Controllable nitridation of Ta2O5 in molten salts for enhanced photocatalysis
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第12期
论文作者：Jing Zhou Dan-dan Nie Xian-bo Jin Wei Xiao
摘 要：Pyrolysis of the Ta2O5/melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitridize and functionalize Ta2O5. The influence of the stoichiometry and composition of Ta2O5/melamine in molten salts on the nitridation process is rationalized to ensure the controllable preparation of Ta3N5 and Ta3N5/Ta ON. 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 Ta3 N5/Ta ON heterojunction, in which the Ta ON nanoparticles are closely anchored to the Ta3 N5 nanorods. Benefiting from its composition and structure, the Ta3N5/Ta ON 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.
Jing Zhou1，Dan-dan Nie2，Xian-bo Jin1，Wei Xiao1
1. College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University2. School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy,Wuhan University
摘 要：Pyrolysis of the Ta2O5/melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitridize and functionalize Ta2O5. The influence of the stoichiometry and composition of Ta2O5/melamine in molten salts on the nitridation process is rationalized to ensure the controllable preparation of Ta3N5 and Ta3N5/Ta ON. 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 Ta3 N5/Ta ON heterojunction, in which the Ta ON nanoparticles are closely anchored to the Ta3 N5 nanorods. Benefiting from its composition and structure, the Ta3N5/Ta ON 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.
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