High-performance gaseous aniline monitoring with selectivity against BTEX through the ligand functionalized zirconium metal-organic framework

•The functionalized UIO-66 was first used in aniline sensing application.•The detection limit was as low as 1 ppm.•This aniline sensing material had excellent selectivity against BTEX.•The acidic group on the ligand promoted the aniline sensing. A strategy for functionalizing zirconium metal-organic...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2022-01, Vol.333, p.113296, Article 113296
Main Authors: Wang, Luyu, Wu, Yunling, Pan, Zeping, Yu, Chunyang
Format: Article
Language:English
Subjects:
Aniline
BTEX
Ethylbenzene
Functional groups
Gas sensor
Ligands
Metal-organic framework
Metal-organic frameworks
Molecular structure
Molecules
Monitoring
Monitoring systems
Selective monitoring
Selectivity
Sensors
Toluene
Xylene
Zirconium
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Summary:•The functionalized UIO-66 was first used in aniline sensing application.•The detection limit was as low as 1 ppm.•This aniline sensing material had excellent selectivity against BTEX.•The acidic group on the ligand promoted the aniline sensing. A strategy for functionalizing zirconium metal-organic frameworks is proposed to design sensing materials for detecting aniline vapor firstly.Compared with UIO-66, the prepared 1,2,4-triazole functionalized UIO-66 shows enhanced aniline-sensing performance on its response behavior,especially its selectivity against BTEX vapor. [Display omitted] The selective monitoring of gaseous aniline from BTEX, including benzene, toluene, ethylbenzene, and xylene, is challenging because of their similar molecule structure and size. Now a family of zirconium metal-organic framework (MOF), UIO-66, with functionalized ligand is presented. By virtue of the acidity of 1,2,4-triazole functional group, the synthesized UIO-66-L2 shows excellent selectivity for aniline (4.1 Hz/1 ppm) over BTEX (less than 1.8 Hz/1 ppm). The desirable sensitivity, stability, and selectivity comprehensively demonstrate that the ligand functionalization strategy is an attractive method to design MOFs with dual functionality for challenging gas selective monitoring. This work creatively realizes the anti BTEX ability in the process of aniline detection, but it is still a challenge to enhance the detection limit to ppb concentration level.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2021.113296