TiO2/LaFeO3微纳米纤维的可控制备及光催化性能

doi:10.7503/cjcu20130886

高等学校化学学报 ›› 2014, Vol. 35 ›› Issue (1): 19.doi: 10.7503/cjcu20130886

• 研究论文: 无机化学 • 上一篇下一篇

TiO₂/LaFeO₃微纳米纤维的可控制备及光催化性能

刘阳, 季宏伟, 周德凤(), 朱晓飞, 李朝辉

长春工业大学化学与生命科学学院, 长春 130012

收稿日期:2013-09-10 出版日期:2014-01-10 发布日期:2013-12-11
作者简介:联系人简介: 周德凤, 女, 博士, 教授, 主要从事无机固体材料研究. E-mail:defengzhou65@126.com
基金资助:
国家自然科学基金(批准号: 20871023)、吉林省科技发展计划项目(批准号: 20101549, 20130102001JC)和吉林省教育厅项目(批准号: 2013130, 2013146)资助

Controllable Synthesis and Photocatalytic Activity of TiO₂/LaFeO₃ Micro-nanofibers^†

LIU Yang, JI Hongwei, ZHOU Defeng^*(), ZHU Xiaofei, LI Zhaohui

Department of Biological Engineering, Changchun University of Technology, Changchun 130012, China

Received:2013-09-10 Online:2014-01-10 Published:2013-12-11
Contact: ZHOU Defeng E-mail:defengzhou65@126.com
Supported by:
† Supported by the National Natural Science Foundation of China(No.20871023), the Development of Science and Technology Plan of Jilin Province, China(Nos.2010549, 20130102001JC) and the Programme of Jilin Provincial Education Department, China(Nos.2013130, 2013146)

摘要/Abstract

摘要：

利用静电纺丝技术及水热合成法制备了TiO₂/LaFeO₃异质结构. 采用场发射扫描电子显微镜(FE-SEM), X射线衍射(XRD), 傅里叶变换红外(FTIR)光谱和紫外-可见漫反射光谱(UV-Vis)等手段对TiO₂/LaFeO₃微纳米纤维的结构和表面形态进行表征. 通过亚甲基蓝(MB)光降解反应研究了其光催化性能. 结果表明, 不完全碳化TiO₂纤维表面的缺陷位点是LaFeO₃纳米粒子的有利生长点. TiO₂/LaFeO₃异质结材料的带隙明显窄于TiO₂, 光催化活性得到提高; 经140 min紫外光照射后, TiO₂/LaFeO₃异质结催化剂对MB的降解率为65.34%, 分析和探讨了其光催化机理.

关键词: TiO2/LaFeO3, 异质结构, 静电纺丝法, 水热合成法, 光催化性能

Abstract:

TiO₂/LaFeO₃ heterostructures were fabricated by electrospinning technique and hydrothermal synthesis method. The physicochemical properties of the catalysts were characterized by scanning electron microscopy(FE-SEM), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR) and ultraviolet-visible diffuse reflectance spectra(UV-Vis). The photocatalytic activity of TiO₂/LaFeO₃ micro-nanofibers toward the decomposition of methylene blue(MB) was investigated. The results indicate that defect sites of incompletely carbonized TiO₂ fibers are favorable for the growth of LaFeO₃ nanoparticles. The band gap of TiO₂/LaFeO₃ heterostructures is lower than TiO₂ improving the photocatalytic activity. After 140 min TiO₂/LaFeO₃ heterostructures exhibited 65.34% for MB under UV light, and the photocatalytic mechanism of TiO₂/LaFeO₃ heterostructures were analyzed and discussed.

Key words: TiO2/LaFeO3, Heterostructure, Electrospun, Hydrothermal synthesis, Photocatalytic activity

中图分类号:

O614.33

TrendMD:

刘阳, 季宏伟, 周德凤, 朱晓飞, 李朝辉. TiO₂/LaFeO₃微纳米纤维的可控制备及光催化性能. 高等学校化学学报, 2014, 35(1): 19.

LIU Yang, JI Hongwei, ZHOU Defeng, ZHU Xiaofei, LI Zhaohui. Controllable Synthesis and Photocatalytic Activity of TiO₂/LaFeO₃ Micro-nanofibers^†. Chem. J. Chinese Universities, 2014, 35(1): 19.

图/表 9

Fig.1 XRD patterns of PVP/Ti(OC4H9)4(a), incompletely carbonized TiO2(b), TiO2(c), LaFeO3(d), TL1(e) and TL2(f)

Fig.2 FTIR spectra of PVP/Ti(OC4H9)4(a), incompletely carbonized TiO2(b), TiO2(c), LaFeO3(d), TL1(e) and TL2(f)

Fig.3 FE-SEM images of sample PVP/Ti(OC4H9)4(A), TiO2(B), TL1(C), TL2(D), LaFeO3(E) and incompletely carbonized TiO2(F)

Fig.4 EDS spectrum of sample TL2

Fig.5 Schematic illustration for the synthesis process of TiO2/LaFeO3 heterostructures

Fig.6 UV-Vis-NIR spectra(A) and the plot of (Ahν)2 vs. photo energy(hv)(B—D) (A): a. TiO2, b. TL2, c. LaFeO3; (B) TiO2; (C) LaFeO3; (D) TL2.

Fig.7 Photocatalytic degradation rates of MB on the samples

Fig.8 Mechanism schematic diagram of the mechanism of TiO2/LaFeO3 photocatalyst

Table 1 Absolute electronegativity, calculated CB edge, calculated VB position and band gap energy for TiO2 and LaFeO3 at the point of zero charge

Semiconductor	X/eV	Calculated CB position/eV	Calculated VB position/eV	E_g/eV
TiO₂	5.81	-0.20	2.82	3.02
LaFeO₃	5.70	0.19	2.22	2.03

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TiO₂/LaFeO₃微纳米纤维的可控制备及光催化性能

Controllable Synthesis and Photocatalytic Activity of TiO₂/LaFeO₃ Micro-nanofibers^†

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