Controllable nitridation of Ta_(2)_(O5) in molten salts for enhanced photocatalysis  

作　　者：Jing Zhou Dan-dan Nie Xian-bo Jin Wei Xiao 

机构地区：[1]College of Chemistry and Molecular Sciences,Hubei Key Laboratory of Eletrochermical Power Sourex,Wuhan Lniversit,wuhan 430072,China [2]Sschool of Resouwce and Einvironmental Sciences,Hubei lnternational Scientifie and Teehnological Cooperation Base of Sustainable Rexource and Energy,Wuhan University,Wuhan 430072,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第12期1703-1710,共8页矿物冶金与材料学报（英文版）

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)。

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.

关 键 词：molten salts PHOTOCATALYSIS Ta_(3)N_(5) TAON HETEROJUNCTION 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]