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Preparation and characterization of heterojunction semiconductor YFeO3/TiO2 with an enhanced photocatalytic activity

Published online by Cambridge University Press:  31 January 2011

Xiaomeng Lū ,
Jun Liu ,
Jianjun Zhu ,
Deli Jiang  and
Jimin Xie
Jimin Xie
Affiliation:
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People’s Republic of China
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Abstract

YFeO3/TiO2 heterojunction semiconductors were prepared by the milling–annealing method. Effects of structure and surface phase by annealing temperature and TiO2 weight content were investigated. The physical and photophysical properties of heterojunction semiconductors were characterized by x-ray diffraction (XRD), UV-visible diffraction (UV-vis/DRS), and x-ray photoelectron spectroscopy (XPS), N2 adsorption. YFeO3 is presented as p-type semiconductor and disperses on the surface of n-type TiO2 to constitute a heterojunction composite. Results show that the presence of p–n junction not only has visible light harvesting but potential force for hole–electron pair separation. A preliminary investigation of photodegradation effect on Orange II showed that YFeO3/TiO2 heterojunction semiconductors exhibited better photocatalytic properties than the single phase of YFeO3 or TiO2. The ideal heterojunction semiconductor composition was ω (TiO2) = 0.9 sample annealed at 600 °C. The mechanism of the electric-field-driven electron–hole separation initiated by the chemically bonded p–n heterojunction and enhanced photocatalytic activity were discussed.

Keywords

CrystallineNanostructurePhotochemical
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 1: Photocatalysis for Energy and Environmental Sustainability , January 2010 , pp. 104 - 109
Copyright
Copyright © Materials Research Society 2010

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