A direct Z-scheme BiOBr/TzDa COF heterojunction photocatalyst with enhanced performance on visible-light driven removal of organic dye and Cr(VI)

Zhang, Yan; Chen, Zhuo; Shi, Zhixiong; Lü, Tingting; Chen, Dongli; Wang, Qiang; Zhan, Zhilan

doi:10.1016/j.seppur.2021.119216

Cited by 70 publications

(21 citation statements)

References 55 publications

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“…Heavy metal and organic pollutions pose a major threat to the environmental issues and human health [1][2][3]. Among them, hexavalent chromium (Cr(VI)) and microcystin-LR (MC-LR) are the most popular, mainly originating from industrial load and algal blooms respectively [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

TiO2@MOF Photocatalyst for the Synergetic Oxidation of Microcystin-LR and Reduction of Cr(VI) in Aqueous Media

Wang

Geng

et al. 2021

Catalysts

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The coexistence of pollutants presents a great challenge to the implementation of photocatalysts. In this work, a novel MIL-101(Fe)/TiO2 composite prepared by in situ growth of MIL-101(Fe) on TiO2 was developed for the synergetic oxidation of MC-LR and Cr(VI) reduction. The heterojunction material shows elevated photocatalytic behavior under ultraviolet compared with the unary pollutant system. Furthermore, quenching experiments and electron spin resonance confirm that the enhanced photodegradation behavior is related to the synergistic effect between the photocatalytic reduction and oxidation process, in which MC-LR consumes the holes and Cr(VI) captures electrons, followed by efficient charge separation through the conventional double-transfer mechanism between MIL-101(Fe) and TiO2. This investigation provides a deeper understanding of the construction of MOFs/semiconductor heterojunctions for the pollutants removal in multi-component contaminants system.

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Section: Introductionmentioning

confidence: 99%

TiO2@MOF Photocatalyst for the Synergetic Oxidation of Microcystin-LR and Reduction of Cr(VI) in Aqueous Media

Wang

Geng

et al. 2021

Catalysts

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“…[12] The peak at 1581 cm −1 corresponded to the stretching mode of imine bonds (CN) and the other two intense absorptions at 1508 cm −1 and 1362 cm −1 originated from the stretching of aromatic -CN-groups in the triazine units. [13] Notably, similar absorption peaks were recognized in the FTIR spectra of the Bi-decorated composites with COF-TaTp, manifesting that the modification of Bi had few influences on the chemical structure of COF-TaTp.…”

Section: Photocatalysts Synthesis and Characterizationmentioning

confidence: 56%

“…[11,12] It's worth noting that the two-dimensional (2D) crystalline COFs can supply efficient routes for the transfer of photogenerated electrons via periodic π-conjugated aromatic structure. [13] These properties of COFs endow them with the possibility of NRR and many attempts have been made. [14][15][16] However, the photocatalytic performance of COFs is confined by the high recombination of photoinduced electron-hole pairs and shortage of adequate active sites.…”

Section: Introductionmentioning

confidence: 99%

Interspersed Bi Promoting Hot Electron Transfer of Covalent Organic Frameworks Boosts Nitrogen Reduction to ammonia

Chen

Gao

et al. 2022

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a large amount of pollution. [2] Therefore, the increasingly acute issues of the energy dilemma and environmental pollution have spurred intensive researches to develop environmental-friendly and renewable ways to produce NH 3 . In this context, photocatalytic nitrogen (N 2 ) fixation has been viewed as a suitable alternative for the traditional Haber-Bosch process.The unique properties of N 2 , including the extreme dissociation energy of N≡N (941 kJ mol −1 ), the high ionization potential, and the passive amount of electron affinity, resulting in the fact that the process of N 2 fixation to NH 3 rarely happens under moderate conditions. [3] Nevertheless, the triple bonds of N 2 still have an opportunity to be weakened and activated when electrons in the catalysts occupied the antibonding orbitals of nitrogen atoms or the depletion of N 2 occupied p-orbital electrons through σ-bond coordination. [4] Therefore, effective adsorption of N 2 and sufficient photogenerated electrons are exactly crucial to enhance the performance of NH 3 production. To date, various conventional photocatalysts (TiO 2 , KNbO 3 , or In 2 O 3 , for instance) have been thoroughly investigated for photocatalytic N 2 reduction reaction (NRR). [5][6][7] Most of them, however, are subjected to inferior efficiency because photogenerated electrons tend to recombine with holes, lack of competent active sites for adsorbing and activating N 2 , and low solar energy utilization rate. Especially, many of them have unsatisfactory activity toward NRR owing to their poor ability for water oxidation (2H 2 O + 4h + → O 2 + 4H + ) and need the presence of hole scavengers (ethanol or methanol) that could greatly hasten the evolution of NH 3 . [8] In addition, it's well known that the NRR process in liquid phase comprises multiphase-reactions and complicated transfer mechanisms, involving 6e − /6H + . By comparison, the HER process is much faster considering that only two electrons and two protons are involved, [9] finally contributing to the fact that plentiful active sites and photogenerated electrons are expended by the HER and then poor selectivity is exhibited. [10] From the above point of view, it is of grand significance to exploit efficient and stable photocatalysts for NRR.Covalent organic frameworks (COFs), a class of appearing crystalline photocatalysts with periodic framework structure, have attracted researchers' attention. The favorable Seeking highly-efficient, non-pollutant, and chemically robust photocatalysts for visible-light-driven ammonia production still remained challenging, especially in pure water. The key bottle-necks closely correlate to the nitrogen activation, water oxidization, and hydrogen evolution reaction (HER) processes. In this study, a novel Bi decorated imine-linked COF-TaTp (Bi/COF-TaTp) through N-Bi-O coordination is reasonably designed to achieve a boosting solar-to-ammonia conversion of 61 µmol −1 g −1 h −1 in the sacrificial-free system. On basis of serial characterizations and DFT calculations, the incorporated Bi ...

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“…Based on the same strategy, BiOBr and TzDa COF were assembled to form a Z-scheme heterojunction BiOBr/TzDa, which can degrade rhodamine B by a variety of active substances including photogenerated holes, ˙O 2 − and ˙OH. 625 In addition, the photogenerated electrons participated in the reduction of Cr( vi ) to treat wastewater. Furthermore, Z-scheme heterojunctions based on Ag( i ) semiconductors, including AgI/COF-PD 626 and Ag 3 PO 4 /TpPa-1, 377 have also been reported.…”

Section: Application Of Metalated Cofsmentioning

confidence: 99%

Metalated covalent organic frameworks: from synthetic strategies to diverse applications

2022

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A direct Z-scheme BiOBr/TzDa COF heterojunction photocatalyst with enhanced performance on visible-light driven removal of organic dye and Cr(VI)

Cited by 70 publications

References 55 publications

TiO2@MOF Photocatalyst for the Synergetic Oxidation of Microcystin-LR and Reduction of Cr(VI) in Aqueous Media

TiO2@MOF Photocatalyst for the Synergetic Oxidation of Microcystin-LR and Reduction of Cr(VI) in Aqueous Media

Interspersed Bi Promoting Hot Electron Transfer of Covalent Organic Frameworks Boosts Nitrogen Reduction to ammonia

Metalated covalent organic frameworks: from synthetic strategies to diverse applications

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