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Controllable nitridation of Ta 2 O 5 in molten salts for enhanced photocatalysis
International Journal of Minerals, Metallurgy and Materials ( IF 5.6 ) Pub Date : 2020-12-30 , DOI: 10.1007/s12613-020-2050-z
Jing Zhou , Dan-dan Nie , Xian-bo Jin , Wei Xiao

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/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 Ta3N5/TaON heterojunction, in which the TaON nanoparticles are closely anchored to the Ta3N5 nanorods. Benefiting from its composition and structure, the Ta3N5/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.



中文翻译:

熔融盐中Ta 2 O 5的可控氮化以增强光催化作用

Ta 2 O 5 /三聚氰胺混合物在熔融氯化物中的热解在本文中被证明是氮化和功能化Ta 2 O 5的简便且可控制的方法。合理设计了熔盐中Ta 2 O 5 /三聚氰胺的化学计量和组成对氮化过程的影响,以确保可控地制备Ta 3 N 5和Ta 3 N 5 / TaON。扫描电子显微镜,透射电子显微镜,元素图谱,X射线光电子能谱和光致发光光谱等表征结果均证实了Ta的存在3 N 5 / TaON异质结,其中TaON纳米颗粒紧密锚定到Ta 3 N 5纳米棒上。Ta 3 N 5 / TaON复合材料得益于其组成和结构,对亚甲基蓝的降解显示出增强的光催化活性。本研究强调,使用固态氮源的熔盐方法可以成为合理设计氮化物和氮氧化物的一种新技术。

更新日期:2020-12-30
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