Journal
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
Volume 43, Issue -, Pages 55-59Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mssp.2015.11.021
Keywords
TiO2 nanotube arrays; La2O3; Lanthanum doping; Photocatalytic activity; Visible-light
Categories
Funding
- Sichuan Education Department Foundation [15ZB0280]
- Applied Basic Research Program of Sichuan Province, China [2015JY0036]
Ask authors/readers for more resources
In this work, using a lanthanum nitrate solution as lanthanum source, a visible-light responsive La2O3/TiO2 nanotube arrays (TNTs) composite was synthesized by a facile impregnation-calcinations technique. The as-synthesized samples were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy and photocurrent tests. The photocatalytic activity of the La2O3/TNTs composite under visible -light irradiation (lambda > 420 nm) was evaluated by the degradation of Rhodamine B (RhB). The results revealed one part of La was doped, and the other part was dispersed on the TNTs surface in the form of La2O3. La-doping narrowed the band gap and La2O3 modification accelerated the separation of photo-induced electron-hole pairs. Consequently, the as-prepared La2O3/TNT5 composite exhibited much higher photocatalytic activity than pure TNTs. The photocatalytic activity of the composite was related to impregnation time of lanthanum nitrate solution, and an optimal time was 2 h. The activity of 2-La2O3/TNTs displayed 3.7 times as high as that of pure TNTs. A possible mechanism on the La2O3/TNTs photocatalytic activities is suggested. The composite, as promising materials, could be used to degrade dye wastewater or other organic pollutants. (C) 2015 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available