Competitive coordination initiated one-pot synthesis of core–shell Bi-MOF@BiOX (X = I, Br and Cl) heterostructures for photocatalytic elimination of mixed pollutants

Dai, Dingliang; Qiu, Jianhao; Xia, Guanglu; Tang, Yonghong; Wu, Zhonghao; Yao, Jianfeng

doi:10.1016/j.seppur.2023.123819

Cited by 21 publications

(10 citation statements)

References 25 publications

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“…According to Figure S1a, the XRD diffraction peaks of the precursor CAU-17 were in agreement with those previously reported. 44 As depicted in Figure S1b, it is evident that the peaks at 400−800 cm −1 correspond to the stretching vibration of O−Bi−O, 45 the peaks at 1380−1600 cm −1 show the characteristic band of the carboxylic acid group in CAU-17, 46 and the peaks at 3230−3550 cm −1 belong to the vibration of O−H in chemisorbed water. 47 Thus, the results of XRD and FT-IR both demonstrated that the precursor CAU-17 has been successfully synthesized.…”

Section: Resultsmentioning

confidence: 98%

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

Cheng,

Xiao,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Photocatalysis is extensively implemented in organic pollutant degradation, and the critical point is to develop outstanding and stable photocatalysts. Herein, the synthesis of coral reef-like α-Bi 2 O 3 /BiOBr heterostructure photocatalysts involves the in situ growth of BiOBr nanosheets onto α-Bi 2 O 3 , with the latter derived through calcination utilizing a bismuthbased metal−organic framework (CAU-17) as the precursor. Under simulated sunlight, the 20% α-Bi 2 O 3 /BiOBr heterojunction degraded nearly 97.7% of RhB in 60 min, while pure α-Bi 2 O 3 and BiOBr nanosheets degraded only 7.8 and 65.3%, respectively. Furthermore, the 20% α-Bi 2 O 3 /BiOBr nanocomposite exhibited superior recycling stability, degrading 86.6% RhB after four cyclic experiments. This is attributed to the fact that the nanoscale α-Bi 2 O 3 material obtained by calcination can retain the exoteric diffusion channels of CAU-17, making α-Bi 2 O 3 /BiOBr heterojunctions have an enormous specific surface area, providing more adsorption sites and promoting their photocatalytic capacity. Free radical capture tests and electron paramagnetic resonance measurements indicated that h + and • O 2 − were the primary active substances during photodegradation. On the basis of that, a feasible photodegradation mechanism of type II α-Bi 2 O 3 /BiOBr heterojunctions was proposed. This study opens up the possibility of designing type II heterojunctions with MOFs as precursors for dye degradation.

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Section: Resultsmentioning

confidence: 98%

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

Cheng,

Xiao,

Wang

et al. 2024

ACS Appl. Nano Mater.

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“…15–17 Nonetheless, photocatalytic performances of pristine MOFs are usually poor owing to the rapid recombination of photo-induced charge carriers. 18–20 To address the above problem, defect engineering on MOFs has recently emerged as a viable countermeasure by modulating the electronic energy band structure. 21 Investigations of defective MOFs mainly focus on Zr-MOFs ( e.g.…”

Section: Introductionmentioning

confidence: 99%

Defect-engineered Zr-MOFs with enhanced O₂ adsorption and activation for photocatalytic H₂O₂ synthesis

Tang,

Qiu,

Dai

et al. 2024

Catal. Sci. Technol.

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“…In addition, when MOFs are used as precursors, the competitive synergistic effect generated by organic ligands and other coordination elements will lead to heterogeneous stresses at different composite interfaces, which ultimately leads to disorder of the surface lattice with an increase of vacancy sites. This results in enhanced charge-carrier dissociation and transfer, in addition to increased photogenerated electron production during photoexcitation …”

Section: Introductionmentioning

confidence: 99%

“…This results in enhanced charge-carrier dissociation and transfer, in addition to increased photogenerated electron production during photoexcitation. 28 In this work, one-dimensional columnar Bi 4 O 5 Br 2 nanorods (MBO-50) were synthesized by double-solvent-induced derivatization of Bi-MOF (CAU-17). During the synthesis process, Bi 3+ was progressively released from the surface of rodlike CAU-17 to form layer growth, while more vacancy sites were created on the MBO-50.…”

Section: Introductionmentioning

confidence: 99%

Double-Solvent-Induced Derivatization of Bi-MOF to Vacancy-Rich Bi₄O₅Br₂: Toward Efficient Photocatalytic Degradation of Ciprofloxacin in Water and HCHO Gas

Li,

Han,

Wang

et al. 2024

ACS Appl. Mater. Interfaces

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MOF-derived photocatalytic materials have potential in degrading ciprofloxacin (CIP) in water and HCHO gas pollutants. Novel derivatization means and defect regulation are effective techniques for improving the performance of MOFderived photocatalysis. Vacancy-rich Bi 4 O 5 Br 2 (MBO-x) were derived in one step from Bi-MOF (CAU-17) by a modified double-solvent method. MBO-50 produced more oxygen vacancies due to the combined effect of the CAU-17 precursor and double solvents. The photocatalytic performance of MBO was evaluated by degrading CIP and HCHO. Thanks to the favorable morphology and vacancy structure, MBO-50 demonstrated the best photocatalytic efficiency, with 97.0% removal of CIP (20 mg L −1 ) and 90.1% removal of HCHO (6.5 ppm) at 60 min of light irradiation. The EIS Nyquist measurement, transient photocurrent response, photoluminescence spectra, and the calculation of energy band information indicated that the vacancy sites can effectively capture photoexcited electrons during the charge transfer process, thus limiting the recombination of electrons and holes, improving the energy band structure, and making it easier to produce superoxide anion radical (•O 2 − ) and to degrade CIP and HCHO. The improvement of photocatalytic performance of MBO-50 in HCHO degradation due to the bromine vacancy generation and filling mechanism was discussed in detail. This work provides a promising new idea for the modulation of MOF-derived photocatalytic materials.

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Competitive coordination initiated one-pot synthesis of core–shell Bi-MOF@BiOX (X = I, Br and Cl) heterostructures for photocatalytic elimination of mixed pollutants

Cited by 21 publications

References 25 publications

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

Defect-engineered Zr-MOFs with enhanced O₂ adsorption and activation for photocatalytic H₂O₂ synthesis

Double-Solvent-Induced Derivatization of Bi-MOF to Vacancy-Rich Bi₄O₅Br₂: Toward Efficient Photocatalytic Degradation of Ciprofloxacin in Water and HCHO Gas

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Competitive coordination initiated one-pot synthesis of core–shell Bi-MOF@BiOX (X = I, Br and Cl) heterostructures for photocatalytic elimination of mixed pollutants

Cited by 21 publications

References 25 publications

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi2O3 for Photodegradation of Rhodamine B

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi2O3 for Photodegradation of Rhodamine B

Defect-engineered Zr-MOFs with enhanced O2 adsorption and activation for photocatalytic H2O2 synthesis

Double-Solvent-Induced Derivatization of Bi-MOF to Vacancy-Rich Bi4O5Br2: Toward Efficient Photocatalytic Degradation of Ciprofloxacin in Water and HCHO Gas

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Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

Heterojunctions Based on BiOBr Nanosheets Decorated on α-Bi₂O₃ for Photodegradation of Rhodamine B

Defect-engineered Zr-MOFs with enhanced O₂ adsorption and activation for photocatalytic H₂O₂ synthesis

Double-Solvent-Induced Derivatization of Bi-MOF to Vacancy-Rich Bi₄O₅Br₂: Toward Efficient Photocatalytic Degradation of Ciprofloxacin in Water and HCHO Gas