Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water
Preparation and characterization of magnetic TiO2 nanoparticles and their utilization for the degradation of emerging pollutants in water
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DOI：
10.1016/j.apcatb.2010.08.010
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发表时间：
2010-10-11
影响因子：
22.1
通讯作者：
Plucinski, Pawel K.
中科院分区：
文献类型：
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作者：
Alvarez, Pedro M.;Jaramillo, Josefa;Plucinski, Pawel K.
以商品化的纳米磁性氧化铁为载体，采用超声波辅助溶胶-凝胶法制备了磁性TiO 2/Fe 3 O 4和TiO 2/SiO2/Fe 3 O 4纳米粒子（NPs）。采用X射线衍射（XRD）、透射电子显微镜（TEM）、氮吸附（BET比表面积）和SQUID磁强计对磁性纳米粒子进行了表征。结构分析表明，TiO 2/Fe 3 O 4纳米粒子呈核壳结构，磁性氧化铁表面包覆有TiO 2（SiO2）涂层。TiO 2/SiO2/Fe 3 O 4纳米颗粒具有Fe 3 O 4核、SiO2中间层和TiO 2（SiO2）壳的三元结构。这两种类型的纳米粒子表现出的磁性能与饱和磁化强度约40 emu/g和低的剩磁和矫顽力。TiO 2/SiO2/Fe 3 O 4纳米颗粒在紫外光照射下的水溶液中的稳定性优于TiO 2/Fe 3 O 4纳米颗粒，因为绝缘SiO2层的存在防止了铁的光溶解。这两种催化剂都显示出催化对乙酰氨基酚和其他四种药物和个人护理产品（PPCP）（安替比林，咖啡因，美托洛尔和双酚A）从水溶液中光降解的能力。在催化活性方面，合成的磁性纳米颗粒几乎与商业Degussa P25 TiO 2光催化剂相当。此外，易于回收的磁性光催化剂显示出良好的可重复使用性，特别是在TiO 2/SiO2/Fe 3 O 4纳米颗粒的情况下。(C)2010 Elsevier BV保留所有权利。
Magnetic TiO2/Fe3O4 and TiO2/SiO2/Fe3O4 nanoparticles (NPs) were prepared by an ultrasonic-assisted sol-gel method using a commercial nanosized magnetic iron oxide as a support. Magnetic NPs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption (BET surface area) and SQUID magnetometer. Structure analyses indicated that TiO2/Fe3O4 NPs presented a core-shell structure with a TiO2 (anatase) coating wrapped around the magnetic iron oxide surface. TiO2/SiO2/Fe3O4 NPs showed a ternary structure with a core of Fe3O4, a SiO2 mesosphere and a TiO2 (anatase) crust. Both types of NPs exhibited magnetic properties with saturation magnetization about 40 emu/g and low remanent magnetization and coercivity. Stability of TiO2/SiO2/Fe3O4 NPs in an aqueous solution under UV illumination was better than that of TiO2/Fe3O4 NPs as the presence of the insulation SiO2 layer prevented photodissolution of iron. Both catalysts showed the ability to catalyze the photodegradation of acetaminophen and other four pharmaceutical and personal care products (PPCPs) (antipyrine, caffeine, metoprolol and bisphenol A) from an aqueous solution. In terms of catalytic activity the synthesized magnetic NPs were almost comparable to the commercial Degussa P25 TiO2 photocatalyst. In addition, the easily recoverable magnetic photocatalysts showed good reusability, especially in the case of TiO2/SiO2/Fe3O4 NPs. (C) 2010 Elsevier B.V. All rights reserved.