Li Jianhui, Yang Fan, Zhou Quan, Ren Ruipeng, Wu Lijie, Lv Yongkang
Key Laboratory of Coal Science and Technology (Taiyuan University of Technology), Ministry of Education and Shanxi Province, No. 79 Yingze West Street, Taiyuan 030024, Shanxi, China.
Key Laboratory of Coal Science and Technology (Taiyuan University of Technology), Ministry of Education and Shanxi Province, No. 79 Yingze West Street, Taiyuan 030024, Shanxi, China.
J Colloid Interface Sci. 2019 Jun 15;546:139-151. doi: 10.1016/j.jcis.2019.03.028. Epub 2019 Mar 21.
The magnetic FeO/BiOBr composites with different molar ratios were prepared by a new two-step method. The effect of different FeO contents on composites' properties was detected through XRD, SEM, TEM, HR-TEM, XPS, Uv-vis DRS, PL and BET. When the molar ratio of FeO nanospheres and BiOBr nanosheets is 0.5:1, the two are combined regularly to form 3D flower-like hierarchical heterostructure. This phenomenon is firstly found and can provide a reference for synthesizing other regularly combined magnetic heterostructure catalysts. The degradation activity for Rhodamine B (RhB) is much stronger than that of the previous studies under visible-light irradiation. 3D flower-like FeO/BiOBr (0.5:1) heterostructure possesses great advantages including excellent magnetic separation, remarkable reutilization and stability. Through active species detection and liquid chromatography mass spectrometry (LC-MS) analysis, the degradation mechanisms of RhB are summarized (a) RhB photosensitization and (b) RhB moleculs attacked by radicals and a new possible degradation path was to be presented. This study offers a new method to prepare a regularly combined magnetic FeO/BiOBr photocatalytic material and demonstrates its wonderful application for degradation of organic contaminants in aquatic environment.
采用一种新的两步法制备了不同摩尔比的磁性FeO/BiOBr复合材料。通过XRD、SEM、TEM、HR-TEM、XPS、Uv-vis DRS、PL和BET检测了不同FeO含量对复合材料性能的影响。当FeO纳米球与BiOBr纳米片的摩尔比为0.5:1时，二者规则结合形成三维花状分级异质结构。这一现象首次被发现，可为合成其他规则结合的磁性异质结构催化剂提供参考。在可见光照射下，其对罗丹明B（RhB）的降解活性比以往研究更强。三维花状FeO/BiOBr（0.5:1）异质结构具有优异的磁分离性能、显著的可重复利用性和稳定性等巨大优势。通过活性物种检测和液相色谱-质谱联用（LC-MS）分析，总结了RhB的降解机制：（a）RhB光敏化；（b）RhB分子受到自由基攻击，并提出了一条新的可能降解途径。本研究为制备规则结合的磁性FeO/BiOBr光催化材料提供了一种新方法，并展示了其在降解水环境中有机污染物方面的出色应用。
