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首页> 外文期刊>Journal of the Brazilian Chemical Society >Photophysical and photocatalytic properties of novel M2BiNbO7 (M = In and Ga)
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Photophysical and photocatalytic properties of novel M2BiNbO7 (M = In and Ga)

机译：新型M2BiNbO7（M = In和Ga）的光物理和光催化特性

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摘要

M2BiNbO7 ( M = In and Ga) were synthesized by solid- state reaction method and their structural and photocatalytic properties were investigated. The results indicated that these compounds crystallize in the pyrochlore-type structure, cubic system with space group Fd-3m. In addition, the band gaps of In2BiNbO7 and Ga2BiNbO7 were estimated to be about 2.52( 5) and 2.57( 8) eV, respectively. For the photocatalytic water splitting reaction, H-2 or O-2 evolution was observed from pure water respectively with M2BiNbO7 ( M = In and Ga) as the photocatalysts under ultraviolet light irradiation. Photocatalytic degradation of aqueous methylene blue ( MB) dye over these compounds was further investigated under visible light irradiation. M2BiNbO7 ( M = In and Ga) showed markedly higher catalytic activity compared to P-25 for MB photocatalytic degradation under visible light irradiation. Complete removal of aqueous MB was observed after visible light irradiation for 160 min with the Ga2BiNbO7 as the photocatalyst and for 180 min with the In2BiNbO7 as the photocatalyst. The decrease of the total organic carbon ( TOC) and the formation of inorganic products, SO42- and NO3-, demonstrated the continuous mineralization of aqueous MB during the photocatalytic process.
机译：通过固相反应法合成了M2BiNbO7（M = In和Ga），研究了其结构和光催化性能。结果表明，这些化合物以烧绿石型结构，立方晶系，空间群Fd-3m结晶。另外，In 2 BiNbO 7和Ga 2 BiNbO 7的带隙估计分别为约2.52（5）和2.57（8）eV。对于光催化水分解反应，在紫外线照射下，分别以M2BiNbO7（M = In和Ga）作为光催化剂，从纯水中观察到H-2或O-2析出。在可见光照射下，进一步研究了这些化合物上亚甲基蓝（MB）水溶液的光催化降解。与P-25相比，M2BiNbO7（M = In和Ga）在可见光照射下对MB光催化降解具有明显更高的催化活性。用Ga2BiNbO7作为光催化剂照射可见光160分钟，用In2BiNbO7作为光催化剂照射180分钟后，观察到MB水的完全去除。总有机碳（TOC）的减少以及无机产物SO42-和NO3-的形成表明在光催化过程中MB水溶液连续矿化。

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