Solvothermal synthesis and photocatalytic activity of Al-doped BiOBr microspheres

Liu, Zhangsheng; Wu, BianTao; Zhao, Yulong; Niu, Jinghui; Zhu, Yabo

doi:10.1016/j.ceramint.2013.10.152

Cited by 75 publications

(26 citation statements)

References 28 publications

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“…[27][28][29][30] To date, various experiments have been reported, some metal ions (e.g., Zn and Fe) or nonmetal (e.g., B and C) doped BiOBr photocatalysts were successfully prepared [31][32][33][34][35] and exhibited good photocatalytic performance, which mainly attributed to several aspects, e.g. impurity energy level introduced into the energy band, internal electric eld tuning and capture traps generated for electrons and holes.…”

Section: -26mentioning

confidence: 99%

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

et al. 2017

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In this work, Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets, which acted as a photocatalyst with excellent photocatalytic activity and stability, have been successfully synthesized through a simple two-step hydrothermal method. The related properties of the as-prepared photocatalyst were analyzed and a possible reaction mechanism was proposed. Incorporating the rareearth element Er into the BiOBr crystal lattice can greatly expand the optical window, maybe owing to the reduced energy band gap by the impurity energy level introduced below the conduction band and indirect utilization of long-wavelength visible light caused by the up-conversion performance. The wrapping with surface graphene nanosheets can efficiently promote charge separation and transmission over the hybrid photocatalyst. The synergistic effect between efficient solar energy harvesting and charge separation gives rise to a remarkable improvement of photocatalytic activity for RhB degradation under simulated sunlight irradiation. In addition, the as-prepared photocatalyst possesses excellent photocatalytic stability, mainly due to the robust coordination interaction between the graphene and the (001) facets of the BiOBr subunits. The rational design of this highly active and stable photocatalyst provides a promising approach for future applications.

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Section: -26mentioning

confidence: 99%

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

et al. 2017

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“…[28][29][30][31][32] The n value is determined by the type of optical transition characteristics of a semiconductor (n ¼ 1 for direct transition and n ¼ 4 for indirect transition). [28][29][30][31][32] The n value is determined by the type of optical transition characteristics of a semiconductor (n ¼ 1 for direct transition and n ¼ 4 for indirect transition).…”

Section: Resultsmentioning

confidence: 99%

“…Numerous semiconductors with narrow band gap have recently been studied as visible light harvesting photocatalysts. Up to date, some strategies have been carried out, which includes the controlling synthesis of BiOX with specic morphology and structure, [12][13][14][15][16] constructing BiOX-based composites with other semiconductors (such as TiO 2 , 17 ZnO, 18 27 ) and doping with metal atoms [28][29][30][31][32] (such as Ag, Al, Fe, Ti, Mn). [4][5][6][7][8] All of the BiOX crystallize in the tetragonal matlockite structure comprising of [Bi 2 O 2 ] 2+ slabs interleaved by double slabs of halogen atoms.…”

Section: Introductionmentioning

confidence: 99%

Controllable in situ synthesis of BiOBr_xI_1−x solid solution on reduced graphene oxide with enhanced visible light photocatalytic performance

et al. 2015

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Novel composite photocatalysts, BiOBr x I 1Àx -rGO, were facilely prepared by in situ controllable deposition of BiOBr x I 1Àx solid solutions onto the surface of graphene oxide which was then reduced at mild conditions. The high-resolution transmission electron microscopy results revealed an intimate interface between BiOBr x I 1Àx and rGO in the composites. The UV-vis diffuse reflectance spectra showed that BiOBr x I 1Àx -rGO composites had intense optical absorption in the visible light region. These excellent structural and spectral properties endowed BiOBr x I 1Àx -rGO composites with enhanced photocatalytic performance.Significantly, the BiOBr 0.6 I 0.4 -rGO sample exhibited the best photocatalytic activity for the photodegradation of methyl orange under visible light irradiation (l > 420 nm). The enhanced photocatalytic activity could be attributed to more effective charge separation and transportation, and increased light absorption. The radical trapping experiments confirmed that holes and superoxide radical species were the two main reactive species in the photocatalysis process. Moreover, this material exhibited great stability and durability, which retained more than 80% degradation after several cycles. À ) with strongly oxidizing property. It has been reported that graphene (or reduced graphene oxides, rGO) based composite photocatalysts, such as graphene/BiOBr, 43 graphene/ BiOI, 44 graphene/BiOBr 0.8 I 0.2 45 and graphene/BiOCl, 46 exhibited

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“…After V-doping, the surface states of the catalysts are greatly changed due to the size difference between Mo and V ions, and some oxygen vacancies can be expected to partially offset the lattice strain [30]. These oxygen vacancies give rise to the localized levels below the conduction edge.…”

Section: Uv-vis Spectra and Photocatalysismentioning

confidence: 99%

Synthesis, photocatalytic performance and negative thermal expansion property of nanorods ZrMo2−x V x O8−x/2 with cubic structure

Liu

Fan

Liu

et al. 2015

J Sol-Gel Sci Technol

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Cubic ZrMo 2-x V x O 8-x/2 (0 B x B 0.5) compounds, with well-defined nanorods morphology, were synthesized by a facile sol-gel process without using any surfactant or template. The resulting products were characterized by the X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermal mechanical analyzer and UV-vis diffuse reflectance spectra (UV-vis DRS). The results indicated that V-doping did not influence the crystal structure and negative thermal expansion (NTE) property, but made rods size increase. Narrowed band gap was observed in V-doped ZrMo 2 O 8 . The resultant V-doped ZrMo 2 O 8 samples, as compared with pure ZrMo 2 O 8 , exhibited improved UV-light photocatalytic activity, during the photocatalytic degradation of rhodamine B. The mechanism was supposed that the V-doping gave rise to the formation of oxygen vacancies which could enhance photocatalytic performance by reducing the recombination of electrons and holes. In addition, cubic ZrMo 2-x V x O 8-x/2 also displayed reliable recycling photocatalytic performance and satisfying UVlight catalytic activity for the organic pollutant. Furthermore, all of the resulting cubic ZrMo 2-x V x O 8-x/2 showed excellent NTE property from 25 to 450°C. Graphical Abstract TEM images of (a) pure ZrMo 2 O 8 and (b) ZrMo 1.7 V 0.3 O 7.85 ; (c) RhB degradation under UVlight illumination for 180 min in the presence of cubic ZrMo 2-x V x O 8-x/2 (x = 0, 0.1, 0.2, 0.3, 0.4 and 0.5) photocatalysts.

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Solvothermal synthesis and photocatalytic activity of Al-doped BiOBr microspheres

Cited by 75 publications

References 28 publications

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

Controllable in situ synthesis of BiOBr_xI_1−x solid solution on reduced graphene oxide with enhanced visible light photocatalytic performance

Synthesis, photocatalytic performance and negative thermal expansion property of nanorods ZrMo2−x V x O8−x/2 with cubic structure

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Solvothermal synthesis and photocatalytic activity of Al-doped BiOBr microspheres

Cited by 75 publications

References 28 publications

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

Efficient photocatalytic dye degradation over Er-doped BiOBr hollow microspheres wrapped with graphene nanosheets: enhanced solar energy harvesting and charge separation

Controllable in situ synthesis of BiOBrxI1−x solid solution on reduced graphene oxide with enhanced visible light photocatalytic performance

Synthesis, photocatalytic performance and negative thermal expansion property of nanorods ZrMo2−x V x O8−x/2 with cubic structure

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Controllable in situ synthesis of BiOBr_xI_1−x solid solution on reduced graphene oxide with enhanced visible light photocatalytic performance