Fe掺杂Bi12TiO20光催化剂的制备及光催化性能

Pr-eparation and photocatalytic properties of Fe-doped Bi12TiO20 photocatalytic catalyst

摘要:

采用水热法制备Fe元素掺杂的Bi12TiO20光催化剂，对Bi12TiO20结构进行修饰，使用X射线衍射（XRD）、紫外-可见漫反射（UV-Vis DRS）、扫描电镜（SEM）、氮气吸附脱附、X射线光电子能谱（XPS）对光催化剂的形貌微观结构和化学价态进行表征，并应用在光催化降解亚甲基蓝（MB）上。实验结果表明，当Fe的掺杂量为5%时，催化剂的投加量为0.05g，对10mg/L的MB的降解率达到98.949%。经过Fe掺杂后，Fe-Bi12TiO20光催化剂形成了新的杂化能级，吸收带边界发生红移，进而提高催化剂的光催化活性，Fe是以+3和+2价掺杂于Bi12TiO20的晶体中。Fe-Bi12TiO20光催化剂，经过重复使用5次后，对MB的降解率仍然可以达到88%以上，具有优秀的光催化稳定性能。h+和·O2-是光催化降解过程中的主要活性物种。本文为Bi12TiO20材料的掺杂改性研究提供了参考。

Abstract:

Bi12TiO20 photocatalyst doped with Fe element was prepared by hydrothermal method, and the structure of Bi12TiO20 was modified by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance (UV-Vis DRS), scanning electron microscope (SEM), nitrogen adsorption and desorption, X-ray photoelectron spectroscopy (XPS) to characterize the morphology, microstructure and chemical valence state of the photocatalyst, and apply it to the photocatalytic degradation of methylthionine chloride (MB).The experimental results show that When the doping amount of Fe is 5%,the catalyst dosage is 0.05g, and the degradation rate of 10mg/L MB reaches 98.949%. After Fe doping, the Fe-Bi12TiO20 photocatalyst forms a new hybrid energy level, and the absorption band boundary is red-shifted, thereby improving the photocatalytic activity of the catalyst. Fe is a crystal doped in Bi12TiO20 with +3 and +2 valences middle.Fe-Bi12TiO20 photocatalyst, after repeated use for 5 times, the degradation rate of MB can still reach more than 88%, and it has excellent photocatalytic stability performance.Both h+ and·O2-are the main active species during photocatalytic degradation.This paper provides a reference for the doping modification of Bi12TiO20 materials.