单层Ti₃C₂助催化剂BiFeO₃/CdS复合结构优化对RhB的增强压电光催化脱除

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-05-23 DOI:10.1016/j.molstruc.2025.142784

Jiahui Lin , Hongji Li , Jing Shao , Dandan Wang , Qingming Xu

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引用次数: 0

摘要

本研究通过静电自组装成功合成了BiFeO3/CdS/Ti3C2 （BCT）复合材料，提高了BiFeO3的光催化性能。复合材料表现出优异的压电光催化活性，在120分钟内达到98.0%的RhB降解（速率常数：0.0288分钟），比原始BiFeO3提高12.68倍，同时在四个循环后保持95%的降解效率-比BC-30%提高3.3倍。这种性能的增强源于三个协同机制：(1)ii型BFO/CdS异质结增强了光吸收和电荷分离效率；(2)超声诱导压电极化，在放大BFO内部场的同时抑制界面复合；(3) Ti3C2同时作为电荷转移介质和光缓蚀剂以保证稳定性。EPR和自由基捕获实验证实，该复合材料在不同条件下（pH 3-9，不同剂量/浓度）均表现出一致的高效率。这种将CdS和Ti3C2与BFO的战略性集成为设计先进的BFO基压电光催化剂提供了一种新的方法。

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Optimization of BiFeO₃/CdS composite structure with monolayer Ti₃C₂ cocatalyst for enhanced piezo-photocatalytic removing RhB

In this study, a BiFeO₃/CdS/Ti₃C₂ (BCT) composite was successfully synthesized via electrostatic self-assembly to enhance the photocatalytic performance of BiFeO₃. The composite exhibited exceptional piezo-photocatalytic activity, achieving 98.0% RhB degradation within 120 min (rate constant: 0.0288 min⁻¹), representing a 12.68-fold enhancement over pristine BiFeO₃, while maintaining 95% degradation efficiency after four cycles - a 3.3-fold improvement compared to BC-30%. This performance enhancement originates from three synergistic mechanisms: (1) Type-II BFO/CdS heterojunction for enhanced light absorption and charge separation efficiency; (2) ultrasound-induced piezoelectric polarization that simultaneously amplifies BFO's internal field and suppresses interfacial recombination; and (3) Ti₃C₂ serving as both charge-transfer mediator and photo corrosion inhibitor to ensure stability. The composite demonstrated consistent high efficiency across varied conditions (pH 3-9, different dosages/concentrations), as verified by EPR and radical trapping experiments. This strategic integration of CdS and Ti₃C₂ with BFO presents a novel approach for designing advanced BFO-based piezoelectric photocatalysts.

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.