Ag@AgBr/Bi2Fe4O9的制备及光催化性能的研究
1. 石家庄学院, 化工学院河北省石家庄市低碳能源材料重点实验室, 河北石家庄 050035
2. 华北理工大学, 化工学院, 河北唐山 063210
| 摘 要： | 本文利用水热法和原位沉积－光致还原法合成不同修饰量的Ag@AgBr/Bi2Fe4O9复合光催化剂，利用SEM等仪器对催化剂的表面形貌进行了表征，发现该复合光催化剂中二者贴合紧密，具有较大的接触面积，可以有效地增加反应效率；我们利用对亚甲基蓝（MB）溶液的降解效率来分析催化剂的光催化活性。结果表明，当Ag@AgBr的负载量为20%时，Ag@AgBr/Bi2Fe4O9在可见光下2.5 h内对亚甲基蓝溶液的降解效率可高达91.61%。20% Ag@AgBr/Bi2Fe4O9的降解率比Ag@AgBr提升了2.98倍，比Bi2Fe4O9提升了7.85倍。之后我们对修适量为20%的复合光催化剂进行循环实验，发现其降解效果并没有显著下降。具有较优的稳定性能；对该复合光催化剂进行淬灭实验，结果表明，用该复合光催化剂降解主要的反应物质是•OH；现在光催化降解仍有一定的局限性，但是复合光催化剂的出现扩大了卓越性能光催化剂的选择范围，具有潜在的发展空间，对于国内外矿产资源合理开采利用和解决能源、环境问题具有重要意义，值得我们深入探索。 |
| 关 键 词： | Ag@AgBr/Bi2Fe4O9; 复合光催化剂; 光催化降解; 水热法 |
| DOI： | 10.57237/j.cse.2023.02.002 |
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收稿日期: 2023-05-23
接受日期: 2023-06-25
在线出版日期: 2023-06-29
Preparation of Ag@AgBr/Bi2Fe4O9 and Study of Photocatalytic Performance
1. School of Chemical Engineering, Key Laboratory of Low-carbon Energy Materials, Shijiazhuang University, Shijiazhuang 050035, China
2. School of Chemical Engineering, North China University of Science and Technology, Tangshan 063210, China
| Abstract: | In this paper, the Ag@AgBr/Bi2Fe4O9 composite photocatalyst with different modified amounts was synthesized by hydrothermal method and in situ deposition-photoreduction method, and the surface morphology of the catalyst was characterized by SEM and other instruments, and it was found that the two composite photocatalysts were closely bonded and had a large contact area, which could effectively increase the reaction efficiency. We used the degradation efficiency of methylene blue (MB) solutions to analyze the photocatalytic activity of the catalyst. The results show that when the loading of Ag@AgBr is 20%, the degradation efficiency of Ag@AgBr/Bi2Fe4O9 on methylene blue solution within 2.5 h under visible light can be as high as 91.61%. The degradation rate of 20% Ag@AgBr/Bi2Fe4O9 was 2.98 times higher than Ag@AgBr and 7.85 times higher than that of Bi2Fe4O9. After that, we carried out cycling experiments on the composite photocatalyst with an appropriate amount of 20%, and found that its degradation effect did not decrease significantly. It has better stable performance; The quenching experiment of the composite photocatalyst showed that the main reaction substances degraded by the composite photocatalyst were • OH; At present, photocatalytic degradation still has certain limitations, but the emergence of composite photocatalysts has expanded the selection range of photocatalysts with excellent performance, has potential development space, and is of great significance for the rational exploitation and utilization of mineral resources at home and abroad and solving energy and environmental problems, which is worthy of our in-depth exploration. |
| Keywords: | Ag@AgBr/Bi2Fe4O9; Coupled Photocatalyst; Photocatalytic Degradation; Hydrothermal Method |
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