Synthesis and characterization of super paramagnetic composite photocatalyst¡ªTitania/silica/nickel ferrite

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• 作者：Yu  ; Li  ; ;   ; ^{hyhuagong@163.com} ;   ; ^{hgliyu@nuc.edu.cn} ; Xiufang  ; Dong ; Junping  ; Li
• 关键词：Titania ; Mesoporous ; Photocatalyst ; Core&ndash ; shell
• 刊名：Particuology
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：9
• 期：5
• 页码：475-479
• 全文大小：947 K

文摘

Composite photocatalysts with TiO₂ porous shell and magnetic core were synthesized by using NiFe₂O₄ as a magnetic core, SiO₂ as an intermediate layer and polyethylene glycol with molecular weight of 1000 (PEG 1000) as a template direction agent. The samples were characterized with N₂ adsorption¨Cdesorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), vibrating sample magnetometry (VSM) and ultraviolet¨Cvisible (UV¨Cvis) spectroscopy. The results showed that the obtained composites are spherical particles about 50 nm in diameter. The mesoporous TiO₂ with magnetic core calcined at 350 ¡ãC, 450 ¡ãC, and 550 ¡ãC was found to have, respectively, different specific surface areas (94, 86, and 68 m²/g) and average pore sizes (1.4, 2.2, and 2.8 nm). The photocatalytic activity was investigated for degradation of nitrobenzene under UV irradiation. Nitrobenzene was decomposed in 300 min under irradiation of an 8 W UV lamp with a peak wavelength of 253.7 nm. The composite nanoparticles exhibited high photocatalytic efficiency and super paramagnetic nature for cleaning polluted water by magnetic separation.