The Synthesis Of Highly Purified Ti₃alc₂ And The Study Of Its Etching, Delaminating Products's Properties

MXene as a newly explored 2D material family is lack of research in the field of new energy convention,which has been a hot area in recent years,especilly for delaminated Ti₃C₂.It is known that the highly purified raw material Ti₃AlC₂ palys a crutial role on the synthesis of 2D layered Ti₃C₂ MXene.Hence,in this work,the spark splasma sintering system is utilized to synthesize single-phase bulk Ti₃AlC₂ sample.It is found that the optimal sintering condition is at 1300?and keep for 20 min.In this work,the TiOF₂/Ti₃C₂ composites are synthesized by a facile one-step chemical ethching route,directly drying the 40%HF 3h etching products of Ti₃AlC₂ powder after washing into pH⁴ at different temperature under the ambient atmosphere.The XRD pattens reveal that the TiOF₂/Ti₃C₂ composite is successfully gained and the amount of TiOF₂ gradually increases as the drying temperature increase.Deleminated Ti₃C₂ suspension with a concerntration of 2.5 mg/ml is synthesized by a modified method using HCl and LiF as etchant.To form the sandwich-like d-Ti₃C₂/TiO₂/g-C₃N₄ heterostructured nanocomposites,g-C₃N₄ powder and d-Ti₃C₂suspension is mixed in a proper mass ratio,freeze dried and calcined under different temperature for the definite time.It is found that the d-Ti₃C₂/TiO₂/g-C₃N₄ heterojunctions facilitate the visible light harvesting,promote the separation of photoinduced electrons and holes thus improve the photocatalytic H₂ evolution from 0.67mmol/?hg?for pure g-C₃N₄ to 1.62 mmol/?hg?for 4-1-350-1 even after several cycles.It‘s reasonable to believe that the as-synthesized sandwich-like d-Ti₃C₂/TiO₂/g-C₃N₄ heterostructured nanocomposite is a promising 2D-2D nanocomposite for future large-scale photocatalytic applications.