其光催化性能

Preparation and Photocatalytic Performance of MXene@TiO_(2)@Fe_(3)O_(4)Ternary Composite Materials

Ti3C2Tx作为二维MXene材料,由于其特殊的层状结构及优异的电导特性,成为目前光电能源领域研究的热点。尤其MXene作为助催化剂,对半导体材料的光催化反应活性具有显著的协同催化效应。以MXene材料为前驱体,通过水热法构筑MXene@TiO_(2)@Fe_(3)O_(4)三元异质结构。与单一MXene和其二元复合材料相比,MXene@TiO_(2)@Fe_(3)O_(4)三元复合材料的光催化性能明显增强。最大光电流密度可达3.9μA/cm^(2),分别是单一MXene、MXene@TiO_(2)和MXene@Fe_(3)O_(4)的15倍、2.6倍和1.6倍。在可见光照射2 h内,MXene@TiO_(2)@Fe_(3)O_(4)复合材料对罗丹明B(RhB)的降解率可达99%,分别是单一MXene、MXene@TiO_(2)和MXene@Fe_(3)O_(4)的3.4倍、2.1倍和1.26倍。实验结果表明,由于MXene优异的电导特性和多元异质结构,使MXene成为电子俘获中心,有效抑制了光生电子-空穴对的复合。因此,高浓度的光生载流子有效增强了光催化氧化还原反应。本研究为新型复合光催化材料的设计提供依据,拓宽基于MXene材料在能源和绿色生态等领域的应用。

As two-dimensional MXene material,Ti3C2Tx has become a research focus in the field of photoelectricity energy due to its unique layered structure and excellent conductivity properties.Especially as the co-catalyst,MXene possesses a significant synergistic effect in the photocatalytic activity for semiconductor materials.With MXene as the precursor,hydrothermal method was used to prepare MXene@TiO_(2)@Fe_(3)O_(4)ternary hetero-structure.Compared with the single MXene and its corresponding binary composite,the photocatalytic activity of MXene@TiO_(2)@Fe_(3)O_(4)ternary composite is significantly enhanced.The maximum photocurrent density can reach to 3.9μA/cm^(2),which is 15 times,2.6 times,and 1.6 times of those of single MXene,MXene@TiO_(2)and MXene@Fe_(3)O_(4),respectively.Under the irradiation of visible light for 2 h,the photo-degradation efficiency of MXene@TiO_(2)@Fe_(3)O_(4)ternary composite to rhodamine B(RhB)is 99%,which is 3.4 times,2.1 times,and 1.26 times of those of single MXene,MXene@TiO_(2)and MXene@Fe_(3)O_(4),respectively.The experiment results show that MXene becomes the electron capture center due to its excellent conductivity and multi-component hetero-structure,which effectively inhibits the recombination of photo-generated electron and hole pairs.Therefore,the high concentration of photo-generated carriers effectively enhances the photocatalytic redox reaction.The study provides a basis for the design of new photocatalytic materials and expands the application of MXene-based materials in the fields of energy and green ecology.