通过制备磁性光催化剂材料BiVO₄/MnZnFe₂O₄对锰锌铁氧体的新见解

Xie Taiping, Liu Chenglun, Xu Longjun, Li Hui

State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China.

Chongqing Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology (EBEAM), Yangtze Normal University, Chongqing 408100, China.

Materials (Basel). 2018 Feb 26;11(3):335. doi: 10.3390/ma11030335.

BiVO₄/MnZnFe₂O₄ was prepared by the impregnation roasting method. XRD (X-ray Diffractometer) tests showed that the prepared BiVO₄ is monoclinic crystal, and the introduction of MnZnFe₂O₄ does not change the crystal structure of BiVO₄. The introduction of a soft-magnetic material, MnZnFe₂O₄, was beneficial to the composite photocatalyst's separation from the liquid solution using an extra magnet after use. UV-vis spectra analysis indicated that MnZnFe₂O₄ enhanced the absorption intensity of visible light for BiVO₄. EIS (electrochemical impedance spectroscopy) investigation revealed that the introduction of MnZnFe₂O₄ enhanced the conductivity of BiVO₄, further decreasing its electron transfer impedance. The photocatalytic efficiency of BiVO₄/MnZnFe₂O₄ was higher than that of pure BiVO₄. In other words, MnZnFe₂O₄ could enhance the photocatalytic reaction rate.

采用浸渍焙烧法制备了BiVO₄/MnZnFe₂O₄。X射线衍射仪（XRD）测试表明，制备的BiVO₄为单斜晶体，MnZnFe₂O₄的引入并未改变BiVO₄的晶体结构。软磁材料MnZnFe₂O₄的引入有利于复合光催化剂在使用后通过外加磁铁从液体溶液中分离。紫外可见光谱分析表明，MnZnFe₂O₄增强了BiVO₄对可见光的吸收强度。电化学阻抗谱（EIS）研究表明，MnZnFe₂O₄的引入提高了BiVO₄的电导率，进一步降低了其电子转移阻抗。BiVO₄/MnZnFe₂O₄的光催化效率高于纯BiVO₄。换句话说，MnZnFe₂O₄可以提高光催化反应速率。