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通过化学氧化沉淀法制备出球形和八面体形貌的Fe3O4纳米颗粒,对其进行XRD、Raman和SEM等表征。以合成的纳米Fe3O4催化H2O2氧化降解橙黄Ⅱ,考察了不同形貌Fe3O4的类Fenton催化活性。结果表明:使用化学氧化沉淀法制备Fe3O4,在低pH(8~9)条件下所得到的产物呈类球形,高pH(13)条件得到的产物为八面体形貌,其粒径均在210nm左右,并且结晶良好。Fe3O4/H2O2体系能有效降解橙黄II,并且催化反应主要发生在Fe3O4表面,最佳催化条件为pH 3.0、温度40℃。类球形Fe3O4纳米颗粒的催化活性高于八面体Fe3O4,并且Fe3O4具有良好的化学稳定性,重复使用4次效果稳定。
The spherical and octahedral Fe3O4 nanoparticles were prepared by chemical oxidation precipitation and characterized by XRD, Raman and SEM. The synthesis of orange Fe3O4 nano-Fe3O4 oxidative degradation of orange Huang Ⅱ, investigated Fe3O4 different Fenton-like catalytic activity. The results showed that Fe3O4 was prepared by chemical oxidation precipitation and the product was spherical at low pH (8-9). The product obtained under the condition of high pH (13) was octahedron with particle size of 210nm Around, and the crystallization is good. Fe3O4 / H2O2 system can effectively degrade orange yellow II, and the catalytic reaction mainly occurs on the surface of Fe3O4. The optimum catalytic conditions are pH 3.0 and temperature 40 ℃. The catalytic activity of the spherical Fe3O4 nanoparticles is higher than that of the octahedron Fe3O4, and the Fe3O4 has good chemical stability. The effect of the repeated use of the Fe3O4 nanoparticles is stable and stable.