MoO3/V2O5异质结构材料的静电纺丝法制备及光催化性能

doi:10.7503/cjcu20131114

摘要/Abstract

摘要：

以聚乙烯吡咯烷酮(PVP)、四水合钼酸铵[(NH₄)₆Mo₇O₂₄·4H₂O]和偏钒酸铵(NH₄VO₃)为原料, 利用静电纺丝技术结合溶胶-凝胶法制备了在可见光区具有高光催化活性的MoO₃/V₂O₅异质结构半导体光催化剂. 采用X射线衍射光谱(XRD)、傅里叶变换红外光谱(FTIR)、场发射扫描电子显微镜(FE-SEM)、 X射线光电子能谱(XPS)和紫外-可见(UV-Vis)漫反射光谱等测试手段对材料进行了表征. 以光降解亚甲基蓝(MB)为模型反应, 考察了MoO₃/V₂O₅异质结构材料的光催化性能. 结果表明, n(Mo)/n(V)>1∶8时均能形成MoO₃/V₂O₅异质结构且带隙明显宽于V₂O₅, 可有效地实现光生电子和空穴的分离, 增强体系的量子效率, 促进光催化活性的提高, 其中n(Mo)/n(V)=1∶6时光催化活性最高(达到97.24%), 并分析和探讨了光催化机理.

关键词: 光催化剂, 异质结构, 静电纺丝法, MoO3/V2O5

Abstract:

MoO₃/V₂O₅ heterostructures with high photocatalytic activity in visible light region were synthesized via electrospinning technique and sol-gel process. The morphologies and structures of MoO₃/V₂O₅ heterostructures were characterized by X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectroscopy. The photocatalytic performances of MoO₃/V₂O₅ heterostructures were evaluated by the photodegradation of methylene blue(MB) under visible light irradiation. The results indicated that heterojunctions between MoO₃ and V₂O₅ were formed when the n(Mo)/n(V) ratio was above 1∶8, and the separation of photogenerated electron-hole pairs on MoO₃/V₂O₅ heterostructures was promoted, which made the decolorization rate of MB by MoO₃/V₂O₅ heterostructures much higher than usage of pure V₂O₅ nanofibers. The optimum n(V)/n(Mo) ratio of MoO₃/V₂O₅ heterostructures was found to be about 1∶6 and the decolorization rate of MB could be reached 97.24%. In addition, the photocatalytic mechanism of the MoO₃/V₂O₅ heterostructures was further analyzed and discussed.

Key words: Photocatalyst, Heterostructures, Electrospinning, MoO3/V2O5

中图分类号:

O614
O643.36

TrendMD:

揣宏媛, 周德凤, 朱晓飞, 杨国程, 李朝辉. MoO₃/V₂O₅异质结构材料的静电纺丝法制备及光催化性能. 高等学校化学学报, 2014, 35(5): 941.

CHUAI Hongyuan, ZHOU Defeng, ZHU Xiaofei, YANG Guocheng, LI Zhaohui. Electrospinning Preparation and Visible-light Photocatalytic Activity of MoO₃/V₂O₅ Heterostructures^†. Chem. J. Chinese Universities, 2014, 35(5): 941.

图/表 10

Fig.1 XRD patterns of V2O5(a), MV-8(b), MV-6(c), MV-4(d), MV-2(e) and MoO3(f)

Fig.2 FTIR spectra of V2O5(a), MV-8(b), MV-6(c), MV-4(d), MV-2(e) and MoO3(f)

Fig.3 FE-SEM images of sample V2O5(A), MV-8(B), MV-6(C), MV-4(D), MV-2(E) and MoO3(F)

Fig.4 EDS spectrum of sample MV-8

Fig.5 Synthetic process of MoO3/V2O5 heterostructures

Fig.6 XPS survey spectra(A) and XPS spectra of Mo3d(B), V2p(C) and O1s(D) of sample MV-86^(A) a. V2O5, b. MV-8, c. MoO3; (B) a. MoO3, b. MV-8; (C) a. V2O5, b. MV-8; (D) a. V2O5, b. MV-8, c. MoO3.

Fig.7 UV-Vis diffuse reflectance spectra of the sample MoO3(A), V2O5 and MoO3/V2O5(B)^ a. V2O5; b. MV-8; c. MV-6; d. MV-4; e. MV-2.

Fig.8 Decolorization rates of MB on V2O5(a), MV-8(b), MV-6(c), MV-4(d), MV-2(e), MoO3(f) and MB(g)

Table 1 Absolute electronegativity, caculated CB edge(Ec), calculated VB(Ev), position and band gap energy for the semiconductors at the point of zero charge

Semiconductor	X/eV	E_c/eV	E_v/eV	E_g/eV
V₂O₅	6.10	0.54	2.67	2.13
MoO₃	6.39	0.48	3.30	2.82

Fig.9 Mechanism schematic diagram of MoO3/V2O5heterostructures photocatalyst

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MoO₃/V₂O₅异质结构材料的静电纺丝法制备及光催化性能

Electrospinning Preparation and Visible-light Photocatalytic Activity of MoO₃/V₂O₅ Heterostructures^†

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