Hierarchical nanostructured 3D flowerlike BiOX particles with excellent visible-light photocatalytic activity

Song, Jun; Wang, Baoying; Guo, Xianjie; Wang, Ruifen; Dong, Zhongping

doi:10.1007/s11051-016-3556-1

Cited by 10 publications

(3 citation statements)

References 46 publications

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“…Except for being produced by single BiOCl and Bi 2 O 3 solid, h + and e – can also be produced in the BiOCl/Bi 2 O 3 heterojunction. It has been reported before that in the preparation of photocatalysts under different synthetic conditions, different particle sizes, pore structures, and microstructures can be obtained, which will affect the optical band gap energies ( E g ) of the prepared photocatalysts. − Simultaneously, the relative position of the conduction band (CB) and valence band (VB), which is closely related to the value of E g , determines the properties of the synthetic heterojunction through affecting the flow path of e – and h + . For instance, for the BiOCl/Bi 2 O 3 material prepared from Bi(NO 3 ) 3 ·5H 2 O in KCl solution, h + and e – were produced in Bi 2 O 3 and BiOCl under UV irradiation, respectively .…”

Section: Resultsmentioning

confidence: 99%

UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi₂O₃: Efficiency Enhancement and Mechanisms

Dou

Hu²,

Kong³

et al. 2019

Environ. Sci. Technol.

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Strongly acidic wastewater generated from nonferrous metal smelting industries can be recycled as sulfuric acid after the contaminants have been removed, and among which, Cl– is rather difficult to remove. Although previous studies showed that Cl– can be removed from acidic Zn electrolyte by Bi2O3, this method still suffers from low efficiency when being employed for strongly acidic wastewater recycling. Otherwise, very high Bi2O3 dosage and H2SO4 concentration are required, leading to the need for improvement. In this study, UV irradiation was employed to improve the removal, and it was found that Cl– removal efficiency was substantially enhanced from 63.9 to 98.3%, the optimum Bi2O3/Cl– mole ratio was lowered from 1.5:1 to 0.5:1, and to achieve the maximum removal efficiency, the required H2SO4 concentration was lowered from 70 to 40 g/L. The mechanisms were also elaborated. First, Bi2O3 dissolves under the function of UV and H+, and the produced Bi3+ combines with H2O and Cl– to form BiOCl. Then, Bi2O3/BiOCl transforms into BiOCl(h+)/Bi2O3(e–) under UV irradiation, and the generated h+ oxidizes Cl– to Cl•. Finally, Cl• reacts with Bi2O3/e– to produce BiOCl. This study offered a theoretical foundation for the improvement of Cl– removal from strongly acidic wastewater.

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Section: Resultsmentioning

confidence: 99%

UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi₂O₃: Efficiency Enhancement and Mechanisms

Dou

Hu²,

Kong³

et al. 2019

Environ. Sci. Technol.

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“…However, the reported BiOX materials only contained one or two halogen elements have been prepared by precipitation methods at room temperature, but the crystallisation duration is relatively longer, such as 4 h or 12 h [18, 19]. Additionally, BiOXs (X = Cl, Br and I) particle with three halogen elements was prepared by a facile solvothermal route, the visible light catalytic properties of which are better than that of BiOX (X = Cl, Br or I) obtained under the same preparation conditions in our group [26]. According to the above theories and experiments, BiOXs with three halogen elements prepared by precipitation methods (P‐BiOXs, X = Cl, Br and I) at room temperature for a short reaction time should exhibit more excellent photocatalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Facile precipitation synthesis of extraordinary visible‐light‐driven BiOXs photocatalyst

Guo

Zhu

et al. 2020

Micro & Nano Letters

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Bismuth halide oxide with three halogen elements (P-BiOXs) catalyst was prepared by a facile precipitation method at room temperature only for 30 min. Several measurement technologies were employed to characterise the structures and morphologies of the obtained samples. Coloured Rhodamine B (RhB), methyl orange (MO), methylene blue (MB) and colourless bisphenol A (BPA) were selected to evaluate the photocatalytic activity of the samples. The experimental results showed the P-BiOXs thin nanoplates exhibited the most excellent photocatalytic activity among the prepared samples for the degradation of MO under visible light illumination. More importantly, the catalyst P-BiOXs could effectively degradate RhB, MB and BPA. The P-BiOXs catalyst displayed good photocatalytic stability by the recycling tests. The highly efficient visible light catalytic properties of P-BiOXs could be due to the high specific surface area, enhanced light-harvesting ability, the suitable bandgap energy and the lower recombination rate of the photogenerated electrons and holes.

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“…This is due largely to the fact bismuth oxyhalide compounds such as BiOI (E g = 1.7 eV) possess narrow bandgaps compared to TiO 2 (E g = 3.2 eV) [12] and therefore can function under lower-energy irradiation including visible light [12,70]. Numerous other groups have also shown BiOX catalysts present high photocatalytic activity under visible light irradiation [71][72][73][74]. This is a tremendous advantage of using BiOX catalysts since water can be treated in outdoor facilities vs. storing it in tanks or channels at a wastewater treatment facility with continuously running UV lights.…”

Section: Introductionmentioning

confidence: 99%

Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

2018

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Bismuth oxyhalides have recently gained attention for their promise as photocatalysts. Due to their layered structure, these materials present fascinating and highly desirable physicochemical properties including visible light photocatalytic capability and improved charge separation. While bismuth oxyhalides have been rigorously evaluated for the photocatalytic degradation of dyes and many synthesis strategies have been employed to enhance this property, relatively little work has been done to test them against pharmaceuticals and pesticides. These persistent organic pollutants are identified as emerging concerns by the EPA and effective strategies must be developed to combat them. Here, we review recent work directed at characterizing the nature of the interactions between bismuth oxyhalides and persistent organic pollutants using techniques including LC-MS/MS for the determination of photocatalytic degradation intermediates and radical scavenging to determine active species during photocatalytic degradation. The reported investigations indicate that the high activity of bismuth oxyhalides for the breakdown of persistent organic pollutants from water can be largely attributed to the strong oxidizing power of electron holes in the valence band. Unlike conventional catalysts like TiO2, these catalysts can also function in ambient solar conditions. This suggests a much wider potential use for these materials as green catalysts for industrial photocatalytic transformation, particularly in flow chemistry applications.

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Hierarchical nanostructured 3D flowerlike BiOX particles with excellent visible-light photocatalytic activity

Cited by 10 publications

References 46 publications

UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi₂O₃: Efficiency Enhancement and Mechanisms

UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi₂O₃: Efficiency Enhancement and Mechanisms

Facile precipitation synthesis of extraordinary visible‐light‐driven BiOXs photocatalyst

Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

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Hierarchical nanostructured 3D flowerlike BiOX particles with excellent visible-light photocatalytic activity

Cited by 10 publications

References 46 publications

UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi2O3: Efficiency Enhancement and Mechanisms

UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi2O3: Efficiency Enhancement and Mechanisms

Facile precipitation synthesis of extraordinary visible‐light‐driven BiOXs photocatalyst

Application of BiOX Photocatalysts in Remediation of Persistent Organic Pollutants

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Product

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UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi₂O₃: Efficiency Enhancement and Mechanisms

UV-Improved Removal of Chloride Ions from Strongly Acidic Wastewater Using Bi₂O₃: Efficiency Enhancement and Mechanisms