高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (4): 629-635.doi: 10.7503/cjcu20170425

• 研究论文: 无机化学 • 上一篇    下一篇

Bi25FeO40/α-Fe2O3复合纳米颗粒光催化剂的制备与性能

丛日敏1(), 于怀清1, 罗运军2, 李蛟1, 王卫伟1, 李秋红1, 孙武珠1, 司维蒙1, 张华1   

  1. 1. 山东理工大学材料科学与工程学院, 淄博 255049
    2. 北京理工大学材料科学与工程学院, 北京 100081
  • 收稿日期:2017-07-03 出版日期:2018-04-10 发布日期:2018-03-21
  • 作者简介:联系人简介: 丛日敏, 女, 博士, 副教授, 主要从事新型功能材料方面的研究. E-mail:congrimin0219@163.com
  • 基金资助:
    山东省高等学校科技计划项目(批准号: J11LD12)、 山东省自然科学基金(批准号: ZR2011BL006, ZR2010BM011, ZR2015BM02)和山东理工大学青年教师发展支持计划项目资助

Synthesis and Properties of Bi25FeO40/α-Fe2O3 Composite Nanoparticle Photocatalysts

CONG Rimin1,*(), YU Huaiqing1, LUO Yunjun2, LI Jiao1, WANG Weiwei1, LI Qiuhong1, SUN Wuzhu1, SI Weimeng1, ZHANG Hua1   

  1. 1. School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, China
    2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
  • Received:2017-07-03 Online:2018-04-10 Published:2018-03-21
  • Contact: CONG Rimin E-mail:congrimin0219@163.com
  • Supported by:
    † Supported by the Project of Shandong Province Higher Educational Science and Technology Program, China(No.J11LD12), the Natural Science Foundation of Shandong Province, China(Nos.ZR2011BL006, ZR2010BM011, ZR2015BM02) and the Young Teachers Program of Shandong University of Technology, China

摘要:

采用溶剂热法, 以聚酰胺-胺(PAMAM)树形分子为稳定剂, 分别制备了Bi25FeO40和Bi25FeO40/α-Fe2O3复合纳米颗粒, 并利用X射线衍射仪(XRD)、 高分辨透射电镜(HRTEM)、 X射线光电子能谱仪(XPS)、 紫外-可见吸收光谱仪(UV-Vis)、 比表面积和孔径分析仪(BET)和超导量子干涉磁强计等对其结构和性能进行了表征. 结果表明, 2种颗粒均为球形, 尺寸均匀, 粒径小于10 nm. 当原料中Bi3+/Fe3+摩尔比为25:1时, 产物为Bi25FeO40纳米颗粒; Bi3+/Fe3+摩尔比为1:1时, 产物为Bi25FeO40/α-Fe2O3复合纳米颗粒. 与Bi25FeO40纳米颗粒相比, Bi25FeO40/α-Fe2O3复合纳米颗粒的带隙变窄, 对可见光吸收范围变宽, 饱和磁化强度和光催化活性明显增强. 这是由于复合颗粒中的α-Fe2O3具有超顺磁性, 且两相界面存在的异质结构有利于光生载流子的分离和迁移, 提高催化活性. 2种纳米颗粒均可磁性回收, 重复使用3次后催化活性下降较小.

关键词: Bi25FeO40, α-Fe2O3, 复合纳米颗粒, 磁性, 光催化剂

Abstract:

Pure Bi25FeO40 nanoparticles and Bi25FeO40/α-Fe2O3 composite nanoparticles were synthsized through solvothermal porcess by using polyamidoamine(PAMAM) dendrimer stabilizer with a Bi3+/Fe3+ molar ratio of 25:1 and 1:1 in the reaction system, respectively. The structure, morphology and properties of the samples were characterized by X-ray diffraction(XRD), high resolution transmission electron microscopy(HRTEM), X-ray photoelectron spectroscopy(XPS), ultraviolet-visible spectroscopy(UV-Vis), Brunauer-Emmett-Teller(BET) surface area analysis and magnetic hysteresis loops measurenent. The results show that these particles are uniform balls with the diameter less than 10 nm. Compared with pure Bi25FeO40 nanoparticles, Bi25FeO40/α-Fe2O3 composite nanoparticles have smaller band gap, broader visible light absorption range, and significantly greater saturation magnetization and photocatalytic activity. These excellent properties of Bi25FeO40/α-Fe2O3 composite nanoparticles come from the superparamagnetic α-Fe2O3 component, and the heterogeneous structure of the phase boundary which promotes the efficient separation and migration of photogenerated carriers at the junction interfaces. These nanoparticles could be recycled in external magnetic field, and the catalytic activity decreased slightly after being reused for 3 times.

Key words: Bi25FeO40, α-Fe2O3, Composite nanoparticles, Magnetic property, Photocatalyst

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