采用微波辅助法制备 BiF/BiOBr 异质结及其光催化性能。
Preparation of BiF/BiOBr heterojunctions from microwave-assisted method and photocatalytic performances.
机构信息
College of Science, Tianjin University of Science & Technology, Tianjin, 300457, PR China; College of Basic Sciences, Tianjin Agricultural University, Tianjin, 300384, PR China.
College of Chemical Engineering and Materials Science, Tianjin University of Science & Technology, Tianjin, 300457, PR China.
出版信息
J Hazard Mater. 2019 Apr 5;367:304-315. doi: 10.1016/j.jhazmat.2018.12.060. Epub 2018 Dec 18.
Novel BiF/BiOBr heterojunction photocatalysts were prepared from a fast and stable microwave-assisted method, and characterized by X-ray diffractometry, X-ray photoelectron spectroscopy, scanning electron microscopy, ultraviolet-visible spectroscopy and fluorescence spectroscopy. The photocatalytic activity of BiF/BiOBr heterojunctions under light irradiation was significantly higher than pure BiOBr or BiF, and was maximized at the Br:F molar ratio of 1:1, as the targeted 20 mg/L Rhodamine B (RhB) solution was completely degraded within 40 min. This was mainly because the unique BiF/BiOBr heterojunction formed during photocatalytic degradation accelerated the photoelectron and hole separation, effectively enhanced the quantum efficiency, and thereby strengthened the photocatalytic activity.
新型 BiF/BiOBr 异质结光催化剂采用快速稳定的微波辅助法制备，并通过 X 射线衍射仪、X 射线光电子能谱、扫描电子显微镜、紫外-可见分光光度计和荧光分光光度计进行了表征。在光照下，BiF/BiOBr 异质结的光催化活性明显高于纯 BiOBr 或 BiF，在 Br:F 摩尔比为 1:1 时达到最大值，目标浓度为 20mg/L 的 Rhodamine B（RhB）溶液在 40 分钟内完全降解。这主要是因为在光催化降解过程中形成的独特的 BiF/BiOBr 异质结加速了光电子和空穴的分离，有效提高了量子效率，从而增强了光催化活性。
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