制备 ZnIn2S4/CeO2 S 型异质共轭物，用于在可见光照射下增强四环素的去除效果

IF 3.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Communications Pub Date : 2024-08-31 DOI:10.1016/j.mtcomm.2024.110280

Zhanying Ma, Yang Liu, Wenhui Chen, Jiarui Yang, Lingjuan Deng, Caihua Zhou, Guang Fan, Yuxing Yang, Yangqing He

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引用次数: 0

摘要

通过沉淀法和水热法设计并制备了一系列 S 型 ZnInS/-CeO 异质结。采用 XRD、SEM、TEM、EDX、XPS、UV-vis DRS 和吸附-光催化技术研究了其晶相结构、形貌、尺寸、元素组成、光响应特性和对四环素的消除能力。XRD 分析表明，ZnInS/-CeO 样品中的 CeO 和 ZnInS 分别呈现立方和六方相结构。SEM 和 TEM 图像表明，在 4 μm 的 ZnInS 微颗粒的光滑表面上附着有约 20 nm 的不规则形状的 CeO 颗粒。与纯 CeO 相比，所有合成的 ZnInS/-CeO 样品都能吸收更多的可见光，且吸收边缘都发生了红移。ZnInS/0.3-CeO 样品的光催化性能显著提高，在 100 分钟内对四环素的去除率达到 87.29%。详细的实验和 DFT 计算表明，光催化性能的增强主要归因于宽的光响应范围、合适的能带位置和 S 型异质结构的成功制备所产生的协同效应，这有利于光生成的 e/h 对的快速转移和分离。清除剂实验和 ESR 数据显示，ZnInS/0.3-CeO 体系在去除四环素时，-O 和 h 活性物种起主导作用。此外，新合成的 ZnInS/0.3-CeO 样品具有良好的稳定性，在重复使用 4 次后，去除率仍能达到 70.73%。此外，还提出了 ZnInS/-CeO 可能增强的光催化机理，以便更好地理解光催化过程。这项工作为制备基于 CeO 的异质结提供了指导，有望有效消除废水中的抗生素残留。

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Fabrication of ZnIn2S4/CeO2 S-scheme heterojuntion for the enhanced removal of tetracycline under visible light irradiation

A series of S-scheme ZnInS/-CeO heterojunction were designed and fabricated through precipitation and hydrothermal method. XRD, SEM, TEM, EDX, XPS, UV–vis DRS and adsorption-photocatalytic techniques were employed to investigate its crystal phase structure, morphology, size, elemental composition, photo-response property and elimination ability for tetracycline. XRD analysis revealed CeO and ZnInS in ZnInS/-CeO sample presented cubic and hexagonal phase structure, respectively. SEM and TEM images indicated that CeO particles with irregular-shaped of around 20 nm were attached on the smooth surface of ZnInS microparticles with 4 μm. All the as-synthesized ZnInS/-CeO samples could harvest more visible-light and the absorption edges were red-shifted in comparison with pure CeO. ZnInS/0.3-CeO sample exhibited remarkably enhanced photocatalytic performance and its removal efficiency for tetracycline reached 87.29 % within 100 min. The detailed experimental and DFT calculation indicated that the enhanced photocatalytic property was mainly ascribed to the synergistic effect of wide light-response range, suitable band position and successful fabrication of S-scheme heterostructure, which was in favor of rapid transfer and available separation of photo-generated e/h pairs. The scavenger experiments and the ESR data revealed that the •O and h active species played the dominant role in tetracycline removal over ZnInS/0.3-CeO system. In addition, the as-synthesized ZnInS/0.3-CeO samples had excellent stability and the removal efficiency still reached 70.73 % after being repeatedly used for 4 times. Furthermore, the possible enhanced photocatalytic mechanism over ZnInS/-CeO was proposed to get a better understanding of photocatalytic process. This work provided the guidance to fabricate CeO-based heterojunction with promising prospect for the efficient elimination of antibiotic residues from wastewater.

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来源期刊

Materials Today Communications Materials Science-General Materials Science

CiteScore

5.20

自引率

5.30%

发文量

1783

审稿时长

51 days

期刊介绍： Materials Today Communications is a primary research journal covering all areas of materials science. The journal offers the materials community an innovative, efficient and flexible route for the publication of original research which has not found the right home on first submission.