| 表面等离子体共振效应增强S型异质结Bi2S3/TiO2光催化CO2还原性能 |
| Surface plasmon resonance effect enhanced photocatalytic CO2 reduction performance of S-scheme Bi2S3/TiO2 heterojunction |
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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，乙二醇为还原剂，采用原位水热法构筑了Bi/Bi2S3/TiO2复合纤维材料。利用粉末X射线衍射、X射线光电子能谱、扫描电子显微镜、紫外可见吸收光谱、光电流响应、电化学阻抗谱和荧光发射光谱对复合纤维材料的形貌、结构和光电性能进行了表征和分析。在气固相反应环境下，对Bi/Bi2S3/TiO2复合纤维的光催化CO2还原性能进行了研究。结果表明，金属Bi纳米粒子和鳞片状Bi2S3有序构筑在TiO2纳米纤维表面。金属Bi的表面等离子体共振(SPR)效应与Bi2S3/TiO2异质结产生了协同作用，有效增强了Bi/Bi2S3/TiO2的光催化CO2还原活性，还原反应主要产物为CH4和CH3OH，产率分别达到4.21和9.86 μmol·h-1·g-1，约为Bi2S3/TiO2的3倍。 |
| 关键词: 表面等离子体共振 S型异质结 光催化CO2还原 |
| 基金项目: 国家自然科学基金(No.21573003)和吉林省自然科学基金(No.201205034，20140101118JC)资助。 |
| Abstract: A novel Bi/Bi2S3/TiO2 composite fibers photocatalytic materials were constructed by in-situ hydrothermal method using TiO2 nanofibers prepared by electrospinning technology serve as the matrix, bismuth nitrate as the bismuth source and ethylene glycol as the reducing agent. The morphology, structure, and optoelectronic properties of the composite fibers material were analyzed by powder X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, ultraviolet-visible absorption spectroscopy, photocurrent response, electrochemical impedance spectroscopy, and fluorescence emission spectroscopy. The photocatalytic CO2 reduction performance of Bi/Bi2S3/TiO2 composite fibers under a gas-solid reaction system was investigated. The results show that metal Bi nanoparticles and scaly Bi2S3 are orderly constructed on the surface of TiO2 nanofibers. The surface plasmon resonance (SPR) effect of metal Bi has a synergistic effect with the Bi2S3/TiO2 S-scheme heterojunction, which enables the efficient spatial separation and transfer of photogenerated carriers and effectively enhances the photocatalytic activity of Bi/Bi2S3/TiO2. In-depth research found that the S-scheme heterojunction possesses a unique mechanism of carrier movement, resulting in a robust redox capacity and strong driving force. The main products of the photocatalytic CO2 reduction were CH4 and CH3OH, with yields of 4.21 and 9.86 μmol·h-1·g-1, respectively, about three times that of Bi2S3/TiO2. |
| Keywords: surface plasmon resonance S-scheme heterojunction photocatalytic CO2 reduction |
| 投稿时间：2024-10-12 修订日期：2025-03-06 |
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