4.7 Article

Heterostructured ZnFe2O4/TiO2L nanotube arrays with remarkable visible-light photoelectrocatalytic performance and stability

Journal

JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 493, Issue -, Pages 198-205

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.01.023

Keywords

ZnFe2O4; TiO2 nanotube arrays; Methyl orange; Photoelectrocatalytic degradation

Funding

  1. National Natural Science Foundation of China [51508420, 51308421]
  2. Guangdong Provincial Natural Science Foundation of China [2015A030313641]
  3. Guangdong Provincial Education Department Supporting Program of China [2014KTSCX133]
  4. Thousand-Hundred-Ten Talents training Plan of Guangdong Province [S20143558425]
  5. Youth Science Foundation of Wuyi University [2014ZK03]
  6. Iowa State University (ISU) President's Initiative on Interdisciplinary Research (PIIR) program
  7. McGee-Wagner Interdisciplinary Research Foundation

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A series of heterostructured ZnFe2O4/TiO2-nanotube arrays (NTAs) with remarkable visible-light photoelectrocatalytic (PEC) activity were successfully prepared via a two-step process of anodization and impregnation, followed by annealing. The structure and morphology of the as-prepared ZnFe2O4/TiO2-NTAs samples, PEC degradation abilities and photoelectrochemical performances, as well as longterm stabilities toward degradation of methyl orange (MO) solution under visible-light irradiation were deeply investigated. Results showed that forming a heterojunction by combination of TiO2-NTAs with ZnFe2O4 successfully extended the absorption edge of TiO2-NTAs to visible-light region. Among all the ZnFe2O4/TiO2-NTAs samples, the 2-ZnFe2O4/TiO2-NTAs sample, named ZT(2), obtained the best PEC activity and the highest photocurrent density under visible-light irradiation. Moreover, the ZT(2) sample retained a good reproducibility and high stability after 20 days of PEC degradation. The outstanding visible-light PEC activity and photocurrent response of the ZT(2) sample were attributed to the proper amount of ZnFe2O4 nanoparticles loaded onto the TiO2-NTAs, which not only dramatically improved the visible-light absorption of TiO2-NTAs, but also assisted the separation of photo-induced electron hole pairs and reduced their recombination by forming a ZnFe2O4/TiO2-NTAs heterojunction. The reaction mechanism responsible for the enhanced visible-light PEC performance of the ZnFe2O4/TiO2-NTAs heterostructure was also discussed. (C) 2017 Elsevier Inc. All rights reserved.

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