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

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

doi:10.1016/j.jes.2023.02.056

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

J Environ Sci (China). 2024 Apr:138:112-120. doi: 10.1016/j.jes.2023.02.056. Epub 2023 Mar 10.

Authors

Shuhao Shi¹, Qian Du¹, Ming Hou¹, Xiaolei Ye², Li Yang³, Shenghui Guo¹, Jianhong Yi⁴, Ullah Ehsan¹, Hongbo Zeng⁵

Affiliations

¹ State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China.
² FEMTO -ST Institute (UMR CNRS 6174), Université de Bourgogne Franche-Comté (UBFC), Université de technologie de Belfort Montbéliard (UTBM), Site de Montbéliard, Belfort F-90010, France. Electronic address: xiaolei.ye@utbm.fr.
³ State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; Department of Chemical and Materials Engineering, University of Alberta, Edmonton T6G 2V4, Canada. Electronic address: yanglikmust@163.com.
⁴ Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China.
⁵ Department of Chemical and Materials Engineering, University of Alberta, Edmonton T6G 2V4, Canada.

PMID: 38135380
DOI: 10.1016/j.jes.2023.02.056

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.

Keywords: Gas-sensitive property; Photo-thermal synergistic excitation; Photon-generated electron and hole; UV-light irradiation; ZIF-8 material.

MeSH terms

Cold Temperature
Imidazoles*
Temperature
Zeolites* / chemistry

Substances

Imidazoles
Zeolites