Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic Activity
Three-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specif...
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| Format: | Article |
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MDPI AG
2017-03-01
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| Series: | Nanomaterials |
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| Online Access: | http://www.mdpi.com/2079-4991/7/3/64 |
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| author | Yazi Liu Jian Xu Liqiong Wang Huayang Zhang Ping Xu Xiaoguang Duan Hongqi Sun Shaobin Wang |
| author_facet | Yazi Liu Jian Xu Liqiong Wang Huayang Zhang Ping Xu Xiaoguang Duan Hongqi Sun Shaobin Wang |
| author_sort | Yazi Liu |
| collection | DOAJ |
| description | Three-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specific surface area, X-ray photoelectron spectroscopy (XPS), and the UV-Vis diffuse reflectance spectra (DRS), the BiOI/BiOCl composites showed a fluffy and porous 3-D architecture with a large specific surface area (SSA) and high capability for light absorption. Among all the BiOX (X = Cl, Br, I) and BiOI/BiOX (X = Cl or Br) composites, BiOI/BiOCl stands out as the most efficient photocatalyst under both visible and UV light irradiations for methyl orange (MO) oxidation. The reaction rate of MO degradation on BiOI/BiOCl was 2.1 times higher than that on pure BiOI under visible light. Moreover, BiOI/BiOCl exhibited enhanced water oxidation efficiency for O2 evolution which was 1.5 times higher than BiOI. The enhancement of photocatalytic activity could be attributed to the formation of a heterojunction between BiOI and BiOCl, with a nanoporous structure, a larger SSA, and a stronger light absorbance capacity especially in the visible-light region. The in situ electron paramagnetic resonance (EPR) revealed that BiOI/BiOCl composites could effectively evolve superoxide radicals and hydroxyl radicals for photodegradation, and the superoxide radicals are the dominant reactive species. The superb photocatalytic activity of BiOI/BiOCl could be utilized for the degradation of various industrial dyes under natural sunlight irradiation which is of high significance for the remediation of industrial wastewater in the future. |
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| last_indexed | 2024-04-13T02:13:50Z |
| publishDate | 2017-03-01 |
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| series | Nanomaterials |
| spelling | doaj.art-94e1f87d8b0e43d380b3e2d5e6c414762022-12-22T03:07:12ZengMDPI AGNanomaterials2079-49912017-03-01736410.3390/nano7030064nano7030064Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic ActivityYazi Liu0Jian Xu1Liqiong Wang2Huayang Zhang3Ping Xu4Xiaoguang Duan5Hongqi Sun6Shaobin Wang7Department of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaSchool of Chemistry and Life Science, Nanjing University Jinling College, Nanjing 210089, ChinaState Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, ChinaDepartment of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaSchool of Chemistry and Life Science, Nanjing University Jinling College, Nanjing 210089, ChinaDepartment of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaSchool of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, WA 6027, AustraliaDepartment of Chemical Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaThree-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specific surface area, X-ray photoelectron spectroscopy (XPS), and the UV-Vis diffuse reflectance spectra (DRS), the BiOI/BiOCl composites showed a fluffy and porous 3-D architecture with a large specific surface area (SSA) and high capability for light absorption. Among all the BiOX (X = Cl, Br, I) and BiOI/BiOX (X = Cl or Br) composites, BiOI/BiOCl stands out as the most efficient photocatalyst under both visible and UV light irradiations for methyl orange (MO) oxidation. The reaction rate of MO degradation on BiOI/BiOCl was 2.1 times higher than that on pure BiOI under visible light. Moreover, BiOI/BiOCl exhibited enhanced water oxidation efficiency for O2 evolution which was 1.5 times higher than BiOI. The enhancement of photocatalytic activity could be attributed to the formation of a heterojunction between BiOI and BiOCl, with a nanoporous structure, a larger SSA, and a stronger light absorbance capacity especially in the visible-light region. The in situ electron paramagnetic resonance (EPR) revealed that BiOI/BiOCl composites could effectively evolve superoxide radicals and hydroxyl radicals for photodegradation, and the superoxide radicals are the dominant reactive species. The superb photocatalytic activity of BiOI/BiOCl could be utilized for the degradation of various industrial dyes under natural sunlight irradiation which is of high significance for the remediation of industrial wastewater in the future.http://www.mdpi.com/2079-4991/7/3/64BiOI/BiOClvisible lightphotocatalysisheterojunctiondegradationwater oxidation |
| spellingShingle | Yazi Liu Jian Xu Liqiong Wang Huayang Zhang Ping Xu Xiaoguang Duan Hongqi Sun Shaobin Wang Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic Activity Nanomaterials BiOI/BiOCl visible light photocatalysis heterojunction degradation water oxidation |
| title | Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic Activity |
| title_full | Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic Activity |
| title_fullStr | Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic Activity |
| title_full_unstemmed | Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic Activity |
| title_short | Three-Dimensional BiOI/BiOX (X = Cl or Br) Nanohybrids for Enhanced Visible-Light Photocatalytic Activity |
| title_sort | three dimensional bioi biox x cl or br nanohybrids for enhanced visible light photocatalytic activity |
| topic | BiOI/BiOCl visible light photocatalysis heterojunction degradation water oxidation |
| url | http://www.mdpi.com/2079-4991/7/3/64 |
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