水热法制备氧化钇空心纳米花及其吸附性能

采用水热法制备单分散、粒径均一的碱式碳酸钇(Y(OH)CO₃)前驱体,经过高温煅烧处理得到氧化钇(Y₂O₃)空心纳米花。通过傅里叶转换红外分析(FT-IR),场发射扫描电子显微镜(FESEM),透射电子显微镜(TEM),X射线衍射(XRD),X射线能谱(XPS)以及N₂吸-脱附等来表征样品,并研究了Y₂O₃空心纳米花吸附重铬酸钾(K₂Cr₂O₇)的能力。实验结果表明:水热法制备的前驱体为Y(OH)CO₃,经高温煅烧处理得到立方相Y₂O₃空心纳米花,尺寸约140 nm,比表面积为15 m²·g^-1,讨论了Y₂O₃空心纳米花的形成机理。水热法制备的Y₂O₃空心纳米花对K₂Cr₂O₇溶液的去除率可高达88.5%,吸附量为11.06 mg·g^-1,约为Y₂O₃粉末的6倍。

Yttria Hollow Nano-flowers Synthesized by Hydrothermal Method and Their Adsorption Capacity

Uniform-sized and monodisperse carbonate hydroxide yttrium (Y(OH)CO₃) precursor were synthesized by hydrothermal method, and then Yttria (Y₂O₃) hollow nano-flower were obtained through high temperature calcination. The obtained products were characterized by fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectrum (XPS), specific surface area and pore size distribution, the adsorption capacity of Y₂O₃ hollow nano-flowers for potassium dichromate (K₂Cr₂O₇) was investigated. Results indicate that the precursors are Y(OH)CO₃, the Y₂O₃ hollow nano-flowers with cubic fluorite structure were obtained through high-temperature calcination, the size of Y₂O₃ is about 140 nm and their specific surface area is 15 m²·g^-1. The formation mechanism of Y₂O₃ hollow nano-flowers was proposed. The Y₂O₃ hollow nano-flowers show an excellent adsorption of K₂Cr₂O₇ solutions at room temperature and their removal rate is about 88.5%, the maximum adsorption capacity is 11.06 mg·g^-1, which is 6 times of Y₂O₃ powders.