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可见光光催化:用于苯酚降解的高效Z型LaFeO/g-CN/ZnO光催化剂

Visible light photocatalysis: efficient Z-scheme LaFeO/g-CN/ZnO photocatalyst for phenol degradation.

作者信息

Cui Jinggang, Xu Chang, Jin Zehua, Liu Hongwei, Hu Ruisheng, Liu Fenrong

机构信息

Key Laboratory of Coal Chemistry, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, Inner Mongolia, China.

School of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC, 29634, USA.

出版信息

Environ Sci Pollut Res Int. 2023 Sep;30(43):96875-96890. doi: 10.1007/s11356-023-29199-w. Epub 2023 Aug 15.

DOI:10.1007/s11356-023-29199-w
PMID:37581730
Abstract

In this work, a Z-scheme LaFeO/g-CN/ZnO heterojunction photocatalyst with large specific surface (68.758 m/g) and low cost (0.00035 times the cost of per gram of Au) was easily synthesized by glucose-assisted hydrothermal method. The structure, surface morphology, and optical properties of the photocatalyst were investigated. The constructed Z-scheme heterojunction catalysts can enhance the visible light absorption and carrier separation efficiency. Among these photocatalysts, the 10%-LaFeO/g-CN/ZnO composite possesses the premium performance for efficient degrading 97.43% of phenol within 120 min. Even after 5 cycles, it still sustains an excellent photocatalytic stability (92.13% phenol degradation). According to the XPS surface states and the capture of active species on LaFeO/g-CN/ZnO, the electrons would be transferred from ZnO and LaFeO to g-CN. In addition, ·OH plays an important role in photocatalytic reactions for phenol degradation. Thus, the proposed possible photocatalytic reaction mechanism of Z-scheme LaFeO/g-CN/ZnO can provide a more economical and efficient conception for phenol degradation.

摘要

在本工作中,通过葡萄糖辅助水热法轻松合成了具有大比表面积(68.758 m²/g)和低成本(每克成本仅为金的0.00035倍)的Z型LaFeO₃/g-C₃N₄/ZnO异质结光催化剂。对该光催化剂的结构、表面形貌和光学性质进行了研究。构建的Z型异质结催化剂能够提高可见光吸收和载流子分离效率。在这些光催化剂中,10%-LaFeO₃/g-C₃N₄/ZnO复合材料具有优异性能,可在120分钟内高效降解97.43%的苯酚。即使经过5次循环,它仍保持出色的光催化稳定性(苯酚降解率为92.13%)。根据XPS表面态以及LaFeO₃/g-C₃N₄/ZnO上活性物种的捕获情况,电子将从ZnO和LaFeO₃转移至g-C₃N₄。此外,·OH在苯酚降解的光催化反应中起重要作用。因此,所提出的Z型LaFeO₃/g-C₃N₄/ZnO可能的光催化反应机理可为苯酚降解提供一种更经济高效的思路。

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