Bi_(25)FeO_(40)/α-Fe_2O_3复合纳米颗粒光催化剂的制备与性能  

Synthesis and Properties of Bi_(25)FeO_(40)/α-Fe_2O_3 Composite Nanoparticle Photocatalysts

作　　者：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 司维蒙 张华[1] CONG Rimin;YU Huaiqing;LUO Yunjun;LI Jiao;WANG Weiwei;LI Qiuhong;SUN Wuzhu;SI Weimeng;ZHANG Hua(School of Materials Science and Engineering, Shandong University of Technology, Zibo 255049, China;School of Materials Science and Engineering, Belting Institute of Technology, Beijing 100081, China)

机构地区：[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

出　　处：《高等学校化学学报》2018年第4期629-635,共7页Chemical Journal of Chinese Universities

基　　金：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);山东理工大学青年教师发展支持计划项目资助~~

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Bi_(25)FeO_(40)和Bi_(25)FeO_(40)/α-Fe_2O_3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Bi^(3+)/Fe^(3+)摩尔比为25∶1时,产物为Bi_(25)FeO_(40)纳米颗粒;Bi^(3+)/Fe^(3+)摩尔比为1∶1时,产物为Bi_(25)FeO_(40)/α-Fe_2O_3复合纳米颗粒.与Bi_(25)FeO_(40)纳米颗粒相比,Bi_(25)FeO_(40)/α-Fe_2O_3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-Fe_2O_3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.Pure Bi（25）FeO（40） nanoparticles and Bi（25）FeO（40）/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）,BrunauerEmmett-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 Bi（25）FeO（40） nanoparticles,Bi（25）FeO（40）/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 Bi（25）FeO（40）/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.

关 键 词：Bi25FeO40 Α-FE2O3 复合纳米颗粒 磁性 光催化剂 

分 类 号：O614[理学—无机化学]