Synthesis And Performance Of MXenes-based Composites

Efficient utilization of solar energy is highly desirable in the field of photocatalysis.However,the near-infrared part of the solar spectrum,which constitutes about 44%of sunlight,has rarely been used.Herein,we report that the TiO₂ coupled with MXene Ti₃C₂ nanosheets shows promising photoactivity for ethylene oxidation under near infrared light?NIR?irradiation.Moreover,the Pt nanoparticles decoration can dramatically improve the performance of Ti O₂-Ti₃C₂ nanocomposites.Within 15 minutes irradiation of the NIR light,444 ppm of C₂H₄ is completely removed over 1wt%Pt-TiO₂-Ti₃C₂ and the catalyst exhibits excellent stability.It is expected that our work could provide useful information for the design and synthesis of efficient and stable NIR active photocatalyst for target applications.1.Ti₃C₂:Ti₃C₂ was obtained by etching Al of Ti₃AlC₂.SEM and TEM images show that the Ti₃C₂formed layered structure.2.Pt-TiO₂-Ti₃C₂ composite:The TiO₂-Ti₃C₂ nanocomposite was prepared by using the same procedure as the Ti₃C₂ excepting that the reaction temperature.Pt-TiO₂-Ti₃C₂ nanocomposites are further prepared by treating the mixture of TiO₂-Ti₃C₂ and H₂PtCl₆ under H₂ atmosphere.SEM,TEM,XRD and XPS was used to characterize the morphology and structure of this material.Results show that the TiO₂ and Pt NPs grown on surface of the Ti₃C₂.The performance of the samples is investigated by photocatalytic oxidation of ethylene under near infrared?NIR?light irradiation.In particular,the 1wt%Pt-TiO₂-Ti₃C₂composite shows the best photoactivity among the Pt-TiO₂-Ti₃C₂ composites.Within 15 min,444 ppm of C₂H₄ was completely removed under NIR light irradiation.More importantly,1wt%Pt-TiO₂-Ti₃C₂composite shows better catalytic performance than that of 1wt%Pt-Ti₃C₂.