由钛铁矿合成磁性氧化钛纳米片基光催化剂
Magnetically Separable Titania Nanosheets Based Photocatalyst from Ilmenite
DOI: 10.12677/MS.2017.71012, PDF, HTML, XML, 下载: 1,867  浏览: 3,177  科研立项经费支持
作者: 薛 怡, 焦雅洁, 姚日立, 何倩瑜, 董晓平：浙江理工大学化学系，浙江 杭州
关键词: 可磁回收；Fe3O4@SiO2@TNSs；二维纳米片；可见光催化；Magnetic Recycling； Fe3O4@SiO2@TNSs； Two-Dimensional Nanosheets； Visible Light Photocatalysis
摘要: 以钛铁矿为原料，通过浓盐酸浸出法提取了其中的氧化钛和氧化铁，浸出率高达~97%，氧化钛和氧化铁的收率分别为~53%和~80%。并以氧化铁为原料合成了Fe3O4@SiO2磁核，通过固相合成及软化学剥离制备了二维氧化钛纳米片(TNSs)溶胶，并进一步制备了可磁分离的Fe3O4@SiO2@TNSs复合材料。以可见光或太阳光为光源，催化剂在H2O2辅助下表现出优异的活性，其降解RhB的速率常数分别是商品氧化钛P25以及Fe3O4/N-TiO2光催化剂的14.5倍和20.4倍。此外，相比于P25纳米氧化钛的难以回收，合成的Fe3O4@SiO2@TNSs催化剂在外磁场作用下实现快速回收。催化剂表现出极佳的稳定性和循环性，五次重复使用后仍能几乎完全降解有机污染物。
Abstract: TiO2 and Fe2O3 were extracted from ilmenite using a HCl treating method, in which the conversion ratio of ilmenite was ~97% and the yields of TiO2 and Fe2O3 were respectively ~ 53% and ~80%. With the prepared Fe2O3 as the precursor, we synthesized the magnetic core of Fe3O4@SiO2, and fur-ther fabricated the magnetically separable Fe3O4@SiO2@ titania nanosheets (TNSs) composite by using the two-dimensional TNSs from the solid reaction and the followed soft-chemistry exfoliation. This composite exhibited superior photocatalytic performance with the H2O2 assistance under visible light or sun light irradiation, and its rate constant for degradation of Rhodamine B was respectively 14.5 and 20.4 times higher than those of Degussa P25 TiO2 and Fe3O4/N-TiO2 samples. Moreover, in comparison to the recycling difficulty of P25 TiO2, the prepared Fe3O4@SiO2@TNSs composite could be easily recovered by the external magnet. This composite also exhibited the excellent stability and reusability, and after 5 successive cycles the dye molecules still could be decomposed.
文章引用：薛怡, 焦雅洁, 姚日立, 何倩瑜, 董晓平. 由钛铁矿合成磁性氧化钛纳米片基光催化剂[J]. 材料科学, 2017, 7(1): 88-98. http://dx.doi.org/10.12677/MS.2017.71012

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