Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
ACS Nano. 2013 May 28;7(5):4093-104. doi: 10.1021/nn400287k. Epub 2013 May 1.
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.
已制备出通过将环糊精空腔锚定到 TiO2 壳上而分散在水中的光催化 Fe3O4@TiO2 核壳磁性纳米粒子，并证明了它们捕获和光催化破坏水中存在的内分泌干扰化学物质双酚 A 和邻苯二甲酸二丁酯的能力。功能化纳米粒子可以在光催化后从分散体中通过磁性分离并因此而重复使用。环糊精功能化 Fe3O4@TiO2 核壳纳米粒子的每个组成部分在其功能中都起着关键作用。键合的环糊精负责纳米粒子的水分散性，其疏水性空腔负责捕获水样品中可能存在的有机污染物。无定形 TiO2 壳是在紫外光照射下降解和矿化有机物双酚 A 和邻苯二甲酸二丁酯的光催化剂，与 9nm 结晶 Fe3O4 核相关的磁性允许在光催化降解完成后从分散体中通过磁性分离。这些“捕获和破坏”纳米材料的一个吸引人的特点是，它们可以从分散体中完全去除并重复使用，几乎没有或没有催化活性损失。
