| Bi2Ti2O7/TiO2/Bi4Ti3O12多异质结的构筑及其增强的可见光催化性能 |
| Fabrication of Bi2Ti2O7/TiO2/Bi4Ti3O12 multi-heterojunction and the enhanced visible photocatalytic performance |
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| 摘要: 以静电纺丝技术制备的TiO2纳米纤维为基质，硝酸铋为铋源，KOH为矿化剂，成功制备了多异质结Bi2Ti2O7/TiO2/Bi4Ti3O12复合纳米纤维光催化剂。通过X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射光谱(UV-Vis DRS)等一系列表征，对其物相组成、微观形貌和光学性质等进行分析。结果表明：TiO2纳米纤维的介入，将Ⅰ型异质结Bi2Ti2O7/Bi4Ti3O12分离为2个Ⅱ型异质结Bi2Ti2O7/TiO2和Bi4Ti3O12/TiO2。Bi2Ti2O7、Bi4Ti3O12和TiO2三者的协同作用，有效提高了可见光吸收能力，改变了光生载流子的传输路径，降低了光生电子与空穴的复合几率，从而获得高效的光催化降解CH3CHO性能。可见光照8 h，Bi4Ti3O12/TiO2/Bi2Ti2O7复合纳米纤维对CH3CHO的降解率达到87.1%。 |
| 关键词: TiO2纳米纤维 多异质结 光催化 水热法 |
| 基金项目: 国家自然科学基金(No.21573003)和国家级大学生创新创业训练计划项目(No.201810206003)资助。 |
| Abstract: In this work,we prepared double heterojunction Bi2Ti2O7/TiO2/Bi4Ti3O12 composite nanofibers by employing electrospun TiO2 nanofibers as the substrate,bismuth nitrate as the bismuth source,and potassium hydroxide as the mineralizing agent.Through a series of tests such as X-ray diffraction (XRD),scanning electron microscope (SEM),UV-visible diffuse reflectance spectrum (UV-Vis DRS),the phase composition,micromorphology,and optical properties of the Bi2Ti2O7/TiO2/Bi4Ti3O12 catalyst were analyzed.The results showed that the TiO2 changed type Ⅰ heterojunction into multi-heterojunction integrating two type Ⅱ heterojunctions.Photocatalytic tests demonstrated the activity of as-constructed multi-heterojunction was higher than that of single type Ⅰ or Ⅱ heterojunctions,respectively,where photogenerated electrons were accumulated on the surface of TiO2 and photogenerated holes were accumulated on Bi2Ti2O7 and Bi4Ti3O12,respectively.The synergistic effect of Bi2Ti2O7,Bi4Ti3O12,and TiO2 effectively improves the visible light absorption capacity,changes the transmission path of photo-generated carriers,and reduces the recombination probability of photogenerated electron-hole pairs,thereby obtaining the efficient photocatalytic degradation of CH3CHO.The acetaldehyde degradation rate of Bi2Ti2O7/TiO2/Bi4Ti3O12 reached 87.1% under visible light illumination for 8 h. |
| Keywords: TiO2 nanofibers multi-heterojunction photocatalytic hydrothermal method |
| 投稿时间：2022-10-21 修订日期：2023-02-17 |
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| 曹铁平,李跃军,孙大伟.Bi2Ti2O7/TiO2/Bi4Ti3O12多异质结的构筑及其增强的可见光催化性能[J].无机化学学报,2023,39(4):699-708. |
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