Low-temperature preparation of anatase titania-coated magnetite |
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Authors: | Jingjing Xu Yanhui Ao Degang Fu Chunwei Yuan |
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Institution: | a School of Chemistry and Chemical Engineering, Southeast University. Nanjing 210096, China b State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China |
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Abstract: | A composite photocatalyst with an anatase titania shell and a magnetite core was prepared in a novel way at low temperature (75 °C at most) by coating photoactive titanium dioxide onto a magnetic Fe3O4 core. The photocatalytic activity of the prepared photocatalyst was evaluated by the degradation of model contaminated water of phenol and compared to single-phase titania (either Degussa P25 or prepared titania without magnetic Fe3O4). The results showed that the photoactivity was slightly depressed. Then, a remarkable improvement in photoactivity was achieved by modifying the photocatalyst with a SiO2 layer between the Fe3O4 core and TiO2 shell. The repetitive using of the modified photocatalyst was also investigated, and experimental results illustrated that the photocatalytic-degraded ratio of phenol was still higher than 80% after six cycles. |
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Keywords: | A Nanostructures B Sol-gel growth |
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