摘要
Pyrolysis of the Ta_(2)_(O5)/melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitridize and functionalize Ta_(2)_(O5).The influence of the stoichiometry and composition of Ta_(2)_(O5)/melamine in molten salts on the nitridation process is rationalized to ensure the controllable preparation of Ta_(3)N_(5) and Ta_(3)N_(5)/TaON.The characterization results,including scanning electron microscopy,transmission electron microscopy,elemental mapping,X-ray photoelectron spectroscopy,and photoluminescence spectroscopy,all confirm the existence of the Ta_(3)N_(5)/TaON heterojunction,in which the TaON nanoparticles are closely anchored to the Ta_(3)N_(5) nanorods.Benefiting from its composition and structure,the Ta_(3)N_(5)/TaON composites show enhanced photocatalytic activity for the degradation of methylene blue.The present study highlights that the molten salt method using a solid nitrogen source can be a new technique for rationalizing the design of nitrides and oxynitrides.
基金
the National Natural Science Foundation of China(Nos.51722404,51674177,51804221,and 91845113)
the National Key R&D Program of China(No.2018YFE0201703)
the China Postdoctoral Science Foundation(Nos.2018M642906 and 2019T120684)
the Fundamental Research Funds for the Central Universities(No.2042019kf0230)
the Hubei Provincial Natural Science Foundation of China(No.2019CFA065)。
