Issue 7, 2015

Preparation of network-like ZnO–FeWO4 mesoporous heterojunctions with tunable band gaps and their enhanced visible light photocatalytic performance

Abstract

Novel mesoporous ZnO–FeWO4 (Zn–FeWO4) heterojunctions with network-like structure were synthesized with a combination of thermal decomposition and hydrothermal methods. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), N2 sorption and Brunauer–Emmett–Teller (BET) surface area analysis, diffuse reflection spectroscopy (DRS) and photoluminescence spectroscopy (PL). The results showed that the size of FeWO4 was reduced by the modification of ZnO. With the increasing molar ratio of ZnO to FeWO4, the quantum size of FeWO4 decreased from 11 nm to 4 nm, as is followed by a surprisingly band gap broadening. Photocatalytic activity toward the degradation of RhB under visible light irradiation was investigated. The optimum decomposition rate of RhB using the prepared 1.5Zn–FeWO4 heterojunction was almost 39 and 9.7 times that of pristine ZnO and FeWO4, respectively. The active species trapping experiments showed that the holes exhibited an obvious influence on the photocatalytic degradation process. The study on the mechanism showed that the enhanced photocatalytic activity was mainly ascribed to heterojunction construction and band gap broadening, which enhance the efficient transfer and the oxidation potential of holes. This heterojunction shows a potential industrial application to remove undesirable organics from the environment.

Graphical abstract: Preparation of network-like ZnO–FeWO4 mesoporous heterojunctions with tunable band gaps and their enhanced visible light photocatalytic performance

Supplementary files

Article information

Article type
Paper
Submitted
12 Apr 2015
Accepted
17 May 2015
First published
18 May 2015

New J. Chem., 2015,39, 5612-5620

Author version available

Preparation of network-like ZnO–FeWO4 mesoporous heterojunctions with tunable band gaps and their enhanced visible light photocatalytic performance

Y. Ma, Y. Guo, H. Jiang, D. Qu, J. Liu, W. Kang, Y. Yi, W. Zhang, J. Shi and Z. Han, New J. Chem., 2015, 39, 5612 DOI: 10.1039/C5NJ00900F

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