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Controllable nitridation of Ta2O5 in molten salts for enhanced photocatalysis

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  • Received: 27 February 2020Revised: 20 March 2020Accepted: 24 March 2020Available online: 26 March 2020
  • Pyrolysis of the Ta2O5/melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitride and functionalize the Ta2O5. The influence of Ta2O5/melamine stoichiometry and composition of molten salts on the nitridation process is rationalized for controllable preparation of Ta3N5 and Ta3N5/TaON. The characterization results including scanning electron microscope (SEM), transmission electron microscopy (TEM), elements mapping and X-ray photoelectron spectroscopy (XPS) as well as photoluminescence spectra all confirm the existence of heterojunction in the Ta3N5/TaON, in which the TaON nanoparticles are closely anchored to the Ta3N5 nanorods. Benefiting from the merits in composition and structure, the Ta3N5/TaON composites show an enhanced photocatalytic activity for degradation of methylene blue. The present study highlights that the molten salt method using a solid nitrogen source can be a new way to the rational design of nitrides and oxynitrides.
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Controllable nitridation of Ta2O5 in molten salts for enhanced photocatalysis

  • Corresponding author:

    Wei Xiao    E-mail: 00030042@whu.edu.cn

  • 1. College of Chemistry and Molecular Sciences, Hubei Key Laboratory of Electrochemical Power Sources, Wuhan University, Wuhan 430072, China
  • 2. School of Resource and Environmental Sciences, Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and Energy, Wuhan University, Wuhan 430072, China

Abstract: Pyrolysis of the Ta2O5/melamine mixture in molten chlorides is herein demonstrated as a facile and controllable method to nitride and functionalize the Ta2O5. The influence of Ta2O5/melamine stoichiometry and composition of molten salts on the nitridation process is rationalized for controllable preparation of Ta3N5 and Ta3N5/TaON. The characterization results including scanning electron microscope (SEM), transmission electron microscopy (TEM), elements mapping and X-ray photoelectron spectroscopy (XPS) as well as photoluminescence spectra all confirm the existence of heterojunction in the Ta3N5/TaON, in which the TaON nanoparticles are closely anchored to the Ta3N5 nanorods. Benefiting from the merits in composition and structure, the Ta3N5/TaON composites show an enhanced photocatalytic activity for degradation of methylene blue. The present study highlights that the molten salt method using a solid nitrogen source can be a new way to the rational design of nitrides and oxynitrides.

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