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三元磁性FeO/BiOBr/BiOI复合材料的可见光光催化性能、回收及降解机理

Visible-light photocatalytic performance, recovery and degradation mechanism of ternary magnetic FeO/BiOBr/BiOI composite.

作者信息

Li Jianhui, Yang Fan, Zhou Quan, Wu Lijie, Li Wenying, Ren Ruipeng, Lv Yongkang

机构信息

Key Laboratory of Coal Science and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology No. 79 Yingze West Street Taiyuan 030024 China

出版信息

RSC Adv. 2019 Jul 30;9(41):23545-23553. doi: 10.1039/c9ra04412d. eCollection 2019 Jul 29.

DOI:10.1039/c9ra04412d
PMID:35530612
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9073387/
Abstract

The ternary magnetic FeO/BiOBr/BiOI ( : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method. The samples were characterized by XRD, SEM, EDS, ICP-AES, XPS, UV-vis DRS, PL and VSM. Nitrogen-containing dye RhB was used as a degradation substrate to evaluate the photocatalytic degradation activities of the samples. The photocatalytic performance of FeO/BiOBr/BiOI (0.4 : 3 : 1) is superior to other FeO/BiOBr/BiOI ( : 3 : 1). Compared with binary magnetic FeO/BiOBr (0.5 : 1) prepared in our previous work, the FeO/BiOBr/BiOI (0.4 : 3 : 1) has obvious advantages in photocatalytic activity and adsorption capacity. And the specific surface area (48.30 m g) is much larger than that of the previous report (FeO/BiOBr/BiOI (0.5 : 2 : 2)) synthesized by a co-precipitation method. Besides, after 25 s of magnetic field, FeO/BiOBr/BiOI (0.4 : 3 : 1) can be rapidly separated from water. After eight recycling cycles, the magnetic properties, photocatalytic activity, crystallization and morphology of the FeO/BiOBr/BiOI (0.4 : 3 : 1) catalyst remain good. The possible photocatalytic degradation mechanism of RhB under FeO/BiOBr/BiOI (0.4 : 3 : 1) photocatalyst was also proposed. The results indicate that the ternary magnetic FeO/BiOBr/BiOI (0.4 : 3 : 1) composite with high photocatalytic degradation efficiency, good magnetic separation performance and excellent recyclability and stability has potential application prospect in wastewater.

摘要

通过简便的溶剂热法成功合成了三元磁性FeO/BiOBr/BiOI（：3：1）光催化剂。采用XRD、SEM、EDS、ICP-AES、XPS、UV-vis DRS、PL和VSM对样品进行了表征。以含氮染料RhB作为降解底物来评估样品的光催化降解活性。FeO/BiOBr/BiOI（0.4：3：1）的光催化性能优于其他FeO/BiOBr/BiOI（：3：1）。与我们之前工作中制备的二元磁性FeO/BiOBr（0.5：1）相比，FeO/BiOBr/BiOI（0.4：3：1）在光催化活性和吸附容量方面具有明显优势。并且其比表面积（48.30 m g）远大于之前通过共沉淀法合成的报道（FeO/BiOBr/BiOI（0.5：2：2））。此外，在施加25 s磁场后，FeO/BiOBr/BiOI（0.4：3：1）能够迅速从水中分离。经过八次循环后，FeO/BiOBr/BiOI（0.4：3：1）催化剂的磁性、光催化活性、结晶度和形貌仍保持良好。还提出了FeO/BiOBr/BiOI（0.4：3：1）光催化剂作用下RhB可能的光催化降解机理。结果表明，具有高光催化降解效率、良好磁分离性能以及优异可回收性和稳定性的三元磁性FeO/BiOBr/BiOI（0.4：3：1）复合材料在废水处理方面具有潜在的应用前景。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7be4/9073387/f40702995c2c/c9ra04412d-f10.jpg
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