Synthesis of Bi2WO6 with gradient oxygen vacancies for highly photocatalytic NO oxidation and mechanism study

Huo, Wangchen; Dong, Xing’an; Li, Jie Yuan; Li, Meng; Liu, Xiao Ying; Zhang, Jintao

doi:10.1016/j.cej.2018.12.071

Cited by 276 publications

(74 citation statements)

References 51 publications

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“…In the absence of photocatalysts, NO is very stable and cannot be photolysed under visible light irradiation [6]. Semiconductor photocatalysis as an alternative to conventional approaches mediated advanced oxidation technology for degradation of environmental pollutants [7][8][9][10] is attracting the most attention, especially considering the characteristics of in-situ generating reactive radicals species (e.g. • OH) as strong oxidants, and the operating cost for the process can be reduced dramatically when solar energy is used [11,12].…”

Section: Introductionmentioning

confidence: 99%

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Abdellatif

Zhang

Wang

et al. 2019

Chemical Engineering Journal

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Graphitic carbon nitride has been considered as a promising metal-free visible light photocatalyst for air pollutants oxidation due to its suitable band-gap energy and higher conduction band edge. Herein, we have developed a facile approach for dramatically downwards shifting band edge positions of carbon nitride up by about 1 eV via in-plane heterojunction with graphitic carbon units to enhance the oxidation capability of the electron holes generated from the valence band. The graphitic carbon units in junction with tri-s-triazine domains were clearly observed and its in-plane hybridization with carbon nitride was formed during the copolymerization using melamine with a small amount of m-phenylenediamine as the precursors. The direct intralayer junction between the tri-s-triazine and the graphitic carbon domain, essentially different with interlayer junction reported in literature, is able to shift downwards the band edge positions via merging electron density of states of carbon nitride with that of graphitic carbon, and thus would be beneficial for separation of photoexcited charge carriers and generation of hydroxyl radicals for the oxidation of pollutants. The hybrid photocatalyst prepared with a small quantity (less than 1%) of m-phenylenediamine and melamine as precursors has shown much enhanced NO oxidation to final products(NO 2 and NO 3-) and increased NO removal 10% than the one from melamine only.

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Section: Introductionmentioning

confidence: 99%

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Abdellatif

Zhang

Wang

et al. 2019

Chemical Engineering Journal

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“…The peaks at 1341, 1377, 1398, 1495, 1507, 1587 and 1715 cm −1 are consistent with nitrites (NO 2 − ) . The strong peaks at 1237, 1277, 1520, 1652 and 1687 cm −1 can be ascribed to bridging nitrates (br‐NO 3 − ), monodentate nitrates (mo‐NO 3 − ) and bidentate nitrates (bi‐NO 3 − ) (Table ) . The intensity of these bands is gradually increased in the spectra, confirming that NO is oxidized to form other nitrogen species by the active groups under light illumination.…”

Section: Resultsmentioning

confidence: 61%

Constructing 1D/2D BiOI/ZnWO₄p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO

Gong

Zhu

Bello

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Photocatalysis technology based on green renewable solar energy has broad prospects in environmental protection and new energy utilization. The energy of the light can be utilized to convert the pollutants in the environment into non-toxic substances even available products. Due to its low cost and environmental protection, photocatalysis technology has been further developed in the fields of water splitting, sewage treatment and nitrogen oxides (NO x ) removal.RESULTS: In this study, zinc tungstate (ZnWO 4 ) nanorods loaded on bismuth oxyiodide (BiOI) nanosheets with exposed {001} facet forming a 1D/2D BiOI/ZnWO 4 p-n heterojunction photocatalysts were synthesized and their photocatalytic activities for nitric oxide (NO) removal were investigated. The 20% BOI/ZWO composite exhibited the most excellent photocatalytic NO removal performance, which were 32.32% and 48.24% under visible light and simulated sunlight irradiation, respectively. CONCLUSION: A novel 1D/2D BiOI/ZnWO 4 p-n heterojunction was successfully synthesized by a two-step procedure. Compared to the pure ZnWO 4 and BiOI, the 20% BOI/ZWO composite has a significant increase in photocatalytic activity which is attributed to the enhanced visible light absorption and the improved separation of charge carriers. Trapping experiments and electron spin resonance results indicate that the hole (h + ), super oxygen radical (·O 2 − ) and hydroxyl radical (·OH) play minor roles, while the electron (e − ) has a major contribution to the NO removal process. Therefore, the BiOI/ZnWO 4 p-n heterojunction is a promising material for NO removal.

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“…Under visible light illumination, photocatalysts are used to degrade organic pollutants, generate hydrogen through water decomposition, and convert CO 2 into renewable hydrocarbon fuels, all of which can help address global warming, environmental pollution and energy crises in human society . The potential use of bismuth‐based compounds as novel photocatalysts has gained considerable interest . Bi 2 MoO 6 , a perovskite layered composite oxide with Aurivillius‐phase, has attracted attention due to its narrow band gap which causes good visible light response .…”

Section: Introductionmentioning

confidence: 99%

MoS₂ as Cocatalyst for Improving Photocatalytic Performance of Bi₂MoO₆

Hong

Xue

et al. 2019

ChemistrySelect

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Bi2MoO6 is a bismuth‐based multi‐element photocatalyst with good visible light response due to its narrow band gap. However, its high photogenerated electron‐hole recombination rate limits its application as a photocatalyst. In this work, visible‐light‐driven MoS2/Bi2MoO6 composite photocatalyst was successfully synthesized by a hydrothermal method. The composite containing 1% MoS2 exhibited the best photodegradability and good cycling stability. The apparent reaction rate constant for the 1% MoS2 decorated Bi2MoO6 (0.03625) was about 2 times higher than that of pure Bi2MoO6 (0.01913). As a non‐precious metal promoter, MoS2 promoted the carrier‐separation efficiency and improved the absorption of visible light, which resulted in the enhancement of photocatalytic activity of the composite catalyst.

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Synthesis of Bi2WO6 with gradient oxygen vacancies for highly photocatalytic NO oxidation and mechanism study

Cited by 276 publications

References 51 publications

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Constructing 1D/2D BiOI/ZnWO₄p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO

MoS₂ as Cocatalyst for Improving Photocatalytic Performance of Bi₂MoO₆

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Synthesis of Bi2WO6 with gradient oxygen vacancies for highly photocatalytic NO oxidation and mechanism study

Cited by 276 publications

References 51 publications

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Boosting photocatalytic oxidation on graphitic carbon nitride for efficient photocatalysis by heterojunction with graphitic carbon units

Constructing 1D/2D BiOI/ZnWO4p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO

MoS2 as Cocatalyst for Improving Photocatalytic Performance of Bi2MoO6

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Constructing 1D/2D BiOI/ZnWO₄p‐n heterojunction photocatalyst with enhanced photocatalytic removal of NO

MoS₂ as Cocatalyst for Improving Photocatalytic Performance of Bi₂MoO₆