Citation: CHEN Ai-Min, BO Ying-Ying, SHAO Chen-Yi, WANG Jing, HU Jun. Synthesis of Single-Crystalline Cu₃B₂O₆/CuB₂O₄ and Their Photocatalytic Degradation of Methylene Blue under Visible-Light Irradiation[J]. Acta Physico-Chimica Sinica, ;2014, 30(9): 1713-1719. doi: 10.3866/PKU.WHXB201407011 shu

Synthesis of Single-Crystalline Cu₃B₂O₆/CuB₂O₄ and Their Photocatalytic Degradation of Methylene Blue under Visible-Light Irradiation

1.
College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China

Received Date: 23 April 2014
Available Online: 1 July 2014
Fund Project:

Single-crystalline Cu₃B₂O₆/CuB₂O₄ was successfully prepared by a sol-gel method fromcupric nitrate/ cupric acetate and boric acid, using citric acid as a foaming agent. The obtained materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and thermogravimetry-differential thermal analysis (TG-DTA). The photodegradation of methylene blue (MB) solution was used to evaluate the photocatalytic activity of Cu₃B₂O₆/CuB₂O₄ under visiblelight irradiation (400 nm<λ<1100 nm). The results indicated that both Cu₃B₂O₆ and CuB₂O₄ displayed od photocatalytic activity. Under visible-light irradiation for 6 h, the photocatalytic activities of CuB₂O₄ and Cu₃B₂O₆ reached 63.36% and 99.52%, respectively, in MB aqueous solution (50 mg·L^-1) containing 1 g·L^-1 catalyst. Ultraviolet-visible analysis showed that the width of the midgap state for Cu₃B₂O₆ is 1.78 eV, which is much narrower than that of CuB₂O₄ (1.95 eV), and the band gap of Cu₃B₂O₆ is narrow (E_g=2.34 eV). These results indicated that electron transitions can occur in both the midgap state and forbidden band for Cu₃B₂O₆; this is why Cu₃B₂O₆ has higher visible-light photocatalytic activity than CuB₂O₄.
- Sol-gel,
- Copper borate,
- Visible-photocatalysis,
- Methylene blue
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Synthesis of Single-Crystalline Cu3B2O6/CuB2O4 and Their Photocatalytic Degradation of Methylene Blue under Visible-Light Irradiation

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Synthesis of Single-Crystalline Cu₃B₂O₆/CuB₂O₄ and Their Photocatalytic Degradation of Methylene Blue under Visible-Light Irradiation