Abstract
Recyclable visible-light photocatalyst Fe3O4@TiO2 with core-shell structure was prepared by a simple synthetic strategy using solvothermal crystallization of titanium precursor on preformed Fe3O4 nanopartiles. The photo-degradation reaction of neutral red aqueous solution was tested to evaluate the visible-light photocatalytic activity of the as prepared Fe3O4@TiO2 nanoparticles, which show excellent photocatalytic activity compared with commercial P25 catalyst. Moreover, the Fe3O4@TiO2 nanocomposites can be easily separated from the reaction mixture, and maintain favorable photocatalytic activity after five cycles. The high visible light absorption of the Fe3O4@TiO2 nanocomposites may originate from the absence of electronic heterojunction, excellently dispersity and the high specific surface area of the as-synthesized Fe3O4@TiO2 samples.
Highlights
IntroductionPollutions of commercial dyes have become one of the most serious environmental issues
Pollutions of commercial dyes have become one of the most serious environmental issues.Recently, photo-catalysis using sunlight has emerged as one of the most attractive techniques for various environmental applications such as wastewater treatment
The X-ray powder diffraction (XRD) patterns of the Fe3O4 and Fe3O4@TiO2 nanocomposites prepared under different temperature and different time were shown in Figures 1A,B, which showed that the as prepared samples are of high purity
Summary
Pollutions of commercial dyes have become one of the most serious environmental issues. Most of the previously reported Fe3O4@TiO2 systems suffer from dramatically reduced photocatalytic activities due to the electron-hole recombination resulting from the electronic heterojunction between the core-shell Fe3O4@TiO2 structures [16,17]. The high temperature (around 500 °C) treatment required during the synthesis usually led to the loss of magnetism, change of iron oxide phase or the generation of mixed iron/titanium oxide [18,19,20,21,22,23] Most of these composite systems only respond to UV light irradiation [24,25,26]. The as-prepared materials have higher visible-light absorption and much higher photo-catalytic activity in neutral red decomposition reaction comparing with commercial P25 and can be separated and recycled by simple utilization of a magnetic bar.
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