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

详细信息    查看全文

• 作者：Haibo Feng^a ; ^b ; Yaping Li^a ; Dongming Luo^a ; Gongrong Tan^a ; Jianbo Jiang^a ; Huimin Yuan^a ; Sanjun Peng^a ; Dong Qian^a ; ^b ; ^{qiandong6@vip.sina.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Indium orthovanadate ; Cuprous oxide ; Titanium dioxide ; Nanoheterostructure ; Visible light ; Photocatalytic degradation ; Methyl orange
• 刊名：Chinese Journal of Catalysis
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：37
• 期：6
• 页码：855-862
• 全文大小：936 K

文摘

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.