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SnO2-TiO2复合颗粒的形态结构及其光催化活性   总被引:12,自引:0,他引:12       下载免费PDF全文
在气溶胶反应器中,利用TiCl4高温氧化反应制备超细TiO2,采用均匀沉淀法在TiO2表面沉积SnO2制备SnO2-TiO2复合颗粒,应用TEM、EEDS、SRD、BET比表面积测试等手段对粒子进行表征。以活性艳红X-3B复合颗粒,应用TEM、EDS、XRD、BET比表面积测试等手段对粒子进行表征。以活性艳红X-3B溶液为处理对象考察复合颗粒的光催化活性。结果表明SnO2-TiO2复合颗粒的光催化  相似文献
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Fe3O4 ferrofluids containing monodisperse Fe3O4 nanoparticles with different diameters of 8, 12, 16 and 18nm are prepared by using high-temperature solution phase reaction. The particles have single crystal structures with narrow size distributions. At room temperature, the 8-nm ferrofluid shows superparamagnetic behaviour, whereas the others display hysteresis properties and the coercivity increases with the increasing particle size. The spin glass-like behaviour and cusps near 190K are observed on all ferrofluids according to the temperature variation of field-cooled (FC) and zero-field-cooled (ZFC) magnetization measurements. The cusps are found to be associated with the freezing point of the solvent. As a comparison, the ferrofluids are dried and the FC and ZFC magnetization curves of powdery samples are also investigated. It is found that the blocking temperatures for the powdery samples are higher than those for their corresponding ferrofluids. Moreover, the size dependent heating effect of the ferrofluids is also investigated in ac magnetic field with a frequency of 55 kHz and amplitude of 200 Oe.  相似文献
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