Effect of oxygen vacancy defect regeneration on photocatalytic properties of ZnO nanorods
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Effect of oxygen vacancy defect regeneration on photocatalytic properties of ZnO nanorods Fucheng Yu1 · Zhengyan Liu1 · Yuanmeng Li1 · Dongmei Nan1 · Bolong Wang1 · Ling He1 · Jianbin Zhang1 · Xianxi Tang1 · Hongyan Duan1 · Yangshuo Liu2 Received: 5 August 2020 / Accepted: 28 October 2020 / Published online: 10 November 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effect of oxygen vacancy ( VO) defect regeneration in ZnO nanorods on their photocatalytic properties has been investigated. The ZnO nanorods with different VO defect concentrations were realized by the annealing in the different atmospheres of vacuum, oxygen, air and Ar. And the V O defect concentrations in the annealed ZnO nanorods follow an order of Cvacuum > CAr > Cair > Coxygen. By the photocatalytic degradation test to methyl orange solution (MO), the photocatalytic performance of the samples is in accordance with the order of VO defect concentration in the samples, that is, the photocatalytic performance of ZnO nanorods increases with the increase of VO defect concentration, and the best performance is achieved in the sample annealed in the vacuum atmosphere due to the highest VO defect concentration. The regeneration ability of VO defects in ZnO nanorods was studied through the oxygen-deficit atmosphere annealing after each cyclic photocatalytic test. Although the photocatalytic performance of ZnO nanorods degrades slightly with the increase of cyclic test numbers, the VO defects regenerated sample still shows excellent photocatalytic performance after three cyclic tests. The results show that the VO defects in ZnO nanorods play a key role in improving the photocatalytic degradation performance, and the V O defects regenerated ZnO nanorods still show good photocatalytic degradation performance, indicating that ZnO can be reused as a photocatalyst by the VO defect regeneration. Keywords ZnO nanorods · Oxygen vacancy defects · Photocatalysis · Defect regeneration
1 Introduction Recently, photocatalytic degradation technology has attracted a lot of attention due to its advantages in water purification, such as the utilization of green solar energy,
high efficiency and complete degradation. As an efficient photocatalyst, ZnO has attracted more and more attention in recent years [1]. ZnO has many excellent physical properties, like high exciton binding energy, high transparency, and morphological diversity, including spherical [2, 3], flower
* Fucheng Yu [email protected]
Xianxi Tang [email protected]
Zhengyan Liu [email protected]
Hongyan Duan [email protected]
Yuanmeng Li [email protected]
Yangshuo Liu [email protected]
Dongmei Nan [email protected]
1
Bolong Wang [email protected]
School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, P. R. China
2
Hubei Key Laboratory of Biomass Fibers and Eco‑Dyeing and Finishing, Wuhan Textile University, Wuhan 430073, P. R. China
Ling He [email protected] Jianbin Zhang jbzhangjb@hotma
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