Novel p-n type polyimide aerogels/BiOBr heterojunction for visible light activated high efficient photocatalytic degradation of organic contaminants

Qu, Junnan; Sun, Xinyue; Yang, Chorng-Horng; Xue, Lin; Li, Zhongfu; Cui, Baolong; Hu, Yingyue; Du, Yi; Pei-hong, JI

doi:10.1016/j.jallcom.2021.163469

Cited by 22 publications

(4 citation statements)

References 55 publications

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“…Figure 6b was obtained through the Tauc plots from Kubelka−Munk function transformation. 57,58 The band gap energies of Bi 3 NbO 7 , BiOBr 0.75 I 0.25 , and 0.05BNO-BOBI are 2.67, 2.13, and 2.12 eV, respectively, as observed in Figure 6b 59 The separation efficiency of photo-charges (e − −h + ) has an influence on photocatalytic activity, which is evaluated by electrochemical experiments. The measurements of photocurrent response and EIS were measured, and the results are provided in Figure 7.…”

Section: Resultsmentioning

confidence: 94%

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Persulfate Activation of Photocatalysts Based on S-Scheme Bi₃NbO₇/BiOBr_0.75I_0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

Wang

et al. 2023

ACS Appl. Nano Mater.

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Photocatalytic activation of persulfate has been receiving much attention in the field of wastewater treatment. In this work, the Bi 3 NbO 7 /BiOBr 0.75 I 0.25 nanosheet S-scheme heterojunctions were synthesized by the solvothermal method to activate persulfate. The degradation rates of rhodamine B (RhB) and TC by 0.05Bi 3 NbO 7 / BiOBr 0.75 I 0.25 were 95.4 and 74.7% in 2 h, respectively, indicating that 0.05Bi 3 NbO 7 /BiOBr 0.75 I 0.25 nanosheet heterojunctions have good photocatalytic activity. The synergistic effect between persulfate and the 0.05Bi 3 NbO 7 /BiOBr 0.75 I 0.25 photocatalyst was investigated under different persulfate contents, pH values, and light conditions. The RhB degradation rate of 0.05Bi 3 NbO 7 /BiOBr 0.75 I 0.25 activation persulfate is more than twice that of 0.05Bi 3 NbO 7 /BiOBr 0.75 I 0.25 , and the range of pH adaptation is wide. Radical quenching experiments showed that h + , • O 2 − , and •OH were the important active groups. Persulfate and catalysts produce a synergistic effect, which is S 2 O 8 2− reacting with e − to form •SO 4 − in the photocatalytic process. Meanwhile, the formation of •SO 4 − accelerates the process of photocatalytic reaction. This work provides ideas for the design of efficient and pollution-free photocatalysts for the activation of persulfate.

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Section: Resultsmentioning

confidence: 94%

“…Generally, the flat band of n -type semiconductors is located 0.1–0.3 eV below the conduction band (0.1 eV is taken in this paper), so the E CB of Bi 3 NbO 7 and BiOBr 0.75 I 0.25 are −0.89 and 0.23 eV, respectively. Therefore, the E VB of Bi 3 NbO 7 and BiOBr 0.75 I 0.25 are 1.78 and 2.35 eV ( E VB = E CB + E g ), respectively …”

Section: Resultsmentioning

confidence: 96%

Persulfate Activation of Photocatalysts Based on S-Scheme Bi₃NbO₇/BiOBr_0.75I_0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

Wang

et al. 2023

ACS Appl. Nano Mater.

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“…32 As shown in Figure 4a−c, the adsorption−desorption isotherms of BNO, BOC, and 1.2BNO-BOC are consistent with the type III isotherms and the characteristics of lag ring H3. 33,34 Based on the pore size distribution maps of the samples in the inset plots, it was revealed that BNO, BOC, and 1.2BNO-BOC contain numerous mesopores with pore sizes mainly distributed around 30−40, 5−10, and 20−40 nm, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

S-Scheme Nanometer-Sized Bi₃NbO₇/Bi₂O₂CO₃ Heterojunction Photocatalysts for Efficient Pollutant Degradation

Cui,

Xue,

Pan

et al. 2024

ACS Appl. Nano Mater.

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Bi 3 NbO 7 (abbreviated BNO) exhibits favorable visible light responsiveness and chemical stability as a photocatalyst, which could be utilized for the purification of aqueous environments. However, the high photogenerated carrier complexation rate severely restricts the photocatalytic reaction. In this work, the one-pot solvent method was used to improve the photocatalytic ability by preparing S-scheme heterojunction composite photocatalysts by adding urea. The characteristic lamellar structure of Bi 2 O 2 CO 3 (abbreviated BOC) can increase the specific surface area and provide more active sites for the photoreaction. The construction of the S-scheme heterojunction could promote effective charge transfer and consume the unnecessary electrons and holes; meanwhile, the whole system is maintained at a high redox level so as to oxidize and decompose the pollutants. The experimental results showed that nanometer-sized 1.2 Bi 3 NbO 7 /Bi 2 O 2 CO 3 (abbreviated 1.2BNO/BOC) possesses good degradation effects for the simulated pollutants, the degradation efficiency is significantly improved compared with pure BNO, and the photocatalyst exhibits good cyclic stability. KEYWORDS: Bi 3 NbO 7 /Bi 2 O 2 CO 3 , S-scheme heterojunction, photocatalysis, built-in electric field, high redox potential

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“…This is consistent with the electron‐transfer mechanism typically observed in p–n heterojunctions. [ 48 ] To establish a p–n junction between n‐type KNN and p‐type CuO, it is evident that electron transfer from KNN to CuO is required to align the Fermi levels accordingly. A detailed discussion of this will be provided in the subsequent section.…”

Section: Resultsmentioning

confidence: 99%

Single‐Crystal Ferroelectric‐Based (K,Na)NbO₃ Microcuboid/CuO Nanodot Heterostructures with Enhanced Photo–Piezocatalytic Activity

Im,

Park,

Hwang

et al. 2023

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Developing single‐crystal‐based heterostructured ferroelectrics with high‐performance photo–piezocatalytic activity is highly desirable to utilize large piezopotentials and more reactive charges that can trigger the desired redox reactions. To that end, a single‐crystal‐based (K,Na)NbO3 (KNN) microcuboid/CuO nanodot heterostructure with enhanced photo–piezocataytic activity, prepared using a facile strategy that leveraged the synergy between heterojunction formation and an intense single‐crystal‐based piezoelectric effect, is reported herein. The catalytic rhodamine B degrading activity of KNN/CuO is investigated under light irradiation, ultrasonication, or co‐excitation with both stimulations. Compared to polycrystalline KNN powders and bare KNN single‐crystals, single‐crystal‐based KNN/CuO exhibits a higher piezocurrent density and an optimal energy band structure, resulting in 5.23 and 2.37 times higher piezocatalytic degradation activities, respectively. Furthermore, the maximum photo–piezocatalytic rate constant (≈0.093 min−1) of KNN/CuO under 25 min ultrasonication and light irradiation is superior to that of other KNN‐based catalysts, and 1.6 and 48.6 times higher than individual piezocatalytic and photocatalytic reaction rate constants, respectively. The excellent photo–piezocatalytic activity is attributed to the enhanced charge‐carrier separation and proper alignment of band structure to the required redox levels by the appropriate p–n heterojunction and high piezoelectric potential. This report provides useful insight into the relationships between heterojunctions, piezoelectric responses, and catalytic mechanisms for single‐crystal‐based heterostructured catalysts.

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Novel p-n type polyimide aerogels/BiOBr heterojunction for visible light activated high efficient photocatalytic degradation of organic contaminants

Cited by 22 publications

References 55 publications

Persulfate Activation of Photocatalysts Based on S-Scheme Bi₃NbO₇/BiOBr_0.75I_0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

Persulfate Activation of Photocatalysts Based on S-Scheme Bi₃NbO₇/BiOBr_0.75I_0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

S-Scheme Nanometer-Sized Bi₃NbO₇/Bi₂O₂CO₃ Heterojunction Photocatalysts for Efficient Pollutant Degradation

Single‐Crystal Ferroelectric‐Based (K,Na)NbO₃ Microcuboid/CuO Nanodot Heterostructures with Enhanced Photo–Piezocatalytic Activity

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Novel p-n type polyimide aerogels/BiOBr heterojunction for visible light activated high efficient photocatalytic degradation of organic contaminants

Cited by 22 publications

References 55 publications

Persulfate Activation of Photocatalysts Based on S-Scheme Bi3NbO7/BiOBr0.75I0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

Persulfate Activation of Photocatalysts Based on S-Scheme Bi3NbO7/BiOBr0.75I0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

S-Scheme Nanometer-Sized Bi3NbO7/Bi2O2CO3 Heterojunction Photocatalysts for Efficient Pollutant Degradation

Single‐Crystal Ferroelectric‐Based (K,Na)NbO3 Microcuboid/CuO Nanodot Heterostructures with Enhanced Photo–Piezocatalytic Activity

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Product

Resources

About

Persulfate Activation of Photocatalysts Based on S-Scheme Bi₃NbO₇/BiOBr_0.75I_0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

Persulfate Activation of Photocatalysts Based on S-Scheme Bi₃NbO₇/BiOBr_0.75I_0.25 Nanosheet Heterojunctions for Degradation of Organic Pollutants

S-Scheme Nanometer-Sized Bi₃NbO₇/Bi₂O₂CO₃ Heterojunction Photocatalysts for Efficient Pollutant Degradation

Single‐Crystal Ferroelectric‐Based (K,Na)NbO₃ Microcuboid/CuO Nanodot Heterostructures with Enhanced Photo–Piezocatalytic Activity