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Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Facile method to synthesize magnetic iron oxides/TiO2 hybrid nanoparticles and their photodegradation application of methylene blue | Wu et al. Nanoscale Research Letters 2011 6 533 http www.nanoscalereslett.eom content 6 1 533 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Facile method to synthesize magnetic iron oxides TiO2 hybrid nanoparticles and their photodegradation application of methylene blue Wei Wu1 2 3 Xiangheng Xiao1 2 Shaofeng Zhang1 2 Feng Ren1 2 and Changzhong Jiang1 2 Abstract Many methods have been reported to improving the photocatalytic efficiency of organic pollutant and their reliable applications. In this work we propose a facile pathway to prepare three different types of magnetic iron oxides TiO2 hybrid nanoparticles NPs by seed-mediated method. The hybrid NPs are composed of spindle hollow and ultrafine iron oxide NPs as seeds and 3-aminopropyltriethyloxysilane as linker between the magnetic cores and TiO2 layers respectively. The composite structure and the presence of the iron oxide and titania phase have been confirmed by transmission electron microscopy X-ray diffraction and X-ray photoelectron spectra. The hybrid NPs show good magnetic response which can get together under an external applied magnetic field and hence they should become promising magnetic recovery catalysts MRCs . Photocatalytic ability examination of the magnetic hybrid NPs was carried out in methylene blue MB solutions illuminated under Hg light in a photochemical reactor. About 50 to 60 of MB was decomposed in 90 min in the presence of magnetic hybrid NPs. The synthesized magnetic hybrid NPs display high photocatalytic efficiency and will find recoverable potential applications in cleaning polluted water with the help of magnetic separation. Keywords magnetic iron oxide nanoparticles TiO2 hybrid structure photocatalyst methylene blue Introduction Extended and oriented nanostructures are desirable for many applications but facile fabrication of complex nanostructures with controlled crystalline morphology orientation and surface architectures remains a significant .
