Controlled synthesis of Bi2NbO5F plates with exposed {010} facet by molten salt method and their photocatalytic mechanism insights
Controlled synthesis of Bi2NbO5F plates with exposed {010} facet by molten salt method and their photocatalytic mechanism insights
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熔盐法控制合成具有暴露{010}面的Bi2NbO5F板及其光催化机理
DOI：
10.1016/j.jallcom.2018.10.229
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发表时间：
2019-03
影响因子：
6.2
通讯作者：
Gaoke Zhang
中科院分区：
文献类型：
--
作者：
Junting Wang;Jun Li;Kai Wang;Jie Gong;Yuan Li;Gaoke Zhang
虽然制备Aurivillius型氟氧化物作为光催化剂的报道，Bi 2NbO 5 F与暴露的高活性方面的控制合成仍然具有挑战性。在此，纯Bi 2NbO 5 F片已成功地通过一种新的熔盐策略合成。与固相法（BF单键法）制备的Bi 2NbO 5 F相比，熔盐法制备的Bi 2NbO 5 F具有更好的结晶度和纯度。透射电子显微镜（TEM）和选区电子衍射（SAED）结果表明，Bi_2NbO_5F晶体的{010}晶面是主要的晶面。密度泛函理论（DFT）计算表明，Bi 2NbO 5 F晶体属于直接带隙半导体，其{010}晶面是最活跃的晶面，因为它具有最高的表面能。具有高活性{010}晶面的Bi 2NbO 5 F样品对四环素（TC）和罗丹明B（Rh B）的光催化降解活性比具有高活性{010}晶面的Bi 2NbO 5 F样品高。自由基捕获实验证明自由基dotO 2 −、自由基dotOH和h+是主要的活性自由基。具有暴露的{010}面的Bi 2NbO 5 F板即使在四个循环之后仍然具有高的光催化活性。最后提出了Bi 2NbO 5 F纳米片光催化降解污染物的可能机理。
Although the preparation of Aurivillius-type oxyfluoride compounds as photocatalysts has been reported, the control synthesis of Bi2NbO5F with the exposed highly active facets is still challenging. Herein, the pure Bi2NbO5F plates have been successfully synthesized through a novel molten salt strategy. Compared to Bi2NbO5F prepared by solid state method (BFsingle bondS), the Bi2NbO5F obtained by molten salt method revealed better crystallinity and purity. Transmission electron microscope (TEM) and corresponding selected area electron diffraction (SAED) confirm that the main exposed facet of Bi2NbO5F plates is {010} facet. Density functional theory (DFT) calculations indicated Bi2NbO5F crystal belongs to direct-gap semiconductor and its {010} facet was the most active facet due to its highest surface energy. The Bi2NbO5F sample with exposed highly active {010} facet exhibited promoted photocatalytic activity for degradation of tetracyclines (TC) and rhodamine B (RhB) in water as compared to the BFsingle bondS. The free radical capture experiments prove that radical dotO2−, radical dotOH and h+are the main active radicals. The Bi2NbO5F plates with exposed {010} facet still had high photocatalytic activity even after four cycles. Finally, the possible mechanism of Bi2NbO5F nanoplate for photocatalytic degradation of pollutants was proposed.
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