增强光催化还原Cr6+制备Z-Scheme MIL-125/Ag/BiOBr异质结

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2025-01-22 DOI:10.1021/acs.langmuir.4c04301

Guang Lu, Lunqiu Zhang, Jiling Liang, Wei Li, Zheng Li, Xuejun Zou, Xiaodong Zhang

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引用次数: 0

摘要

本文首先采用水热法合成MIL-125样品。然后，通过硝酸银的光解作用将Ag掺杂到MIL-125样品表面。最后，通过定向液体组装法合成了z型MIL-125/Ag/BiOBr复合材料。通过x射线衍射、扫描电镜、高分辨率透射电镜、能量色散x射线光谱作图、傅里叶变换红外光谱、x射线光电子能谱、N2吸附-解吸分析、紫外-可见光谱、光致发光光谱、表面光电压分析、瞬态光电流响应分析、电化学阻抗谱和电子自旋共振分析。光催化实验表明，在pH = 6时，MIL-125/Ag/BiOBr异质结的光催化Cr6+还原效率为85.7%，分别是单独使用BiOBr和MIL-125的5.5倍和2.2倍。这是由于MIL-125与BiOBr之间的密切界面接触和Ag的掺杂，增加了光生载流子的转移和分离，抑制了电子和空穴的复合。进一步探讨了z型MIL-125/Ag/BiOBr光催化剂可能的光催化还原Cr6+机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Fabrication of Z-Scheme MIL-125/Ag/BiOBr Heterojunctions with Enhanced Photocatalytic Reduction of Cr6+

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Fabrication of Z-Scheme MIL-125/Ag/BiOBr Heterojunctions with Enhanced Photocatalytic Reduction of Cr6+

Herein, first, MIL-125 samples were synthesized via a hydrothermal method. Then, Ag species were doping on the surface of MIL-125 samples via the photolysis of silver nitrate. Finally, the Z-scheme MIL-125/Ag/BiOBr composite was synthesized via a directed liquid assembly method. The structure, morphology, and optical properties of the prepared samples were investigated via X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopic mapping, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, N₂ adsorption–desorption analysis, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, surface photovoltage analysis, transient photocurrent response analysis, electrochemical impedance spectroscopy, and electron spin resonance analysis. Photocatalytic experiments indicated that the photocatalytic Cr⁶⁺ reduction efficiency of MIL-125/Ag/BiOBr heterojunctions was 85.7% at pH = 6, which was approximately 5.5 and 2.2 times higher than that using BiOBr and MIL-125 alone, respectively. This performance was attributed to the intimate interfacial contact between MIL-125 and BiOBr and the doping of Ag species, which increased the transfer and separation of photogenerated carriers and inhibited the recombination of electrons and holes. Furthermore, the possible photocatalytic Cr⁶⁺ reduction mechanism of the Z-scheme MIL-125/Ag/BiOBr photocatalyst was proposed.

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).