Preparation of ZnO/Ag2O Nanofibers by Coaxial Electrospinning and Study of Their Photocatalytic Properties †

doi:10.7503/cjcu20190478

Abstract

Abstract:

ZnO/Ag₂O/FTO coaxial nanofibers(FTO: Fluoride-doped tin oxide conductive glass) were prepared by sol-gel process, coaxial electrospinning and heat treatment using zinc acetate and silver acetylacetonate as precursors. The structure and surface morphology of the materials were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM), Raman spectroscopy, UV-Visible diffuse-reflective spectroscopy(UV-Vis DRS). At the same time, taking the Xenon lamp as the visible light source for simulation and methylene blue as the degradation target, the photoelectrocatalytic activity of the prepared nanofibers was investigated. The results show that the coaxial ZnO/Ag₂O nanofibers have a shell-like structure(ZnO shell, Ag₂O core). Ag₂O and ZnO form heterojunction and impurity levels, which not only reduces the band gap energy of ZnO, but also improves the utilization of visible light. Compared with pure ZnO, ZnO/Ag₂O has stronger photoelectrocatalytic ability under visible light, and the amount of Ag₂O has a great influence on the photoelectrocatalytic activity of coaxial fiber. Under the same photoelectric catalytic condition, ZnO/Ag₂O-7 displayed the highest photoelectric activity, showing a high degradation rate of 93%, and its maximum kinetic constant is 1.13×10 ^-2 min ^-1. It is attributed to the lowest recombination rate of photogenerated electron-hole pairs.

Key words: Heterojunction, Coaxial nanofibers, Photoelectrocatalytic activity

CLC Number:

O643

TrendMD:

HAN Zhiying,LI Youji,CHEN Feitai,TANG Senpei,WANG Peng. Preparation of ZnO/Ag₂O Nanofibers by Coaxial Electrospinning and Study of Their Photocatalytic Properties ^†[J]. Chem. J. Chinese Universities, 2020, 41(2): 308.

Figures/Tables 13

Fig.1 Schematic of the fabrication of coaxial fibers/FTO by electrospinning

Fig.2 Schematic illustration of photoelectrocatalytic degradation apparatus

Fig.3 TG-DTA curves of ZnO/Ag2O-7 precursor coaxial fibers

Fig.4 XRD patterns of ZnO(a), ZnO/Ag2O-3(b), ZnO/Ag2O-5(c), ZnO/Ag2O-7(d) and ZnO/Ag2O-11(e)

Fig.5 SEM images of ZnO(A, C) and ZnO/Ag2O-7(B, D) precursor fibers(A, B) and calcined fibers(C, D)

Fig.6 SEM image(A), O(B), Ag(C) and Zn(D) elemental mapping images of ZnO/Ag2O-7

Fig.7 TEM and HRTEM(inset) images of ZnO/Ag2O-7

Fig.8 Raman spectra of pure ZnO/Ag2O-7(a) and ZnO(b)

Fig.9 XPS spectra of ZnO and ZnO/Ag2O-7 (A) Survey; (B) Zn2p; (C) Ag3d; (D) O1s.

Fig.10 UV-Vis DRS spectra(A) and determination of the band gap energy(B) of ZnO, ZnO/Ag2O-3, ZnO/Ag2O-5, ZnO/Ag2O-7 and ZnO/Ag2O-11

Fig.11 PL spectra of ZnO, ZnO/Ag2O-3, ZnO/Ag2O-5, ZnO/Ag2O-7 and ZnO/Ag2O-11

Fig.12 UV-Vis absorption spectra of catalytic degradation of MB with ZnO/Ag2O-7 as catalyst(A) and photoelectrocatalysis kinetics of MB degradation under Visiblelight irradiation with ZnO, ZnO/Ag2O-3, ZnO/Ag2O-5, ZnO/Ag2O-7 or ZnO/Ag2O-11 as catalyst(B)

Fig.13 Schematic diagram for the potential photocatalytic mechanismof ZnO/Ag2O

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Preparation of ZnO/Ag₂O Nanofibers by Coaxial Electrospinning and Study of Their Photocatalytic Properties ^†

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