Bi/TiO2:Sm3+复合纤维的制备及可见光催化降解抗生素洛美沙星

doi:10.16552/j.cnki.issn1001-1625.2024.1373

摘要/Abstract

摘要： 以静电纺丝技术制备TiO₂:Sm³⁺纳米纤维,结合原位水热法,在葡萄糖酸钠作用下,合成Bi/TiO₂:Sm³⁺复合纤维。利用XRD和XPS表征样品的物相和组成,利用SEM和TEM观察样品的微观形貌,利用紫外-可见漫反射光谱和瞬态光电流等分析样品的光电性能。结果表明,Sm³⁺进入TiO₂晶格,占据Ti⁴⁺的位置,造成TiO₂晶格膨胀,引起晶格畸变。稀土掺杂引入的晶格缺陷能够提高TiO₂的费米能级,增加表面能量壁垒,使光生电子和空穴在表面的复合概率降低;金属Bi通过表面等离子体共振效应,结合稀土元素丰富的能级结构和4f电子跃迁特性,对TiO₂进行双重修饰改性,进一步提高了TiO₂的光催化活性和稳定性。可见光照5 h,Bi/TiO₂:Sm³⁺复合纤维对洛美沙星的降解效果最佳,达到97.37%,分别是Sm³⁺:TiO₂和Bi/TiO₂的1.7和1.3倍。

关键词: Bi/TiO₂:Sm³⁺复合纤维, 洛美沙星, 表面等离子体共振, 稀土离子掺杂, 可见光催化活性

Abstract: TiO₂:Sm³⁺ nanofibers were prepared by electrospinning technology, and Bi/TiO₂:Sm³⁺ composite fibers were synthesized by in-situ hydrothermal method under the action of sodium gluconate. The phase and composition of samples were characterized by XRD and XPS. The microstructure of samples was observed by SEM and TEM. The photoelectric properties of samples were analyzed by UV-Vis diffuse reflectance spectroscopy and transient photocurrent. The results show that Sm³⁺ enters the TiO₂ lattice and occupies the position of Ti⁴⁺, resulting in the expansion and distortion of TiO₂ lattice. The lattice defects introduced by rare earth doping can increase the Fermi level of TiO₂, increase the surface energy barrier, and reduce the recombination probability of photogenerated electrons and holes on the surface. Metal Bi, through the surface plasmon resonance effect, combined with the rich energy level structure and 4f electron transition characteristics of rare earth elements, the double modification of TiO₂ is carried out to further improve the photocatalytic activity and stability of TiO₂. Under visible light irradiation for 5 h, the degradation effect of Bi/TiO₂:Sm³⁺ composite fiber for lomefloxacin is the best, reaching 97.37%, which is 1.7 times and 1.3 times that of Sm³⁺:TiO₂ and Bi/TiO₂, respectively.

Key words: Bi/TiO₂:Sm³⁺ composite fiber, lomofloxacin, surface plasmon resonance, rare earth ion doping, visible light photocatalytic activity

中图分类号:

O643

李跃军, 曹铁平, 孙大伟. Bi/TiO₂:Sm³⁺复合纤维的制备及可见光催化降解抗生素洛美沙星[J]. 硅酸盐通报, 2025, 44(5): 1918-1926.

LI Yuejun, CAO Tieping, SUN Dawei. Preparation of Bi/TiO₂:Sm³⁺ Composite Fibers and Visible Light Photocatalytic Degradation of Antibiotic Lomofloxacin[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1918-1926.

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Bi/TiO₂:Sm³⁺复合纤维的制备及可见光催化降解抗生素洛美沙星

Preparation of Bi/TiO₂:Sm³⁺ Composite Fibers and Visible Light Photocatalytic Degradation of Antibiotic Lomofloxacin

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