Photo-thermal synergistic excitation: Feasible strategy to detect ethanol for wide bandgap ZIF-8 at low work temperature

IF 6.9 Q1 Environmental Science

Journal of environmental sciences Pub Date : 2024-04-01 Epub Date: 2023-03-10 DOI:10.1016/j.jes.2023.02.056

Shuhao Shi , Qian Du , Ming Hou , Xiaolei Ye , Li Yang , Shenghui Guo , Jianhong Yi , Ullah Ehsan , Hongbo Zeng

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引用次数: 1

Abstract

Zeolitic Imidazolate Framework-8 (ZIF-8) material was prepared by chemical precipitation method. The microstructure and physical properties of the as-prepared samples were characterized by XRD, BET, FESEM and UV spectrophotometer. The self-made four-channel measurement device was used to test the gas sensitivity of ZIF-8 material toward ethanol gas under photo-thermal synergistic excitation. The results showed that the sample was typical ZIF-8 (E_g = 4.96 eV) with a regular dodecahedron shape and the specific surface is up to 1793 m²/g. The as-prepared ZIF-8 has a gas response value of 55.04 to 100 ppm ethanol at 75 °C and it shows good gas sensing selectivity and repeated stability. The excellent gas sensitivity can be attributed to the increase of free electron concentration in the ZIF-8 conduction band by photo-thermal synergistic excitation, and the large specific surface area of ZIF-8 material provides more active sites for gas-solid surface reaction. The reaction mechanism of ZIF-8 material under multi-field excitation was also discussed.

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光热协同激发：在低工作温度下检测宽带隙ZIF-8乙醇的可行策略

采用化学沉淀法制备了沸石咪唑骨架-8（ZIF-8）材料。用XRD、BET、FESEM和紫外分光光度计对制备的样品的微观结构和物理性能进行了表征。采用自制的四通道测量装置，测试了ZIF-8材料在光热协同激发下对乙醇气体的气敏性。结果表明，样品是典型的ZIF-8（Eg=4.96eV），具有规则的十二面体形状，比表面积高达1793m2/g。所制备的ZIF-8在75°C下对100 ppm乙醇的气体响应值为55.04，并且显示出良好的气敏选择性和重复稳定性。优异的气敏性可归因于通过光热协同激发提高了ZIF-8导带中的自由电子浓度，ZIF-8材料的大比表面积为气固表面反应提供了更多的活性位点。讨论了ZIF-8材料在多场激发下的反应机理。

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来源期刊

Journal of environmental sciences Environmental Science (General)

CiteScore

12.80

自引率

0.00%

发文量

审稿时长

17 days

期刊介绍： Journal of Environmental Sciences is an international peer-reviewed journal established in 1989. It is sponsored by the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, and it is jointly published by Elsevier and Science Press. It aims to foster interdisciplinary communication and promote understanding of significant environmental issues. The journal seeks to publish significant and novel research on the fate and behaviour of emerging contaminants, human impact on the environment, human exposure to environmental contaminants and their health effects, and environmental remediation and management. Original research articles, critical reviews, highlights, and perspectives of high quality are published both in print and online.