22September2020

Nano-Micro Letters

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

Kun Xiong1, ┴, Kunzhou Wang1, ┴, Lin Chen1, Xinqing Wang1, Qingbo Fan1, Jérémie Courtois1, Yuliang Liu1, Xianguo Tuo2, *, Minhao Yan1, *

Abstract
icon-htmlFull Text Html
icon-pdf-smPDF w/ Links
icon-citExport Citation
Figures
+Show more

Nano-Micro Lett. (2018) 10: 17

First Online: 20 October 2017 (Article)

DOI:10.1007/s40820-017-0169-x

*Corresponding author. E-mail: yanminhao@swust.edu.cn ; tuoxianguo@suse.edu.cn

 

Abstract

 


Fig. 9 Schematic of the energy band structure of a the ZFO/FTO/TONTAs heterojunction, b type-I band alignment, and c type-2 and alignment

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 co-existence 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.


 

Keywords

Titanium dioxide nanotube arrays; Zinc ferrites nanocrystals; Pseudobrookite; Photocatalysis; Methylene blue; Heterojunction

View: Full Text HTML | PDF w/ Links