Monoclinic α-Bi2O3 photocatalyst for efficient removal of gaseous NO and HCHO under visible light irradiation

Ai, Zhihui; Huang, Yu; Lee, Shuncheng; Zhang, Lizhi

doi:10.1016/j.jallcom.2010.10.132

Cited by 158 publications

(67 citation statements)

References 39 publications

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“…These peaks are attributed to monoclinic α-Bi2O3 and no traces of any other crystalline form are detected, meaning that the synthesized electrode surface is covered by pure α-Bi2O3. This result is generally in accordance with those reported in the literature, according to which, at temperatures higher than 500°C, the formation of α-Bi2O3 prevails [21,32]. As expected, the formation of Bi2O3 on the electrode surface significantly changed its morphology (Figures 4a and 4b).…”

Section: Characterization Of the Synthesized Electrodesupporting

confidence: 92%

“…Bi2O3 micro-particles deposited onto glassy carbon electrode have been successfully used as the electro-catalyst in the electrochemical oxidation of ascorbic acid [19]. It has also been applied as a photocatalyst for the removal of other compounds, such as some organic dyes and pigments, 4-chlorophenol and gaseous NO and HCHO [20][21][22][23][24][25]. Furthermore, Bi2O3 can be easily prepared and its starting materials are generally low-cost.…”

Section: Ho2• + H2o2→ •Oh + H2o + O2 Eq (3)mentioning

confidence: 99%

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Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

Petrović

Mitrović

Antonijević

et al. 2015

Materials Chemistry and Physics

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This paper reports the synthesis, characterization and application of a Ti-Bi2O3 anode for the electrochemical decolorization of the textile dye Reactive Red 2. The anode was synthesized by electrodeposition on a Ti substrate immersed in an acidic bismuth (III) solution at constant potential, followed by calcination in air at 600°C. Thermogravimetric Analysis (TGA), Energydispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analysis revealed that the electrodeposited material was predominantly metallic bismuth, which was oxidized to pure α-Bi2O3 during the calcination in air. SEM micrographs revealed that the Bi2O3 coat at the anode surface was inhomogeneous and porous. Reactive Red 2 was completely electrochemically decolorized at the synthesized anode in the presence of H2O2. The applied current density, H2O2 and Na2SO4 concentration, medium pH and initial dye concentration affected the dye decolorization rate. The optimal process parameters were found to be as follows: an applied current density of 40 mA cm -2 using a mixture of 10 mmol dm -3 H2O2 and 10 mmol dm -3 Na2SO4 at pH 7. The dye decolorization rate was shown to decrease as its initial concentration increased. The decolorization reactions were found to follow pseudo-first order kinetics.

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Section: Characterization Of the Synthesized Electrodesupporting

confidence: 92%

Section: Ho2• + H2o2→ •Oh + H2o + O2 Eq (3)mentioning

confidence: 99%

Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

Petrović

Mitrović

Antonijević

et al. 2015

Materials Chemistry and Physics

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“…In particular, works related to bismuth oxide (Bi 2 O 3 ) have doubled in the last decade, thus reflecting the scientific, technological, and industrial importance of this compound. Its peculiar properties, including a large energy gap, a high refractive index and dielectric permittivity, and good photoconductivity [1][2][3][4][5][6], have made Bi 2 O 3 suitable for a large range of applications, such as optical coatings, photovoltaic cells, microwave integrated circuits, fuel cells, oxygen sensors, oxygen pumps, and catalytic activity [3,[7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

β−Bi2O3under compression: Optical and elastic properties and electron density topology analysis

et al. 2016

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We report a joint experimental and theoretical study of the optical properties of tetragonal bismuth oxide (β-Bi 2 O 3 ) at high pressure by means of optical absorption measurements combined with ab initio electronic band structure calculations. Our results are consistent with previous results that show the presence of a second-order isostructural phase transition in Bi 2 O 3 (from β to β ) around 2 GPa and a phase transition above 15 GPa combined with a pressure-induced amorphization above 17-20 GPa. In order to further understand the pressure-induced phase transitions and amorphization occurring in β-Bi 2 O 3 , we theoretically studied the mechanical and dynamical stability of the tetragonal structures of β-and β -Bi 2 O 3 at high pressure through calculations of their elastic constants, elastic stiffness coefficients, and phonon dispersion curves. The pressure dependence of the elastic stiffness coefficients and phonon dispersion curves confirms that the isostructural phase transition near 2 GPa is of ferroelastic nature. Furthermore, a topological study of the electron density shows that the ferroelastic transition is not caused by a change in number of critical points (cusp catastrophe), but by the equalization of the electron densities of both independent O atoms in the unit cell due to a local rise in symmetry. Finally, from theoretical simulations, β -Bi 2 O 3 is found to be mechanically and dynamically stable at least up to 26.7 GPa under hydrostatic conditions; thus, the pressure-induced amorphization reported above 17-20 GPa in powder β -Bi 2 O 3 using methanol-ethanol-water as pressure-transmitting medium could be related to the frustration of a reconstructive phase transition at room temperature and the presence of mechanical or dynamical instabilities under nonhydrostatic conditions.

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“…Bi-based photocatalysts have attracted much attention owing to their excellent photocatalytic activity in organic compound decomposing [22][23][24][25], water splitting [26] and NO reducing [27][28][29]. Among these, BiOBr with a narrow band gap of 2.75 eV has proved to be an efficient visible light photocatalyst for widespread environmental application [30,31].…”

Section: Introductionmentioning

confidence: 99%

Reduced graphene oxide as co-catalyst for enhanced visible light photocatalytic activity of BiOBr

Jiang

Sun

et al. 2016

Ceramics International

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Monoclinic α-Bi2O3 photocatalyst for efficient removal of gaseous NO and HCHO under visible light irradiation

Cited by 158 publications

References 39 publications

Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

Synthesis and characterization of new Ti–Bi2O3 anode and its use for reactive dye degradation

β−Bi2O3under compression: Optical and elastic properties and electron density topology analysis

Reduced graphene oxide as co-catalyst for enhanced visible light photocatalytic activity of BiOBr

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