Abstract
A series of novel Bi2MoO6/zeolitic imidazolate framework-8 (ZIF-8) photocatalysts have been successfully fabricated through a facile self-assembly process. X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis spectrophotometry, and X-ray photoelectron spectroscopy (XPS) characterized pure Bi2MoO6, pure ZIF-8, and a series of Bi2MoO6/ZIF-8 composites. The result indicated that, when compared with pure Bi2MoO6, the composite of Bi2MoO6/ZIF-8 exhibited excellent photocatalytic performance for the degradation of methylene blue (MB) under visible light. Moreover, the Bi2MoO6/ZIF-8-3 composite (the molar ratio of Bi2MoO6 to 2-MI is 3:3) has optimum photocatalytic performance because of the suitable amount of ZIF-8 decorated on the flower-like Bi2MoO6. The enhanced photocatalytic activity is probably due to the introduction of ZIF-8, which will promote the separation of electron–hole pair and the surface morphology. Benefitting from the diversity of the MOF species (ZIF-8 is one of them), this composing strategy of Bi2MoO6/MOF composite would provide new insight into the design of highly efficient visible light photocatalysts.
Highlights
Photocatalytic materials, especially semiconductor photocatalysts, have attracted a lot of attention in recent years due to the world-wide environmental problems, such as the water pollution [1,2,3]
Bi2MoO6 has a variety of morphologies that have been synthesized [7,8], among which the hierarchical flower-like Bi2MoO6 spheres have attracted a lot of attention with their super photocatalytic performance
These results indicated that zeolitic imidazolate framework-8 (ZIF-8) based materials have potential applications in the field of photocatalysis
Summary
Photocatalytic materials, especially semiconductor photocatalysts, have attracted a lot of attention in recent years due to the world-wide environmental problems, such as the water pollution [1,2,3]. When compared with the titanium dioxide, the Bi2MoO6 has a smaller forbidden band width (about 2.7 eV) As a result, it has a better photocatalytic activity within the visible range [5]. Zeng et al synthesized the TiO2/ZIF-8 composite, which effectively inhibits the recombination of charge carrier, resulting in an improved photocatalytic activity [18]. Y.H. Ding et al reported that Bi2S3@ZIF-8 core–shell heterostructures exhibited photocatalytic activity to Rhodamine B (RhB) dye degradation under visible light [19]. Ding et al reported that Bi2S3@ZIF-8 core–shell heterostructures exhibited photocatalytic activity to Rhodamine B (RhB) dye degradation under visible light [19] These results indicated that ZIF-8 based materials have potential applications in the field of photocatalysis. The result shows that the Bi2MoO6/ZIF-8 composite has excellent photocatalytic performance under visible light
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