Preparation and photocatalytic performance of magnetic Fe3O4@TiO2 core-shell microspheres supported by silica aerogels from industrial fly ash
Preparation and photocatalytic performance of magnetic Fe3O4@TiO2 core-shell microspheres supported by silica aerogels from industrial fly ash
复制标题
工业粉煤灰二氧化硅气凝胶负载磁性Fe3O4@TiO2核壳微球的制备及其光催化性能
DOI：
10.1016/j.jallcom.2015.10.297
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发表时间：
2016-02-25
影响因子：
6.2
通讯作者：
Jiang, Wen-Feng
中科院分区：
文献类型：
--
作者：
Li, Zhen-Duo;Wang, Hui-Long;Jiang, Wen-Feng
本文以工业飞灰中的Fe3O4@TiO2核壳微球和SiO_2气凝胶为原料，采用溶胶-凝胶和简单水热相结合的方法，成功制备了具有良好光催化活性的Fe_3O_4@TiO_2/SiO_2气凝胶三元磁性复合材料。用粉末X射线衍射仪(XRD)、傅里叶变换红外光谱(FT-IR)、透射电子显微镜(TEM)、氮气吸附-脱附(N-2)、紫外-可见漫反射光谱(UV-Vis/DRS)和振动样品磁强计(VSM)研究了Fe3O4@TiO2/SiO_2气凝胶复合材料的结构和磁性。结果表明，Fe3O4@TiO2核壳微球分散在SiO_2气凝胶表面。Fe3O4@TiO2/SiO_2气凝胶复合材料具有优异的室温磁性能、对有机污染物的高吸附能力、高的电荷分离效率和在可见光范围内的强吸光能力。通过改变pH值、催化剂浓度、光照时间、底物初始浓度等操作参数，系统研究了Fe3O4@TiO2/SiO_2气凝胶在可见光照射下对罗丹明B降解的光催化活性，光催化反应符合Langmuir-HinShelwood模型的准一级动力学。并对光催化活性的重复性进行了测试。与纯的二氧化钛和Fe3O4@二氧化钛核壳微球相比，三元复合的Fe3O4@二氧化钛/二氧化硅气凝胶对罗丹明B的降解表现出更高的光催化活性，这意味着该材料可以作为一种高效的、可回收的多功能光催化剂来降解废水中的有害有机染料。(C)2015爱思唯尔B.V.保留所有权利。
In this work, a ternary magnetic composite of Fe3O4@TiO2/SiO2 aerogel with good photocatalytic activity was prepared successfully by combining sol-gel and simple hydrothermal methods with Fe3O4@TiO2 core-shell microspheres and SiO2 aerogels from industrial fly ash as starting materials. The structural and magnetic features of the as-obtained Fe3O4@TiO2/SiO2 aerogel composite were investigated by powder X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR), transmission electron microscopy (TEM), N-2 adsorption-desorption measurements, UV-vis diffuse reflectance spectra (UV-vis/DRS) and vibrating sample magnetometry (VSM). The results showed that Fe3O4@TiO2 core-shell microspheres were dispersed on the surface of SiO2 aerogels. The Fe3O4@TiO2/SiO2 aerogel composite material possessed excellent magnetic properties at room temperature, high adsorption capacity to organic pollutants, enhanced charge separation efficiency and strong light absorption in the visible region. The photocatalytic activity of the prepared Fe3O4@TiO2/SiO2 aerogel for Rhodamine B degradation under visible light irradiation was systematically investigated by varying the operational parameters such as pH value, catalyst concentration, irradiation time, and initial substrate concentration, etc. The photocatalytic reactions obeyed pseudo-first-order kinetics according to Langmuir-Hinshelwood model. The repeatability of photocatalytic activity was also tested. Compared to pure TiO2 and Fe3O4@TiO2 core-shell microspheres, the ternary composite of Fe3O4@TiO2/SiO2 aerogel showed higher photocatalytic activity for Rhodamine B degradation, which meant that this material can serve as an efficient and recyclable multifunctional photocatalyst for the degradation of hazardous organic dyes in wastewater. (C) 2015 Elsevier B.V. All rights reserved.