关键词: 水热法, 有机污染物, MXene基复合材料, 光催化

Abstract:

In the face of the increasingly serious energy crisis and environmental pollution,it is important to develop durable and efficient photocatalytic materials for hydrogen production from water splitting.The MXene@TiO₂ of high-performance MXene-based photocatalytic materials (M@T) is synthesized by a one-step hydrothermal method at 160 ℃ using Ti₃C₂ as the titanium source and TiO₂@Ti₃C₂ derivatives synthesized by a one-step hydrothermal method.Co-MoS_2-x O _y (C-M) is prepared by sodium molybdate dihydrate (Na₂MoO₄·2H₂O) as molybdenum source,CH₃CSNH₂ as sulfur source,and cobalt nitrate hexahydrate (Co(NO₃)₂?6H₂O) as cobalt source.M@T/C-M composites are prepared at the ratios of m(M@T)/m(C-M) of 1∶1,1∶2,1∶3 and 1∶4.The structure and surface morphology of different composite systems are characterized by XRD,SEM,XPS,UV-vis,etc.At the same time,the photocatalytic degradation of methylene blue (MB),an organic pollutant in water,is tested by using xenon lamp as the light source.The results show that the M@T/C-M composites are successfully synthesized,and the light absorption range is increased to the visible region.The degradation rate of M@T/C-M(1∶3) in 20 mg/L MB solution is as high as 92.6%.The photodegradation of MB by M@T/C-M photocatalyst is mainly driven by ?OH and ?O{}_{\mathrm{2}}^{-} radicals.

Key words: Hydrothermal method, Organic contaminants, MXene matrix composites, Photocatalysis