光催化
降级(电信)
纳米颗粒
材料科学
磁性纳米粒子
化学工程
纳米技术
催化作用
化学
有机化学
计算机科学
电信
工程类
作者
Rajesh Chalasani,S. Vasudevan
出处
期刊:ACS Nano
[American Chemical Society]
日期:2013-05-01
卷期号:7 (5): 4093-4104
被引量:263
摘要
Water-dispersible, photocatalytic Fe3O4@TiO2 core–shell magnetic nanoparticles have been prepared by anchoring cyclodextrin cavities to the TiO2 shell, and their ability to capture and photocatalytically destroy endocrine-disrupting chemicals, bisphenol A and dibutyl phthalate, present in water, has been demonstrated. The functionalized nanoparticles can be magnetically separated from the dispersion after photocatalysis and hence reused. Each component of the cyclodextrin-functionalized Fe3O4@TiO2 core–shell nanoparticle has a crucial role in its functioning. The tethered cyclodextrins are responsible for the aqueous dispersibility of the nanoparticles and their hydrophobic cavities for the capture of the organic pollutants that may be present in water samples. The amorphous TiO2 shell is the photocatalyst for the degradation and mineralization of the organics, bisphenol A and dibutyl phthalate, under UV illumination, and the magnetism associated with the 9 nm crystalline Fe3O4 core allows for the magnetic separation from the dispersion once photocatalytic degradation is complete. An attractive feature of these “capture and destroy” nanomaterials is that they may be completely removed from the dispersion and reused with little or no loss of catalytic activity.
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