Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity
Novel porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 p-n heterostructures were synthesized by partially decomposing porous Bi 2 O 2 CO 3 at 300-375 °C. The structures, morphologies, optical properties, and specific surface areas of the as-synthesized samples were characterized by means of thermogravimetry and dif...
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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11440546_v39_n12_p9557_Zhu http://hdl.handle.net/20.500.12110/paper_11440546_v39_n12_p9557_Zhu |
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paper:paper_11440546_v39_n12_p9557_Zhu2023-06-08T16:09:15Z Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity methyl orange methylene blue phenol absorption adsorption Article catalysis catalyst chemical model chemical structure crystal structure decomposition differential scanning calorimetry electrochemical analysis light molecular mechanics photodegradation pollutant priority journal scanning electron microscopy surface area synthesis temperature dependence thermal analysis thermogravimetry ultraviolet spectroscopy X ray diffraction X ray photoelectron spectroscopy Novel porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 p-n heterostructures were synthesized by partially decomposing porous Bi 2 O 2 CO 3 at 300-375 °C. The structures, morphologies, optical properties, and specific surface areas of the as-synthesized samples were characterized by means of thermogravimetry and differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, and N 2 gas adsorption. Two types of dyes, methyl orange (MO) and methylene blue (MB), were chosen as model organic pollutants to evaluate the photocatalytic activity of the as-synthesized samples. The porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 p-n heterostructures exhibited much higher photocatalytic activity than β-Bi 2 O 3 and Bi 2 O 2 CO 3 and MO and MB could be completely degraded within 24 and 50 min, respectively. In addition, phenol as a colorless organic pollutant was also chosen to further study the photocatalytic activity of Bi 2 O 2 CO 3 , β-Bi 2 O 3 and β-Bi 2 O 3 /Bi 2 O 2 CO 3 . The β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructures also showed much higher photocatalytic activity for the photodegradation of phenol than β-Bi 2 O 3 and Bi 2 O 2 CO 3 . The obtained results indicated that the formed p-n heterojunction in the porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 composite significantly contributed to the improvement of electron-hole separation and the enhancement of photocatalytic activity. The mechanisms for the enhanced photodegradation of selected organic pollutants over the β-Bi 2 O 3 /Bi 2 O 2 CO 3 composite are discussed in this study. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11440546_v39_n12_p9557_Zhu http://hdl.handle.net/20.500.12110/paper_11440546_v39_n12_p9557_Zhu |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
methyl orange methylene blue phenol absorption adsorption Article catalysis catalyst chemical model chemical structure crystal structure decomposition differential scanning calorimetry electrochemical analysis light molecular mechanics photodegradation pollutant priority journal scanning electron microscopy surface area synthesis temperature dependence thermal analysis thermogravimetry ultraviolet spectroscopy X ray diffraction X ray photoelectron spectroscopy |
| spellingShingle |
methyl orange methylene blue phenol absorption adsorption Article catalysis catalyst chemical model chemical structure crystal structure decomposition differential scanning calorimetry electrochemical analysis light molecular mechanics photodegradation pollutant priority journal scanning electron microscopy surface area synthesis temperature dependence thermal analysis thermogravimetry ultraviolet spectroscopy X ray diffraction X ray photoelectron spectroscopy Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity |
| topic_facet |
methyl orange methylene blue phenol absorption adsorption Article catalysis catalyst chemical model chemical structure crystal structure decomposition differential scanning calorimetry electrochemical analysis light molecular mechanics photodegradation pollutant priority journal scanning electron microscopy surface area synthesis temperature dependence thermal analysis thermogravimetry ultraviolet spectroscopy X ray diffraction X ray photoelectron spectroscopy |
| description |
Novel porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 p-n heterostructures were synthesized by partially decomposing porous Bi 2 O 2 CO 3 at 300-375 °C. The structures, morphologies, optical properties, and specific surface areas of the as-synthesized samples were characterized by means of thermogravimetry and differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, and N 2 gas adsorption. Two types of dyes, methyl orange (MO) and methylene blue (MB), were chosen as model organic pollutants to evaluate the photocatalytic activity of the as-synthesized samples. The porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 p-n heterostructures exhibited much higher photocatalytic activity than β-Bi 2 O 3 and Bi 2 O 2 CO 3 and MO and MB could be completely degraded within 24 and 50 min, respectively. In addition, phenol as a colorless organic pollutant was also chosen to further study the photocatalytic activity of Bi 2 O 2 CO 3 , β-Bi 2 O 3 and β-Bi 2 O 3 /Bi 2 O 2 CO 3 . The β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructures also showed much higher photocatalytic activity for the photodegradation of phenol than β-Bi 2 O 3 and Bi 2 O 2 CO 3 . The obtained results indicated that the formed p-n heterojunction in the porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 composite significantly contributed to the improvement of electron-hole separation and the enhancement of photocatalytic activity. The mechanisms for the enhanced photodegradation of selected organic pollutants over the β-Bi 2 O 3 /Bi 2 O 2 CO 3 composite are discussed in this study. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. |
| title |
Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity |
| title_short |
Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity |
| title_full |
Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity |
| title_fullStr |
Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity |
| title_full_unstemmed |
Thermodecomposition synthesis of porous β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterostructured photocatalysts with improved visible light photocatalytic activity |
| title_sort |
thermodecomposition synthesis of porous β-bi 2 o 3 /bi 2 o 2 co 3 heterostructured photocatalysts with improved visible light photocatalytic activity |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_11440546_v39_n12_p9557_Zhu http://hdl.handle.net/20.500.12110/paper_11440546_v39_n12_p9557_Zhu |
| _version_ |
1768546599076626432 |