Scheme-II heterojunction of Bi2WO6@Br-COFs hybrid materials for CO2 photocatalytic reduction

Wang, You; Dai, Zhongke; Wang, Jiajia; Zhang, Du; Zhou, Fa; Li, Jiawei; Huang, Jianhan

doi:10.1016/j.cej.2023.144559

Cited by 31 publications

(5 citation statements)

References 41 publications

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“…Very recently, Bi-based photocatalysts (e.g., Bi 2 WO 6 , Bi 2 CrO 6 , Bi 2 MoO 6 , BiOBr, BiOCl, BiOI, Bi 2 O 2 CO 3 , and BiVO 4 ), as a kind of visible-light-driven catalyst, have exhibited considerable potential in photocatalysis on account of their special characteristics and unique band structures. − Among these photocatalysts, bismuth molybdate (Bi 2 MoO 6 ) is considered to be a promising visible-light-driven catalyst because of its wide light-harvesting ranges ( E g = 2.49 eV), high photo-oxidation potential, environmental friendliness, low cost, and excellent chemical stability. , Moreover, Bi 2 MoO 6 is one of the simple Aurivillius phase compounds, which consists of (Bi 2 O 2 ) 2+ layers and MoO 4 2– layers . More significantly, Bi 2 MoO 6 possesses band positions with TS-1 to construct a Z-scheme heterojunction for upgrading the photodegradation property by accelerating photogenerated carrier separation and increasing light absorption.…”

Section: Introductionmentioning

confidence: 99%

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Ma,

Yan,

Mao

et al. 2024

Langmuir

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Titanium silicon molecular sieve (TS-1) is an oxidation catalyst that possesses a long lifetime of charge transfer excited state, high Ti utilization efficiency, large specific surface area, and good adsorption property; therefore, TS-1 acts as a Tibased photocatalyst candidate. In this work, TS-1 coupled Bi 2 MoO 6 (TS-1/BMO) photocatalysts were fabricated via a facile hydrothermal route. Interestingly, the optimized TS-1/BMO-1.0 catalyst exhibited a decent photodegradation property toward tetracycline hydrochloride (85.49% in 120 min) under the irradiation of full spectrum light, which were 4.38 and 1.76 times compared to TS-1 and BMO, respectively. The enhanced photodegradation property of the TS-1/BMO-1.0 catalyst could be attributed to the reinforced light-harvesting capacity of the photocatalyst, high charge mobility, and suitable band structure for tetracycline hydrochloride degradation. In addition, the mechanism of photocatalytic degradation of tetracycline hydrochloride by the TS-1/BMO-1.0 catalyst was reasonably proposed based on the band structure, trapping, and ESR tests. This research provided feasible ideas for the design and construction of highefficiency photocatalysts for contaminant degradation.

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Section: Introductionmentioning

confidence: 99%

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Ma,

Yan,

Mao

et al. 2024

Langmuir

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“…However, developing a floating catalytic system that uses air instead of oxygen remains a challenge for ISFR. − Due to the similarity with O 2 and the imprinting effect, oxygen defects may selectively absorb O 2 . , However, the existence of a single-phase oxygen defect may limit the activation of O–O bonds as well as the separation efficiency of the photocarriers . Although introducing other photocatalysts to form heterojunctions can facilitate the separation of photocarriers, the introduced catalysts will cover the oxygen defects, thus hindering the adsorption of oxygen. − As a consequence, to maintain a continuous ISFR, it is important to accelerate the activation of the O–O bonds for the in situ generation of H 2 O 2 and ROSs while exposing the oxygen defects for the adsorption of oxygen.…”

Section: Introductionmentioning

confidence: 99%

Aeration-Free In Situ Fenton-like Reaction: Specific Adsorption and Activation of Oxygen on Heterophase Oxygen Vacancies

Zhang,

Wang,

Wang

et al. 2024

Environ. Sci. Technol.

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Aeration accounts for 35–51% of the overall energy consumption in wastewater treatment processes and results in an annual energy consumption of 5–7.5 billion kWh. Herein, a solar-powered continuous-flow device was designed for aeration-free in situ Fenton-like reactions to treat wastewater. This system is based on the combination of TiO2–x /W18O49 featuring heterophase oxygen vacancy interactions with floating reduced graphene/polyurethane foam, which produces hydrogen peroxide in situ at the rates of up to 4.2 ppm h–1 with degradation rates of more than 90% for various antibiotics. The heterophase oxygen vacancies play an important role in the stretching of the O–O bond by regulating the d-band center of TiO2–x /W18O49, promoting the hydrogenation of *·O2 – or *OOH by H+ enrichment, and accelerating the production of reactive oxygen species by spontaneous adsorption of hydrogen peroxide. Furthermore, the degradation mechanisms of antibiotics and the treatment of actual wastewater were thoroughly investigated. In short, the study provides a meaningful reference for potentially undertaking the “aeration-free” in situ Fenton reaction, which can help reduce or even completely eradicate the aeration costs and energy requirements during the treatment of wastewater.

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“…Constructing a heterojunction structure is an effective strategy for promoting the transfer and separation of photogenerated charge carriers, thus mitigating the fast recombination of photogenerated electrons and holes. , Wang et al constructed a type II Bi 2 WO 6 @Br-COFs heterojunction interface, providing a stable platform for the rapid separation and transfer of photogenerated electrons for improved photocatalytic CO 2 reduction activity . Collado et al prepared a heterojunction interface composed of TiO 2 nanoparticles and Bi 2 WO 6 nanoflowers by hydrothermal and calcination methods.…”

Section: Introductionmentioning

confidence: 99%

“…16,17 Wang et al constructed a type II Bi 2 WO 6 @Br-COFs heterojunction interface, providing a stable platform for the rapid separation and transfer of photogenerated electrons for improved photocatalytic CO 2 reduction activity. 17 Collado et al prepared a heterojunction interface composed of TiO 2 nanoparticles and Bi 2 WO 6 nanoflowers by hydrothermal and calcination methods. The change in the electron transfer path at the interface was shown to be beneficial for the separation and transport of photogenerated charge carriers.…”

Section: ■ Introductionmentioning

confidence: 99%

Hierarchical Hollow TiO₂@Bi₂WO₆ with Light-Driven Excited Bi^(3–x)+ Sites for Efficient Photothermal Catalytic CO₂ Reduction

Liu,

Yu,

Liu

et al. 2024

Inorg. Chem.

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Converting CO 2 into valuable chemicals via sustainable energy sources is indispensable for human development. Photothermal catalysis combines the high selectivity of photocatalysis and the high yield of thermal catalysis, which is promising for CO 2 reduction. However, the present photothermal catalysts suffer from low activity due to their poor light absorption ability and fast recombination of photogenerated electrons and holes. Here, a TiO 2 @Bi 2 WO 6 heterojunction photocatalyst featuring a hierarchical hollow structure was prepared by an in situ growth method. The visible light absorption and photothermal effect of the TiO 2 @Bi 2 WO 6 photocatalyst is promoted by a hierarchical hollow structure, while the recombination phenomenon is significantly mitigated due to the construction of the heterojunction interface and the existence of excited Bi (3−x)+ sites. Such a catalyst exhibits excellent photothermal performance with a CO yield of 43.7 μmol h −1 g −1 , which is 15 and 4.7 times higher than that of pure Bi 2 WO 6 and that of physically mixed TiO 2 /Bi 2 WO 6 , respectively. An in situ study shows that the pathway for the transformation of CO 2 into CO over our TiO 2 @Bi 2 WO 6 proceeds via two important intermediates, including COO − and COOH − . Our work provides a new idea of excited states for the design and synthesis of highly efficient photothermal catalysts for CO 2 conversion.

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Scheme-II heterojunction of Bi2WO6@Br-COFs hybrid materials for CO2 photocatalytic reduction

Cited by 31 publications

References 41 publications

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Aeration-Free In Situ Fenton-like Reaction: Specific Adsorption and Activation of Oxygen on Heterophase Oxygen Vacancies

Hierarchical Hollow TiO₂@Bi₂WO₆ with Light-Driven Excited Bi^(3–x)+ Sites for Efficient Photothermal Catalytic CO₂ Reduction

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Scheme-II heterojunction of Bi2WO6@Br-COFs hybrid materials for CO2 photocatalytic reduction

Cited by 31 publications

References 41 publications

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Constructing a Titanium Silicon Molecular Sieve-Based Z-Scheme Heterojunction with Enhanced Photocatalytic Activity

Aeration-Free In Situ Fenton-like Reaction: Specific Adsorption and Activation of Oxygen on Heterophase Oxygen Vacancies

Hierarchical Hollow TiO2@Bi2WO6 with Light-Driven Excited Bi(3–x)+ Sites for Efficient Photothermal Catalytic CO2 Reduction

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Hierarchical Hollow TiO₂@Bi₂WO₆ with Light-Driven Excited Bi^(3–x)+ Sites for Efficient Photothermal Catalytic CO₂ Reduction