Enhanced piezo-photocatalytic performance of ZnO/BNBT-6 heterojunction via piezoelectric effect for degradation of dye wastewater

IF 4 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2024-09-03 DOI:10.1016/j.molstruc.2024.139928

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Abstract

The combination of mechanical energy and solar energy is considered as an effective strategy to solve energy and environmental problems. Here, we prepare ZnO/(Na_0.5Bi_0.5)_0.94Ba_0.06TiO₃(ZnO/BNBT-6) heterostructure, which significantly enhances the piezo-photocatalytic degradation performance by the piezoelectric effect induced under the built-in electric field. The catalytic oxidation capacity of the ZnO/BNBT-6 heterostructure was significantly improved, and the reaction rate constant can be up to 0.07335 min^-1 under ultrasonic vibration and ultraviolet visible light irradiation, which is much higher than that of photocatalysis and piezocatalysis. This excellent performance occurs because a built-in polarization field is generated inside the BNBT-6 nanorod by ultrasound, which can accelerate effective separation of photogenerated e⁻-h⁺ pairs in BNBT-6 and ZnO, therefore, enhancing the activity of the heterojunction. Finally, a possible piezo-photocatalytic degradation mechanism was proposed based on the free radical trapping experiment and experimental results. This study provides a valuable reference for the design of high efficient piezo-photocatalysts.

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通过压电效应提高 ZnO/BNBT-6 异质结在降解染料废水中的压电光催化性能

机械能和太阳能的结合被认为是解决能源和环境问题的有效策略。在此，我们制备了 ZnO/(Na0.5Bi0.5)0.94Ba0.06TiO3(ZnO/BNBT-6)异质结构，通过内置电场诱导的压电效应显著提高了压电光催化降解性能。ZnO/BNBT-6 异质结构的催化氧化能力明显提高，在超声振动和紫外可见光照射下，反应速率常数可达 0.07335 min-1，远高于光催化和压电催化。之所以能取得如此优异的性能，是因为超声波在 BNBT-6 纳米棒内部产生了一个内置极化场，能加速 BNBT-6 和 ZnO 中光生成的 e-h+ 对的有效分离，从而提高了异质结的活性。最后，根据自由基捕获实验和实验结果，提出了一种可能的压电光催化降解机制。该研究为设计高效压电光催化剂提供了有价值的参考。

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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.

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