Photoreduction of CO2 on BiOCl nanoplates with the assistance of photoinduced oxygen vacancies

Zhang, Ling; Wang, Wenzhong; Jiang, Dong; Gao, Erping; Sun, Songmei

doi:10.1007/s12274-014-0564-2

Cited by 361 publications

(208 citation statements)

References 42 publications

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“…Thirdly, the exposed (000-1) facets terminated with a high density of oxygen atoms favor the formation of oxygen vacancies in the crystal lattice43. The oxygen vacancies enhance the efficient separation of electron-hole pairs and improve the trapping capability for CO 2 , thus improving the photoreduction activity of CO 2 4445; moreover, oxygen vacancies are more beneficial to the selective photoreduction of CO 2 into CO than CH 4 2746. In these regards, compared to S-2 and S-3, S-1 with more {0001} facets exhibits a higher photocatalytic activity, which can be further clarified by the CO 2 reduction activity of S-1, S-2, and S-3 (0.2065, 0.0975, and 0.1212 μmol m −2 h −1 , listed in Table 1).…”

Section: Discussionmentioning

confidence: 99%

Photocatalytic Reduction of CO2 by ZnO Micro/nanomaterials with Different Morphologies and Ratios of {0001} Facets

Liu

et al. 2016

Sci Rep

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ZnO microspheres, ZnO microflowers and ZnO nanorods are successfully synthesized via a convenient solvothermal method in distilled water-ethanol mixed medium. The as-prepared ZnO micro/nanomaterials are characterized by XRD, SEM, TEM, HRTEM, XPS, BET, and UV-Vis. The morphologies and exposed facets of the ZnO micro/nanomaterials can be controlled by simply changing the volume ratio of distilled water to ethanol, and their formation mechanisms are also proposed. In addition, the photocatalytic activities of the ZnO samples are investigated towards the photoreduction of CO2 to CO. It is found that ZnO nanorods with high ratio of {0001} facets and large surface areas possess higher CO formation rate (3.814 μmol g−1 h−1) in comparison with ZnO microspheres and ZnO microflowers (3.357 and 1.627 μmol g−1 h−1, respectively). The results can not only provide an important indication about the influence of the {0001} facets on the activity of CO2 photoreduction over ZnO, but also demonstrate a strategy for tuning the CO2 photoreduction performance by tailoring the surface structures of ZnO micro/nanomaterials.

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Section: Discussionmentioning

confidence: 99%

Photocatalytic Reduction of CO2 by ZnO Micro/nanomaterials with Different Morphologies and Ratios of {0001} Facets

Liu

et al. 2016

Sci Rep

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“…PMS can undergo direct ion exchange with Br atoms (−Br) (Equation (13), [14]) and complexation with Bi atoms in the [Bi 2 O 2 ] layer through substitution of −OH (Equation (14)). It has been reported that surface Bi(III) in BiOCl can be oxidized to a high-valence state [27]. Furthermore, the accumulation of bismuth ion in the solution as the reaction proceeds ( Figure 4) and promotion of CBZ degradation by homogeneous Bi(III) (Text S4 and Figure S7, Supplementary Materials) suggest that Bi(III) on the surface of BiOBr particles might be the active sites.…”

Section: Stability Of Biobr As a Pms Activatormentioning

confidence: 94%

“…As Figure 7a shows, there were two strong peaks (at 159.60 and 164.95 eV) in the Bi region, indicating that Bi(III) was present [30]. Peaks with higher binding energies at 159.69 and 159.77 eV (Figure 7b,c, respectively) can be attributed to Bi(III+x) ions (Bi(IV) or Bi(V)) [27]. The XPS data thus help to elucidate the possible electron-transfer reactions on the surface of the BiOBr particles (Equations (15)- (21)).…”

Section: Stability Of Biobr As a Pms Activatormentioning

confidence: 96%

Efficient Degradation of Aqueous Carbamazepine by Bismuth Oxybromide-Activated Peroxide Oxidation

Zhang

Chu

et al. 2017

Catalysts

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Bismuth oxyhalide, usually employed as a photocatalyst, has not been tested as an activator of peroxide for water purification. This work explores the potential application of bismuth oxyhalide (BiOX, X = Cl, Br, I)-activated peroxide (H 2 O 2 ; peroxymonosulfate (PMS) and peroxydisulfate) systems for the degradation of carbamazepine (CBZ) in water destined for drinking water. BiOBr showed the highest activity toward the peroxides investigated, especially toward PMS. The most efficient combination, BiOBr/PMS, was selected to further research predominant species responsible for CBZ degradation and toxicity of transformation products. With repeated use of BiOBr, low bismuth-leaching and subtle changes in crystallinity and activity were observed. CBZ degradation was primarily (67.3%) attributable to attack by sulfate radical. Toxicity test and identification of the oxidation products indicated some toxic intermediates may be produced. A possible degradation pathway is proposed. Besides substitution of the hydroxyl groups on the surface of the catalyst particles, PMS's complexation with the lattice Bi(III) through ion exchange with interlayer bromide ion was involved in the decomposition of PMS. The Bi(III)-Bi(V)-Bi(III) redox cycle contributed to the efficient generation of sulfate radicals from the PMS. Our findings provide a simple and efficient process to produce powerful radicals from PMS for refractory pollutant removal.

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“…In addition, ZnGa 2 O 4 nanocube with the exposed (100) or (110) facets [202,203], Bi 2 WO 6 square nanoplates with the exposed (001) surface [118], BiOCl nanoplates with oxygen vacancies [204], nanoplate-textured Zn 2 SnO 4 with the exposed (100) surface [205] and WO 3 nanosheets with the exposed (001) surface [111] were successively reported. These nanoplate/nanosheet photocatalysts exhibit enhanced performance for photocatalytic reduction of CO 2 into CH 4 in the presence of water vapor due to the improved separation of photo-generated electron and hole pairs .…”

Section: Nanostructured Photocatalystsmentioning

confidence: 99%

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

et al. 2014

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The shortage of fossil fuels and the disastrous pollution of the environment have led to an increasing interest in artificial photosynthesis. The photocatalytic conversion of CO 2 into solar fuel is believed to be one of the best methods to overcome both the energy crisis and environmental problems. It is of significant importance to efficiently manage the surface reactions and the photo-generated charge carriers to maximize the activity and selectivity of semiconductor photocatalysts for photoconversion of CO 2 and H 2 O to solar fuel. To date, a variety of strategies have been developed to boost their photocatalytic activity and selectivity for CO 2 photoreduction. Based on the analysis of limited factors in improving the photocatalytic efficiency and selectivity, this review attempts to summarize these strategies and their corresponding design principles, including increased visible-light excitation, promoted charge transfer and separation, enhanced adsorption and activation of CO 2 , accelerated CO 2 reduction kinetics and suppressed undesirable reaction. Furthermore, we not only provide a summary of the recent progress in the rational design and fabrication of highly active and selective photocatalysts for the photoreduction of CO 2 , but also offer some fundamental insights into designing highly efficient photocatalysts for water splitting or pollutant degradation. INTRODUCTIONThe shortage of the energy supply and the problem of disastrous environmental pollution have been recognized as two main challenges in the near future [1]. It is a better way to efficiently and inexpensively convert solar energy into chemical fuels by developing an artificial photosynthetic (APS) system because solar fuels are high density energy carriers with long-term storage capacity. The most important and challenging reactions in APS-the photocatalytic water splitting into H 2 and O 2 (water reduction and oxidation) [2][3][4] and photoreduction of CO 2 to solar fuel, such as CH 4 and CH 3 OH [5,6] have been extensively studied since the photocatalytic water splitting on TiO 2 electrodes was discovered by Honda and Fujishima in 1972 [7]. The photocatalytic reduction of CO 2 by means of solar energy has attracted growing attention in the recent years, which 1 State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 2 College of Science, South China Agricultural University, Guangzhou 510642, China 3 Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia * Corresponding author (email: jiaguoyu@yahoo.com) is also believed to be one of the best methods to overcome both global warming and energy crisis [8]. However, it is also generally thought that photocatalytic CO 2 reduction is a more complex and difficult process than H 2 production due to preferential H 2 production and low selectivity for the carbon species produced [9,10]. The progress achieved in the photoreduction of CO 2 is still far behind that in wate...

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Photoreduction of CO2 on BiOCl nanoplates with the assistance of photoinduced oxygen vacancies

Cited by 361 publications

References 42 publications

Photocatalytic Reduction of CO2 by ZnO Micro/nanomaterials with Different Morphologies and Ratios of {0001} Facets

Photocatalytic Reduction of CO2 by ZnO Micro/nanomaterials with Different Morphologies and Ratios of {0001} Facets

Efficient Degradation of Aqueous Carbamazepine by Bismuth Oxybromide-Activated Peroxide Oxidation

Design and fabrication of semiconductor photocatalyst for photocatalytic reduction of CO2 to solar fuel

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