A facile route to the synthesis of magnetically separable BiOBr/NiFe2O4 composites with enhanced photocatalytic performance
A facile route to the synthesis of magnetically separable BiOBr/NiFe2O4 composites with enhanced photocatalytic performance
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一种合成具有增强光催化性能的磁可分离 BiOBr/NiFe2O4 复合材料的简便方法
DOI：
10.1016/j.apsusc.2017.05.013
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发表时间：
2017-10-15
影响因子：
6.7
通讯作者：
Zhuo, Shuping
中科院分区：
文献类型：
--
作者：
Li, Xiaowei;Wang, Li;Zhuo, Shuping
采用水热法制备了不同质量比的新型磁可分离BiOBr/NiFe2O4复合光催化剂。采用x射线衍射（XRD）、能谱（EDS）、x射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和漫反射光谱（DRS）对样品的物相、形貌和光物理性质进行了表征。通过降解亚甲基蓝（MB）和苯酚考察了它们的可见光催化性能。与裸BiOBr和NiFe2O4相比，所有异质结构BiOBr/NiFe2O4纳米复合材料的光催化效率均显著提高。BiOBr/NiFe2O4-20%复合材料的光降解能力最高，分别是单独BiOBr和NiFe2O4的3.2倍和22.4倍。经过5个循环后，BiOBr/NiFe2O4-20%光催化剂对MB染料的降解效率几乎没有变化，表明BiOBr/NiFe2O4-20%光催化剂具有良好的可回收性。此外，BiOBr/NiFe2O4复合光催化剂可以很容易地通过磁铁从污染物溶液中分离并回收，在有机污染物的环境净化和废水处理领域具有很大的应用潜力。根据实验结果，我们提出了一种光催化机制，证实了BiOBr/NiFe2O4复合材料光催化性能的增强主要归因于NiFe2O4纳米棒与BiOBr纳米片之间众所周知的“异质结构效应”所导致的光诱导电荷的有效分离。(C) 2017 Elsevier B.V.版权所有
Novel magnetically separable BiOBr/NiFe2O4 composite photocatalysts with different mass ratios were fabricated through a facile hydrothermal treatment. The phases, morphologies and photophysical properties of the as-obtained samples were characterized by X-ray diffraction (XRD), energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microcopy (TEM) and diffuse reflection spectroscopy (DRS). Their visible light photocatalytic performances were examined by degradation of methylene blue (MB) and phenol. Compared with bare BiOBr and NiFe2O4, all heterostructured BiOBr/NiFe2O4 nanocomposites exhibited significantly enhanced photocatalytic efficiency. The BiOBr/NiFe2O4-20% composite showed the highest photodegradation capacity, which was about 3.2 and 22.4 times greater than that of individual BiOBr and NiFe2O4, respectively. The degradation efficiency of BiOBr/NiFe2O4-20% in the degradation of MB dye hardly changed after five cycles, signifying that the BiOBr/NiFe2O4-20% photocatalyst had excellent recyclability. In addition, BiOBr/NiFe2O4 composite photocatalysts could be easily separated from contaminant solution by using a magnet and recycled, exhibiting great potential for application in the fields of environmental purification of organic pollutants and wastewater treatment. In the light of experimental results, we proposed a"photocatalytic mechanism which confirmed that the enhancement of photocatalytic performance for BiOBr/NiFe2O4 composites was mainly ascribed to the efficient separation of photo-induced charges resulting from the well-known "heterostructure effect" between NiFe2O4 nanorods and BiOBr nanosheets. (C) 2017 Elsevier B.V. All rights reserved.