| 可磁分离二氧化钛光催化剂的制备及其光催化性能 |
| Magnetically Separable TiO2: Preparation and Photocatalytic Properties |
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| 摘要: 通过液相催化相转化的方法制备了一种可磁分离的光催化剂TiO2/SiO2/NiFe2O4(TSN)，这种光催化剂显示出了超顺磁性，能够通过外加磁场方便的实现催化剂在水中的分离与回收。该光催化剂的X-射线衍射和TEM结果表明：纳米TiO2颗粒包裹在磁性颗粒-SiO2/NiFe2O4(SN)的周围形成TiO2层。利用光催化降解甲基橙的效果来考察了这种光催化剂的活性，结果表明：在NiFe2O4和TiO2之间包覆一层无定型的SiO2，可以显著的提高催化剂的脱色效果，3次循环后，仍能保持良好的催化活性。 |
| 关键词: 磁分离 光催化 纳米二氧化钛 |
| 基金项目: |
| Abstract: A magnetically separable photocatalyst TiO2/SiO2/NiFe2O4(TSN) was prepared by a liquid catalytic phase transformation method. The catalyst thus obtained shows high photocatalytic activity for the degradation of methyl orange in water under UV irradiation. The magnetic property measurements indicate that the photocatalyst possesses superparamagnetic nature. It can be separated from water when an external magnetic field is added and redispersed into water solution after the external magnetic field is eliminated. XRD and TEM were used to characterize the structure of photocatalyst TSN, indicating that the magnetic SN particle was compactly enveloped by P-25 titania, and TiO2 shell was formed. The degradation experiments of methyl orange indicated that the thin SiO2 layer between NiFe2O4 and TiO2 shell could improve the photocatalytic activity of TSN. The recycled TSN exhibited a good repeatability of the photocatalytic activity. |
| Keywords: magnetically separable photocatalysis nanosized TiO2 |
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| 许士洪,冯道伦,李登新,上官文峰.可磁分离二氧化钛光催化剂的制备及其光催化性能[J].无机化学学报,2008,24(5):785-790. |
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