Journal
NANO-MICRO LETTERS
Volume 10, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-017-0169-x
Keywords
Titanium dioxide nanotube arrays; Zinc ferrites nanocrystals; Pseudobrookite; Photocatalysis; Methylene blue; Heterojunction
Funding
- National Nature Science Foundation of China [51402247, 41630646]
- Sichuan Province Education Department Innovation Team Foundation [16zd1104]
- Sichuan Province Science Foundation for Young Scientists [15zs2111]
- Open Project of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials [13zxfk11]
- Doctoral Research Foundation of Southwest University of Science and Technology [14zx7119]
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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 voltageassisted 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 degrees 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 [GRAPHICS] 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.
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