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Vol. 10 No. 1 (2018)

Heterostructured ZnFe2O4/Fe2TiO5/TiO2 Composite Nanotube Arrays with an Improved Photocatalysis Degradation Efficiency Under Simulated Sunlight Irradiation

https://doi.org/10.1007/s40820-017-0169-x
Kun Xiong
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
Kunzhou Wang
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
Lin Chen
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
Xinqing Wang
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
Qingbo Fan
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
Je´re´mie Courtois
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
Yuliang Liu
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China
Xianguo Tuo
Sichuan University of Science and Engineering, Zigong 643000, People’s Republic of China
Minhao Yan
State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials, Southwest University of Science and Technology, Mianyang 621010, People’s Republic of China

Corresponding Author: Minhao Yan

yanminhao@swust.edu.cn

Nano-Micro Letters, Vol. 10 No. 1 (2018), Article Number: 17

Abstract

To improve the visible light absorption and photocatalytic activity of titanium dioxide nanotube arrays (TONTAs), ZnFe2O4 (ZFO) nanocrystals were perfused into pristine TONTA pipelines using a novel bias voltage-assisted perfusion method. ZFO nanocrystals were well anchored on the inner walls of the pristine TONTAs when the ZFO suspensions (0.025 mg mL−1) were kept under a 60 V bias voltage for 1 h. After annealing at 750 °C for 2 h, the heterostructured ZFO/Fe2TiO5 (FTO)/TiO2 composite nanotube arrays were successfully obtained. Furthermore, Fe3+ was reduced to Fe2+ when solid solution reactions occurred at the interface of ZFO and the pristine TONTAs. Introducing ZFO significantly enhanced the visible light absorption of the ZFO/FTO/TONTAs relative to that of the annealed TONTAs. The coexistence of type I and staggered type II band alignment in the ZFO/FTO/TONTAs facilitated the separation of photogenerated electrons and holes, thereby improving the efficiency of the ZFO/FTO/TONTAs for photocatalytic degradation of methylene blue when irradiated with simulated sunlight.


Highlights:


1 ZnFe2O4 nanocrystals were perfused into pristine TiO2 nanotube array pipelines using a novel bias voltage-assisted perfusion method.
2 Novel heterostructured ZnFe2O4/Fe2TiO5/TiO2 composite nanotube arrays were obtained with staggered type II band alignment at the ZnFe2O4/Fe2TiO5 interface and type I band alignment at the Fe2TiO5/TiO2 interface.
3 Visible light absorption and the photocatalytic degradation efficiency of methylene blue were significantly improved upon irradiation with simulated sunlight.

Keywords

Titanium dioxide nanotube arrays Zinc ferrites nanocrystals Pseudobrookite Photocatalysis Methylene blue Heterojunction
Xiong, Kun, Kunzhou Wang, Lin Chen, Xinqing Wang, Qingbo Fan, Je´re´mie Courtois, Yuliang Liu, Xianguo Tuo, and Minhao Yan. 2017. “Heterostructured ZnFe2O4/Fe2TiO5/TiO2 Composite Nanotube Arrays With an Improved Photocatalysis Degradation Efficiency Under Simulated Sunlight Irradiation”. Nano-Micro Letters 10 (1):17. https://doi.org/10.1007/s40820-017-0169-x.
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