水热法原位合成磁性BiFeO<sub>3</sub>-石墨烯杂化材料及其光催化性能

甘露; 徐立杰; 钱堃; 王亚东; 江富远

水热法原位合成磁性BiFeO₃-石墨烯杂化材料及其光催化性能

1.
南京林业大学材料科学与工程学院, 江苏南京 210037;
2.
南京林业大学生物与环境学院, 江苏南京 210037;
3.
中国轻工业清洁生产中心, 北京 100012;
4.
北京云之清水生物科技有限公司, 北京 100060

基金项目: 江苏省自然科学基金项目（BK20160936）；南京林业大学大学生实践创新训练计划项目（2016NFUSPITP056）；南京林业大学大学生科技创新项目（DXSKC-201607）；江苏省青蓝工程、江苏高校优势学科建设工程PAPD.

详细信息

通讯作者:
甘露,博士,副教授.E-mail:ganlu@njfu.edu.cn

中图分类号: O643
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出版历程
- 收稿日期: 2018-02-01
- 录用日期: 2018-06-26
- 修回日期: 2018-06-10
- 刊出日期: 2018-06-28

Hydrothermal synthesis of magnetic graphene-BiFeO₃ hybrids and their photocatalytic properties

1.
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China;
2.
College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China;
3.
China Cleaner Production Center of Light Industry, Beijing 100012, China;
4.
Beijing Yonge Water Biological Technology Co., Ltd, Beijing 100060, China

Funds: Natural Science Foundation of Jiangsu Province, China (BK20160936); Students Practice Innovation and Training Program of Nanjing Forestry University (2016NFUSPITP056); Science and Technology Innovation Program of Nanjing Forestry University (DXSKC-201607); Qing Lan Project and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

摘要

摘要: 采用水热法在石墨烯表面原位合成了石墨烯含量不同的铁酸铋/石墨烯（BiFeO₃-石墨烯）杂化材料。采用X光射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶红外光谱（FTIR）等研究杂化材料的结构，紫外漫反射光谱（DRS）和荧光光谱（PL spectra）分析其光反应性。在卤钨灯光照条件下测试杂化材料催化降解亚甲基蓝（MB）和罗丹明B （RhB）染料的性能。结果表明，通过水热原位合成法，石墨烯均匀地穿插在BiFeO₃颗粒中并形成大小均一的球状结构。BiFeO₃-石墨烯杂化材料在可见光范围（400~800 nm）的吸收强度明显增加，禁带能隙明显降低。BiFeO₃-石墨烯杂化材料光催化降解有机污染物的速度较纯BiFeO₃显著提高，其中石墨烯质量含量为3%的杂化材料具有最高的降解速度，其光催化降解MB和RhB的速率常数为0.083和0.10，均为纯BiFeO₃降解染料速率的10倍以上，原因在于石墨烯有效地抑制并延后了激发电子和空穴的再结合。由于BiFeO₃具有铁磁性，BiFeO₃-石墨烯杂化材料可以用磁铁回收循环使用，且材料5次循环使用后染料降解效率仍可达到近100%。
- 光催化 /
- 石墨烯 /
- 铁酸铋 /
- 原位合成 /
- 磁性杂化材料 /
- 水热法
Abstract: The graphene-bismuth ferrite (Graphene-BiFeO₃) hybrids with different graphene contents were synthesized by a hydrothermal method. Their structure was characterized by XRD, SEM and FTIR. Their light reflection and absorption were investigated by UV-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy, respectively. Their photocatalytic properties were evaluated by degrading methylene blue (MB) and rhodamine B (RhB) dyes under irradiation with tungsten light. Results showed that the hybrids had a sphere-like morphology, within which the graphene was uniformly dispersed between the BiFeO₃ spheres. The hybrids had lower band gaps and higher absorption intensities in the visible light region (400-800 nm) than pure BiFeO₃, and achieved much higher degradation rates for both MB and RhB. The hybrid with a graphene content of 3.0 wt% exhibited the best photocatalytic performance, and its degradation rate constants for MB and RhB reached to 0.083 and 0.10, respectively, which are about 10 times higher than pure BiFeO₃. The introduction of the graphene effectively inhibited the recombination rate of the excited electrons and the holes in BiFeO₃. Their magnetism made them easy to recover from the dye solutions and their photocatalytic activities remained unchanged after recycling 5 times.
- Photocatalysis /
- Graphene /
- BiFeO₃ /
- In-situ synthesis /
- Magnetic hybrids /
- Hydrothermal method

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