| 漂浮型BiFeO3/膨胀珍珠岩的制备及其可见光催化性能 |
| Synthesis and Visible-Light-Driven Photocatalytic Properties of Floating BiFeO3/Expanding Perlite Photocatalysts |
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| 摘要: 利用水热法制备了新颖的、漂浮型的膨胀珍珠岩（EP）负载BiFeO3（BiFeO3/EP）复合光催化材料。采用X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱仪（XPS）和紫外可见漫反射（UV-Vis-DRS）对制备的复合材料进行了表征与分析。SEM和TEM结果清楚地表明BiFeO3纳米粒子已被负载到EP表面。与纯BiFeO3相比，BiFeO3/EP复合材料明显提高了对可见光的吸收能力，减小了带隙宽度，在可见光下对亚甲基蓝（MB）的降解表现出更强的光催化活性。其中，70% BiFeO3/EP复合材料对MB染料废水的光催化活性最高，其光催化反应一级速率常数是纯BiFeO3的2.2倍。由于质轻中空的特点，制备的BiFeO3/EP颗粒漂浮在液面上，有利于相分离和反应后光催化剂的回收。材料的重复性试验表明，复合材料在MB光降解过程中是相当稳定的。 |
| 关键词: BiFeO3 膨胀珍珠岩 光催化 可见光 |
| 基金项目: 中国博士后基金（No.2012M511254）和江苏省大学生创新训练计划项目（No.201711460054x）资助。 |
| Abstract: A series of floating photocatalysts containing BiFeO3 nanoparticles on the expanding perlite (EP) support were synthesized by hydrothermal method. The as-prepared composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and UV-Vis diffusion reflection (UV-Vis DRS). The SEM and TEM analyses indicated that BiFeO3 was dispersed on the surface of EP. The DRS spectra revealed that the composites had improved optical adsorption in the visible light region, and exhibited enhanced photocatalytic activity for methylene blue (MB) degradation under visible light irradiation. It was found that the 70%BiFeO3/EP composite showed the highest photocatalytic activity for MB dye wastewater treatment, and the first-order rate constant for 70%BiFeO3/EP was 2.2 times higher than that for pure BiFeO3. Owing to the low density of EP, the as-prepared BiFeO3/EP particles floated in water to favor phase separation and the recovery of the photocatalyst after the reaction. The recovery test shows that the composite was rather stable during the MB photodegradation. |
| Keywords: BiFeO3 expanded perlite photocatalysis visible light |
| 投稿时间：2020-09-28 修订日期：2021-01-10 |
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| 张进,郭迎春,刘婵璐,徐丹.漂浮型BiFeO3/膨胀珍珠岩的制备及其可见光催化性能[J].无机化学学报,2021,37(5):905-913. |
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