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采用溶胶-凝胶法制备Ti1-xFexO2胶体,然后放入高压反应釜中进行热处理,得到了一组Ti1-xFexO2纳米粉末样品。利用X射线衍射仪(XRD)和拉曼光谱(Raman)对样品的结构进行表征。利用振动样品磁强计(VSM)对样品的磁性进行研究。利用紫外-可见光谱(UV-Vis)以罗丹明B溶液为目标降解物,考察了样品的光催化性能。研究发现,不同掺杂浓度的Ti1-xFexO2样品均为锐钛矿结构。Fe掺杂的样品表现出室温铁磁性,并且铁磁性来源于半导体本征磁性而不是来源于第二相。当掺杂浓度从0.0%增加到0.2%时,光催化活性增强。当掺杂浓度从0.2%增加到0.8%时,光催化活性下降。掺杂浓度为0.2%时光催化活性最好。
Ti1-xFexO2 colloids were prepared by sol-gel method, and then placed in a high-pressure reactor for heat treatment to obtain a group of Ti1-xFexO2 nanopowder samples. The structure of the sample was characterized by X-ray diffraction (XRD) and Raman spectroscopy (Raman). The magnetism of the sample was investigated using a vibrating sample magnetometer (VSM). The photocatalytic activity of the samples was investigated by UV-Vis with rhodamine B solution as the target degradation product. The study found that different doping concentration of Ti1-xFexO2 samples are anatase structure. Fe-doped samples exhibit room temperature ferromagnetism and ferromagnetism originates from semiconducting intrinsic magnetics rather than from the second phase. When the doping concentration is increased from 0.0% to 0.2%, the photocatalytic activity is enhanced. When the doping concentration is increased from 0.2% to 0.8%, the photocatalytic activity decreases. The photocatalytic activity is the best when the doping concentration is 0.2%.