磁性光催化剂Fe3O4/SiO2/TiO2的制备及光催化降解苯酚

doi:10.16085/j.issn.1000-6613.2017-2696

摘要/Abstract

摘要： 采用撞击流-旋转填料床辅助沉淀法连续制备Fe₃O₄磁性纳米颗粒，然后采用溶胶-凝胶法制备了具有磁性核壳结构Fe₃O₄/SiO₂/TiO₂颗粒，通过傅里叶变换红外光谱（FTIR）、X射线衍射仪（XRD）、透射电子显微镜（TEM）、热重分析仪（TGA）、振动样品磁强计（VSM）和紫外-可见漫反射光谱（UV-vis）等对材料的微观结构、形貌及性能进行了表征。考察了正硅酸乙酯添加量、铁钛比对Fe₃O₄/SiO₂/TiO₂磁性催化剂催化性能的影响。结果表明：制得的Fe₃O₄/SiO₂/TiO₂结晶度好，磁响应性高。当正硅酸乙酯添加量为20mL、铁钛比为1∶8时，制备的Fe₃O₄/SiO₂/TiO₂纳米光催化剂表现出较高的光催化活性和磁性能，紫外光照射2h后，苯酚水溶液降解效率高达86.7%。

关键词: 撞击流-旋转填料床, 磁性光催化剂, 降解, 苯酚, 废水

Abstract: Impinging stream-rotating packed bed auxiliary precipitation method was used for the continuous preparation of magnetic Fe₃O₄ nanoparticles, and then the Fe₃O₄/SiO₂/TiO₂ composite particles with magnetic core-shell structure were synthesized by sol-gel method. The microstructures, morphology and properties of the obtained materials were characterized by Fourier infrared spectrum(FTIR), X-ray diffraction(XRD), transmission electron microscopes (TEM), thermogravimetric analysis(TGA), vibrating sample magnetometer(VSM), ultraviolet visible light diffuse reflectance spectra(UV-vis), and some other technologies. The effects of the ferroferric-to-tetrabutyl titanate molar ratio, and the dosage of the tetraethoxysilane on the catalytic performance of Fe₃O₄/SiO₂/TiO₂ magnetic photocatalyst were investigated. The results confirmed that the well-designed photocatalyst exhibited a high crystallinity and high magnetic response. The Fe₃O₄/SiO₂/TiO₂ nano-photocatalysts with the dosage of the tetraethoxysilane of 20mL and the molar ratio of ferroferric to tetrebutyl titanate of 1:8 exhibited the best photocatalytic activity and magnetic performance, and the phenol degradation efficiency reached 86.7% after 2 hours UV irradiation.

Key words: impingping stream-rotating packed bed (IS-RPB), magnetic photocatalyst, degradation, phenol, wastewater

中图分类号:

O643

师艳婷, 乔生莉, 张巧玲, 刘有智, 畅俊波, 秦钊. 磁性光催化剂Fe₃O₄/SiO₂/TiO₂的制备及光催化降解苯酚[J]. 化工进展, 2018, 37(11): 4322-4329.

SHI Yanting, QIAO Shengli, ZHANG Qiaoling, LIU Youzhi, CHANG Junbo, QIN Zhao. Preparation of Fe₃O₄/SiO₂/TiO₂ magnetic photocatalyst and the photocatalytic degradation of phenol[J]. Chemical Industry and Engineering Progress, 2018, 37(11): 4322-4329.

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磁性光催化剂Fe₃O₄/SiO₂/TiO₂的制备及光催化降解苯酚

Preparation of Fe₃O₄/SiO₂/TiO₂ magnetic photocatalyst and the photocatalytic degradation of phenol

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