Carbon quantum dots from tea enhance z-type BiOBr/C3N4 heterojunctions for RhB degradation: Catalytic effect, mechanisms, and intermediates

Zhong, Yuan; Zhang, Xinyu; Wang, Yamei; Zhang, Xiaotao; Wang, Ximing

doi:10.1016/j.apsusc.2023.158254

Cited by 19 publications

(3 citation statements)

References 49 publications

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“…To date, it is still a great challenge to develop suitable strategies to optimize the separation rate of carriers and maximize the photocatalytic activity of BiOBr. − It has been demonstrated that the size and shape of photocatalysts have an impact on photocatalytic performance. − For example, a 2D nanosheet structure with a large specific surface area provides more reaction sites and thus promotes photocatalytic reactions. − Among the various shapes of BiOBr, − the flower-shaped microsphere structure of BiOBr enriched with nanosheets maximizes its specific surface area while promoting the adsorption of pollutants . In addition, doping rare earth ions into BiOBr is an effective way to enhance the separation efficiency of electron–hole pairs. − However, the rapid recombination of photogenerated carriers and the high surface energy of microspheres result in severe aggregation, thus imposing limitations on photocatalytic activity. − Assembling microspheres on fibers provides a feasible way to prevent agglomeration and facilitates recycling. − …”

Section: Introductionmentioning

confidence: 99%

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

Tao,

Luo,

Shen

et al. 2024

Langmuir

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Developing efficient catalysts to degrade pollutants in water is a very important way to alleviate water pollution. However, it is crucial but challenging to broaden the functions of conventional photocatalysts and improve their environmental adaptability. In this paper, Bi(Er 3+ /Yb 3+ )OBr/polyacrylonitrile (BOB-EY/PAN) composite fibers with a swallowed-embedded structure assembled with nanopetal-rich microflowers were designed and fabricated, integrating photocatalytic and temperature-monitoring functions simultaneously. Their unique structure brings a large specific surface area, and the doping of rare earth ions improves the separation efficiency of electron−hole pairs, which enhances the photocatalytic efficiency and endows the fibers with a temperature-monitoring function at the same time. Under simulated sunlight irradiation, the nanofibers show a maximum degradation efficiency of 99.2% for tetracycline hydrochloride (TC) with a degradation constant of K as high as 0.078 min −1 . Based on the fluorescence intensity ratio (FIR), the two thermally coupled levels of Er 3+ in the nanofibers, 2 H 11/2 and 4 S 3/2 , provide real-time temperature feedback, displaying a maximum relative sensitivity as high as 0.0215 K −1 at 303 K. Dual-functional BOB-EY/PAN composite nanofibers show great potential for industrial wastewater disposition, providing solutions for wastewater purification in special scenarios.

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Section: Introductionmentioning

confidence: 99%

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

Tao,

Luo,

Shen

et al. 2024

Langmuir

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“…Heterogeneous photocatalysis based on inorganic semiconductors stands out as one of the most promising technologies for solving this issue due to its environmental friendliness, low energy consumption, and mild reaction conditions [ 3 , 4 , 5 ]. Semiconductor materials including TiO 2 , BiOBr, C 3 N 4 , CuO, ZnO, etc., have been extensively explored as photocatalysts for organic contaminant degradation [ 6 , 7 , 8 , 9 , 10 ]. It has been reported that highly porous TiO 2 nanofibers produced in high humidity exhibit a MB degradation efficiency of 90% in 30 min, benefiting by its large surface area (128 m 2 /g) [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of carbon quantum dots could improve the band structure significantly. Zhong et al prepared a carbon dot-doping C 3 N 4 /BiOBr heterostructure in order to enhance band regulation and electron transfer, resulting in 98.48% of rhodamine B (RhB) degradation within 15 min [ 7 ]. Xing et al reported that CuO synthesized via the hydrothermal method displayed significant catalytic efficiencies in activating peroxymonosulfate for ciprofloxacin degradation.…”

Section: Introductionmentioning

confidence: 99%

Zn-Doped MnCO3/CS Composite Photocatalyst for Visible-Light-Driven Decomposition of Organic Pollutants

Liang,

Zhao,

Liu

et al. 2024

Molecules

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Zn-doped MnCO3/carbon sphere (Zn-doped MnCO3/CS) composites were synthesized using a simple hydrothermal procedure. Among various samples (ZM-50, ZM-05, and ZMC-0), the ternary Zn-doped MnCO3/CS (ZMC-2) catalyst demonstrated excellent visible light-induced photocatalytic activity. This improvement comes from the Zn addition and the conductive CS, which facilitate electron movement and charge transport. The catalyst exhibited efficient degradation of methylene blue (MB) over a wide pH range, achieving a removal efficiency of 99.6% under visible light. Radical trapping experiments suggested that •OH and •O2− played essential roles in the mechanism of organic pollutant degradation. Moreover, the catalyst maintained good degradation performance after five cycles. This study offers valuable perspectives into the fabrication of carbon-based composites with promising photocatalytic activity.

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Research Progress in the Preparation and Application of BiOBr‐Based Z‐scheme Heterojunction Composite Photocatalysts

Chen,

Zhang,

et al. 2024

ChemistrySelect

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Bismuth bromide oxide (BiOBr) photocatalysts suffer from the defects of low light energy utilization, low efficiency, and easy deactivation, which limit their wide applications. BiOBr‐based Z‐scheme heterojunctions have strong redox capabilities due to their unique structure that can improve the separation efficiency of photogenerated electrons and holes. This paper describes the preparation of BiOBr‐based Z‐scheme heterojunctions and analyzes the morphology and structural features of the photocatalytic materials obtained by different preparation methods. The applications of BiOBr‐based Z‐scheme heterojunction composite photocatalysts are discussed, including photocatalytic preparation of hydrogen, degradation of pollutants in wastewater, and carbon dioxide reduction, as well as the analysis of the catalyst's mechanism of action in each degradation process and the calculation of charge transfer paths of the relevant materials by DFT. The results show that the photocatalytic activity of such photocatalyst materials can be improved by constructing BiOBr‐based Z‐scheme heterojunctions to increase the photocarrier separation efficiency and transport capacity. But the photocatalytic mechanism, such as the separation efficiency of interfacial carriers and the transport pathways, needs to be further explored.

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Carbon quantum dots from tea enhance z-type BiOBr/C3N4 heterojunctions for RhB degradation: Catalytic effect, mechanisms, and intermediates

Cited by 19 publications

References 49 publications

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

Zn-Doped MnCO3/CS Composite Photocatalyst for Visible-Light-Driven Decomposition of Organic Pollutants

Research Progress in the Preparation and Application of BiOBr‐Based Z‐scheme Heterojunction Composite Photocatalysts

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