Citation: Haibo Feng, Yaping Li, Dongming Luo, Gongrong Tan, Jianbo Jiang, Huimin Yuan, Sanjun Peng, Dong Qian. Novel visible-light-responding InVO₄-Cu₂O-TiO₂ ternary nanoheterostructure: Preparation and photocatalytic characteristics[J]. Chinese Journal of Catalysis, ;2016, 37(6): 855-862. doi: 10.1016/S1872-2067(15)61105-6 shu

Novel visible-light-responding InVO₄-Cu₂O-TiO₂ ternary nanoheterostructure: Preparation and photocatalytic characteristics

a College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China;
b State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Hunan, China

Received Date: 31 January 2016
Revised Date: 13 April 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21171174), Provincial Natural Science Foundation of Hunan (09JJ3024), and Provincial Environmental Science and Technology Foundation of Hunan.

A novel visible-light-responding InVO₄-Cu₂O-TiO₂ ternary nanoheterostructure was designed on the basis of the strategy of energy gap engineering and prepared through ordinary wet chemistry methods. The as-prepared nanoheterostructure was characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and diffuse reflectance ultraviolet-visible spectroscopy (UV-vis/DRS). The TEM and HRTEM images of 10%InVO₄-40%Cu₂O-50%TiO₂ confirm the formation of nanoheterostructures resulting from contact of the nanosized TiO₂, Cu₂O and InVO₄ in the size of 5-20 nm in diameter. The InVO₄-Cu₂O-TiO₂ nanoheterostructure, when compared with TiO₂, Cu₂O, InVO₄, InVO₄-TiO₂ and Cu₂O-TiO₂, shows significant enhancement in the photocatalytic performance for the degradation of methyl orange (MO) under visible-light irradiation. With a 9 W energy-saving fluorescent lamp as the visible-light source, the MO degradation rate of 10%InVO₄-40%Cu₂O-50%TiO₂ reaches close to 90% during 5 h, and the photocatalytic efficiency is maintained at over 90% after six cycles. This may be mainly ascribed to the matched bandgap configurations of TiO₂, Cu₂O and InVO₄, and the formations of two p-n junctions by the p-type semiconductor Cu₂O with the n-type semiconductors TiO₂ and InVO₄, all of which favor spatial photogenerated charge carrier separation. The X-ray photoelectron spectroscopy (XPS) characterization for the used 10%InVO₄-40%Cu₂O-50%TiO₂ reveals that only a small shakeup satellite peak appears for Cu(II) species, implying bearable photocorrosion of Cu₂O. This work could provide new insight into the design and preparation of novel visible-light-responding semiconductor composites.
- Indium orthovanadate,
- Cuprous oxide,
- Titanium dioxide,
- Nanoheterostructure,
- Visible light,
- Photocatalytic degradation,
- Methyl orange
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Novel visible-light-responding InVO₄-Cu₂O-TiO₂ ternary nanoheterostructure: Preparation and photocatalytic characteristics