Synthesis, characterization, and activities of visible light-driven Bi2O3–TiO2 composite photocatalysts

Liu, Yuande; Feng, Xin; Wang, Fumin; Luo, Shanxia; Yin, Xiaohong

doi:10.1016/j.jallcom.2010.03.151

Cited by 127 publications

(45 citation statements)

References 27 publications

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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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Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…However, TiO 2 could only respond to UV irradiation that takes up ∼4% of solar energy, which limits the application to a great extent. In the past decades, numerous methods have been developed to increase the photocatalytic efficiency of TiO 2 , such as doping of TiO 2 with metallic (Cr, Fe, V) [7,8], and nonmetallic elements (N, C, B) [9,10] to increase the visible light absorbance, and coupling with other semiconductors [11][12][13] to increase the separation efficiency of photogenerated electron -hole pairs during photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

TiO2–g-C3N4 composite materials for photocatalytic H2 evolution under visible light irradiation

Yan

Yang

2011

Journal of Alloys and Compounds

525

227

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“…In addition, high recombination rate of photoinduced hole-electron pairs is another factor limiting its practical applications. As a result, abundant efforts have been devoted to advance TiO 2 through structural modifications with metallic [4,5], nonmetallic elements [6,7], and other semiconductors [8,9], aiming to produce photocatalysts with both merits of visible light response and efficient separation of hole-electron pairs.…”

Section: Introductionmentioning

confidence: 99%

Fabrication, characterization, and photocatalytic performance of exfoliated g-C3N4–TiO2 hybrids

Chang

Zhang

Xie

et al. 2014

Applied Surface Science

183

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a b s t r a c tA series of TiO 2 hybrids composited with exfoliated g-C 3 N 4 nanosheets (CNs) were successfully synthesized through a facile sol-gel method and fully characterized by X-ray diffraction patterns (XRD), Fourier transform-infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectra (UV-vis DRS). The CNs-TiO 2 hybrids were exposed to visible light irradiation and showed much higher catalytic capability toward degrading dye rhodamine B (RhB) comparing with bare TiO 2 and N-TiO 2 . The sample CNs-TiO 2 -0.05 exhibited the largest apparent reaction rate constant among all CNs-TiO 2 hybrids, which was 2.4 times and 7.0 times as high as bare TiO 2 and N-TiO 2 , respectively. The enhanced catalytic efficiency could be mainly attributed to the well-matched band gap structure with heterojunction interface, suitable specific surface area, and favorable optical property. In addition, active species trapping experiments were conducted, revealing that photoinduced holes (h + ) had a severe influence on catalytic outcome, through which a possible catalytic mechanism was finally realized and proposed.

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Synthesis, characterization, and activities of visible light-driven Bi2O3–TiO2 composite photocatalysts

Cited by 127 publications

References 27 publications

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

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

TiO2–g-C3N4 composite materials for photocatalytic H2 evolution under visible light irradiation

Fabrication, characterization, and photocatalytic performance of exfoliated g-C3N4–TiO2 hybrids

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