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Preparation and visible-light photocatalyst activity of nanometric-sized TiO2-xNy powders from a two-microemulsion process

Published online by Cambridge University Press:  31 January 2011

Wein-Duo Yang ,
Wen-Chung Lin ,
Chunhui Yang ,
Zen-Ja Chung  and
I-Lun Huang
Wein-Duo Yang*
Affiliation:
Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan, Republic of China
Wen-Chung Lin
Affiliation:
Department of Environmental Engineering, Kun Shan University, Tainan 710, Taiwan, Republic of China
Chunhui Yang
Affiliation:
Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Zen-Ja Chung
Affiliation:
Chemical Engineering Division, Institute of Nuclear Energy Research, Lungtan, Taoyuan 325, Taiwan, Republic of China
I-Lun Huang
Affiliation:
Department of Chemical and Materials Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, Taiwan, Republic of China
*
a) Address all correspondence to this author. e-mail: ywd@cc.kuas.edu.tw
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Abstract

Nanometric-sized nitrogen-doped titanium oxide (TiO2-xNy) powders were synthesized by the two-microemulsion technology. The dried precursor precipitate was characterized by differential thermal analysis/thermogravimetric analysis, Raman spectroscopy, transmission electron microscopy, Brunauer-Emmet-Teller, and x-ray photoelectron spectrometer (XPS), and the mechanisms for the evolution of TiO2-xNy powders in this process were proposed and discussed in the context of the microstructure. It shows that a higher pH value solution results in obtaining a small size and much more homogeneous TiO2-xNy powder after calcinations. The powder prepared from a solution of pH 10–11 and calcined at 500 °C has a particle size of ∼4–6 nm with a specific surface area of 160 m2/g and exhibits a pure phase of anatase containing ∼5 mol% of N evidenced by XPS. However, the nanometric-sized TiO2-xNy powder shows the photocatalytic degradation of methylene blue solution effectively by exposing the powders in aqueous solution under visible light.

Keywords

Chemical synthesisDifferential thermal analysis (DTA)Nanoscale
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 8 , August 2009 , pp. 2574 - 2583
Copyright
Copyright © Materials Research Society 2009

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