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A magnetically separable and recyclable Ag-supported magnetic TiO2 composite catalyst: Fabrication, characterization, and photocatalytic activity
Journal of Environmental Management ( IF 8.7 ) Pub Date : 2018-02-22 , DOI: 10.1016/j.jenvman.2018.02.064
Woo Jin Chung , Dinh Duc Nguyen , Xuan Thanh Bui , Sang Woo An , J. Rajesh Banu , Sang Moon Lee , Sung Su Kim , Dea Hyun Moon , Byong Hun Jeon , Soon Woong Chang

In this study, a magnetically separable, highly active, and recyclable photocatalyst was synthesized by physico-chemical incorporation of Ag, TiO2, and Fe3O4 into one structure. The physical and chemical properties of the catalysts were evaluated by X-ray diffraction, X-ray fluorescence spectrometry, scanning electron microscopy, field emission transmission electron microscopy, energy dispersive X-ray spectroscopy, and diffuse reflectance spectroscopy. The Ag-supported magnetic TiO2 composite demonstrated desirable properties and features such as a narrow band gap of 1.163 eV, modifiable structure, and high degradation efficiency. The activity and durability of the synthesized photocatalyst in the degradation of methyl orange (MO) in aqueous solutions under visible light irradiation and different experimental conditions were evaluated and compared to those of commercial TiO2 and Ag/TiO2 composites. It was found that the synthesized composite showed a much higher MO photodegradation efficiency than the other composites under visible light irradiation. Moreover, it exhibited a high photocatalytic activity and was recoverable and durable; its photocatalytic efficiency in MO removal was consistently higher than 93.1% after five reuses without any evident signs of deactivation. Thus, the developed photocatalyst is a very promising material for practical applications in environmental pollution remediation.



中文翻译:

磁性可分离和可循环利用的Ag负载的磁性TiO 2复合催化剂:制备,表征和光催化活性

在这项研究中,通过将Ag,TiO 2和Fe 3 O 4物理化学结合到一个结构中,合成了一种磁性可分离,高活性和可回收的光催化剂。催化剂的物理和化学性质通过X射线衍射,X射线荧光光谱,扫描电子显微镜,场发射透射电子显微镜,能量色散X射线光谱和漫反射光谱进行评估。银载磁性TiO 2复合材料表现出理想的特性和特征,如1.163 eV的窄带隙,可改变的结构和高降解效率。评价了合成光催化剂在可见光和不同实验条件下降解水溶液中甲基橙(MO)的活性和耐久性,并与市售TiO 2和Ag / TiO 2进行了比较。复合材料。发现在可见光照射下,合成的复合材料显示出比其他复合材料高得多的MO光降解效率。而且,它显示出高的光催化活性,并且是可回收的和耐用的。经过五次重复使用后,其去除MO的光催化效率始终高于93.1%,而没有任何明显的失活迹象。因此,开发的光催化剂对于在环境污染修复中的实际应用是非常有前途的材料。

更新日期:2018-02-22
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