采用煅烧三聚氰胺硝酸铁超分子水凝胶前驱体的方法,成功制备了新型镂空纳米带状α-氧化铁（NB-α-Fe₂O₃）。以NB-α-Fe₂O₃为光催化剂,讨论了催化剂用量和过氧化氢用量对光催化降解罗丹明B（RhB）的影响,并考察了催化剂的稳定性。通过X射线衍射仪（XRD）、扫描电镜（SEM）、透射电镜（HR-TEM）、比表面积测试仪（BET）和X射线光电子能谱仪（XPS）等对α-氧化铁的形貌、结构和组成进行了分析。结果显示,制备的氧化铁属于α晶相,具备较好的结晶度,是由粒径为40~70 nm的颗粒组装成镂空纳米带状结构。通过考察不同催化剂用量和过氧化氢用量对光催化降解RhB效果的影响,发现适宜的催化剂用量为30 mg、过氧化氢用量为0.5 mL。在适宜条件下NB-α-Fe₂O₃催化剂可见光降解RhB循环4次后降解率仍达到96.8%。制备的NB-α-Fe₂O₃具有良好的光催化活性与稳定性。

A novel hollow nanobelt α-Fe₂O₃（NB-α-Fe₂O₃） was successfully prepared by calcination of hydrogel precursor of melamine ferric nitrate supramolecular.Using NB-α-Fe₂O₃ as photocatalyst,the influence of the amount of catalyst and H₂O₂ on the performance of photocatalytic degradation of rhodamine B（RhB） were discussed,and the stability of the catalyst was investigated.The morphology,structure and composition of the as-prepared NB-α-Fe₂O₃ were analyzed by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（HR-TEM）,surface area tester（BET） and X-ray photoelectron spectroscopy（XPS）.The results showed that the prepared iron oxide belonged to α crystal phase and had good crystallinity,and the hollow nanobelt was assembled by α-Fe₂O₃ particles with 40~70 nm diameter.The effects of different amount of catalyst and hydrogen peroxide on the photocatalytic degradation of RhB were investigated.It was found that the optimal amount of catalyst and hydrogen peroxide were 30 mg and 0.5 mL,respectively.Under suitable conditions,after four cycles of visible light degradation RhB,the degradation efficiency of NB-α-Fe₂O₃ could still reach 96.8%.The as-prepared NB-α-Fe₂O₃ had good photocatalytic activity and stability.