Visible Light-Responsive AlFeO3@g-C3N4 Heterojunction for Efficient Degradation of Organic Wastewater

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2024-06-22 DOI:10.1007/s10562-024-04751-6

Zixuan Li, Rui Mu, Wei Zhang, Xue Lin, Qi Cui, Di Gu

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Abstract

A Z-type AlFeO₃@g-C₃N₄ photocatalyst was successfully prepared via sol-gel and high-temperature polymerization. The morphology, structure, and composition of the catalysts were analyzed by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The photocatalytic performance was evaluated by nitrobenzene degradation experiments and electrochemical station, comparing with single g-C₃N₄ and AlFeO₃. Optimizing AlFeO₃ precursor content in the composite yielded 1.6 and 1.8-fold higher degradation rates than single g-C₃N₄ and AlFeO₃, respectively. Furthermore, in comparison to other ratios of AlFeO₃@g-C₃N₄ composites, AF-CN-100, which exhibited the best degrading performance, had the smallest impedance, the strongest transient photocurrent response strength, and the strongest redox capacity. The heterojunction produced between AlFeO₃ and g-C₃N₄ was a Z-type heterojunction, as revealed by investigations on energy band structure and mechanism. This heterojunction substantially improved the separation efficiency of photogenerated electrons and holes and increased the photocatalytic activity of the composites.

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用于高效降解有机废水的可见光响应型 AlFeO3@g-C3N4 异质结

摘要通过溶胶-凝胶法和高温聚合法成功制备了Z型AlFeO3@g-C3N4光催化剂。采用 X 射线衍射、扫描电子显微镜和透射电子显微镜分析了催化剂的形貌、结构和组成。通过硝基苯降解实验和电化学站评估了催化剂的光催化性能，并与单一 g-C3N4 和 AlFeO3 进行了比较。通过优化复合材料中 AlFeO3 前驱体的含量，降解率分别比单一 g-C3N4 和 AlFeO3 高出 1.6 倍和 1.8 倍。此外，与其他比例的 AlFeO3@g-C3N4 复合材料相比，降解性能最好的 AF-CN-100 阻抗最小，瞬态光电流响应强度最大，氧化还原能力最强。能带结构和机理研究表明，AlFeO3 和 g-C3N4 之间产生的异质结为 Z 型异质结。这种异质结大大提高了光生电子和空穴的分离效率，提高了复合材料的光催化活性。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.