异质结型BaTiO3/TiO2复合纳米纤维的制备及光催化性能

doi:10.3724/SP.J.1077.2014.13508

摘要/Abstract

摘要：

以静电纺丝技术制备的TiO₂纳米纤维为模板和反应物, 采用水热法原位合成了具有异质结构的BaTiO₃/TiO₂复合纳米纤维。利用X射线衍射(XRD)、扫描电镜(SEM) 和高分辨透射电镜(HRTEM)等分析测试手段对样品的结构和形貌进行表征。结果表明: BaTiO₃纳米微粒均匀地生长在TiO₂纳米纤维表面, 制备了异质结型BaTiO₃/TiO₂复合纳米纤维。材料的光催化性能利用罗丹明B和苯酚的脱色降解反应测试。BaTiO₃/TiO₂复合纳米纤维材料, 在紫外光照射下, 光催化降解活性较纯锐钛矿TiO₂纳米纤维有明显提高, 罗丹明B和苯酚在该复合纳米纤维材料上的光催化降解反应遵循一级反应动力学。且易于分离、回收和再利用, 循环使用5次, 罗丹明B的脱色率仍保持在96%以上。

关键词: 静电纺丝, 水热合成, BaTiO3/TiO2复合纳米纤维, 光催化

Abstract:

Heterostructured BaTiO₃/TiO₂compositenanofibers were fabricated by in situ hydrothermal method using TiO₂ nanofibers as both template and reactant. The morphology and structure of BaTiO₃/TiO₂ composite nanofibers were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM). Photocatalytic activity was tested via rhodamine B and phenol degradation as the model reaction. The results showed that the as-fabricated sample was composed of BaTiO₃ nanoparticles assembling uniformly on the surface of TiO₂ nanofibers to form BaTiO₃/TiO₂ heterostructures. Compared with the pure TiO₂nanofibers, BaTiO₃/TiO₂ composite nanofibers exhibited enhanced photocatalytic activity in the decomposition of rhodamine B under UV illumination. The degradation of both RB and phenol followed first-order reaction kinetics, and the composite showed higher photoactivity than did the pure anatase TiO₂．The composite nanofibers also showed good catalytic stability and the decolorizing efficiency of RB solution remained as high as 96% after 5 times recycle. Moreover, the catalyst was easily separated and removed from the system after reaction and reuse.

Key words: electrospinning technique, hydrothermal synthesis, BaTiO3/TiO2 composite nanofibers, photocatalytic degradation

中图分类号:

O643

李跃军, 曹铁平, 梅泽民. 异质结型BaTiO₃/TiO₂复合纳米纤维的制备及光催化性能[J]. 无机材料学报, 2014, 29(7): 741-746.

LI Yue-Jun, CAO Tie-Ping, MEI Ze-Min. Preparation and Photocatalytic Properties of BaTiO₃/TiO₂ Heterostructured Nanofibers[J]. Journal of Inorganic Materials, 2014, 29(7): 741-746.

图/表 8

图1 TiO2纳米纤维(a)和BaTiO3/TiO2复合纳米纤维(b)的XRD图谱

Fig. 1 XRD patterns of TiO2 nanofibers (a) and BaTiO3/TiO2 composite nanofibers (b)

图2 TiO2纳米纤维(a)和BaTiO3/TiO2(b)复合纳米纤维的SEM照片

Fig. 2 SEM images of TiO2 nanofibers (a) and BaTiO3/TiO2 composite nanofibers (b)

图3 BaTiO3/TiO2复合纳米纤维的TEM、HRTEM和SAED照片

Fig. 3 TEM , HRTEM and SAED images of BaTiO3/TiO2 composite nanofibers

图4 不同样品的紫外-可见漫反射吸收光谱图

Fig. 4 UV-Vis absorption spectra of different samples

图5 紫外光照射下BaTiO3、TiO2和BaTiO3/TiO2对罗丹明B的光催化降解性能及动力学曲线

Fig. 5 Performance and kinetic curves of different catalyst samples for photodegradation of rhodamine B under UV illumination

图6 紫外光照射下BaTiO3、TiO2和BaTiO3/TiO2对苯酚的光催化降解性能及动力学曲线

Fig. 6 Performance and kinetic curves of different catalyst samples for photodegradation of phenol under UV illumination

图7 异质结型BaTiO3/TiO2的能带结构示意图

Fig. 7 Schematic diagram showing the energy band structure of BaTiO3/TiO2 heterstructure

图8 BaTiO3/TiO2复合纳米纤维重复使用5次光催化降解曲线

Fig. 8 Degradation curves of BaTiO3/TiO2 composite nanofibers for reusing 5 times

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异质结型BaTiO₃/TiO₂复合纳米纤维的制备及光催化性能

Preparation and Photocatalytic Properties of BaTiO₃/TiO₂ Heterostructured Nanofibers

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