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具有卓越可见光光催化活性的新型可回收BiOBr/FeO/RGO复合材料。

Novel recyclable BiOBr/FeO/RGO composites with remarkable visible-light photocatalytic activity.

作者信息

Zheng Mingkun, Ma Xinguo, Hu Jisong, Zhang Xinxin, Li Di, Duan Wangyang

机构信息

School of Science and Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy, Hubei University of Technology Wuhan 430068 China

Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology Wuhan 430074 China

出版信息

RSC Adv. 2020 May 27;10(34):19961-19973. doi: 10.1039/d0ra01668c. eCollection 2020 May 26.

DOI:10.1039/d0ra01668c
PMID:35520430
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9054123/
Abstract

Magnetic BiOBr/FeO/RGO composites with remarkable photocatalytic capability were prepared by a simple hydrothermal method to load 3D flower-like microspherical BiOBr onto the surface of FeO/RGO. Under visible-light irradiation ( > 420 nm), the BiOBr/FeO/RGO composite with 56% mass percentage of FeO/RGO shows the optimal removal ability for Rhodamine B, and the total removal efficiency is 96%. The coupling of FeO/RGO and BiOBr elevates the conduction band of BiOBr, which enhances the reduction level of BiOBr/FeO/RGO composites. Ultimately, based on experiments and theoretical calculations, an n-type Schottky contact formed at the heterojunction interface between RGO doped with FeO and BiOBr is proposed for photoexcited charge transfer. The RGO with great adsorptivity plays a major role in the photocatalysts composed of BiOBr, RGO and FeO. Further, BiOBr/FeO/RGO composites with permanent-magnetism can be recovered and reused easily by external magnetic field and maintain a total removal efficiency of 90% after four cycles.

摘要

通过一种简单的水热法制备了具有显著光催化能力的磁性BiOBr/FeO/RGO复合材料，将三维花状微球形BiOBr负载到FeO/RGO表面。在可见光照射（>420 nm）下，FeO/RGO质量百分比为56%的BiOBr/FeO/RGO复合材料对罗丹明B具有最佳去除能力，总去除效率为96%。FeO/RGO与BiOBr的耦合提高了BiOBr的导带，增强了BiOBr/FeO/RGO复合材料的还原能力。最终，基于实验和理论计算，提出在掺杂FeO的RGO与BiOBr之间的异质结界面形成n型肖特基接触用于光激发电荷转移。具有高吸附性的RGO在由BiOBr、RGO和FeO组成的光催化剂中起主要作用。此外，具有永久磁性的BiOBr/FeO/RGO复合材料可通过外部磁场轻松回收和再利用，并且在四个循环后总去除效率保持在90%。

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