Journal
CHEMICAL ENGINEERING JOURNAL
Volume 453, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.139743
Keywords
Covalent organic frameworks; Solid phase microextraction; Modulator; Polybrominated biphenyl
Categories
Ask authors/readers for more resources
Controllable construction of covalent organic frameworks (COFs) using 2,5-dimethoxybenzaldehyde (DB) as a modulator enhances the specific surface area and hydrophobicity of the COFs. These DB-modulated COFs, fabricated as solid phase microextraction (SPME) coatings, demonstrate outstanding enrichment factors for polybrominated biphenyls (PBBs) and enable precise quantification of ultra-trace PBBs in environmental aqueous samples using GC-MS.
Controllable construction of covalent organic frameworks (COFs) is fascinating, and full elucidations on the relationships between their microstructures and adsorption performance for persistent organic pollutants (POPs) are imperative and desirable, yet challenging. Herein, the 2,5-dimethoxybenzaldehyde (DB) has been first employed as a modulator to construct COFs with higher specific surface area and enhanced hydrophobicity under the mild conditions, after competing with the building blocks of 2,5-dimethoxyterephaldehyde (DMTP) and 1,3,5-tris(4-aminophenyl)benzene (TAPB). These TAPB-DMTP-DB COFs have been further fabricated as solid phase microextraction (SPME) coatings with uniform morphology and comparative thickness, to investigate their enrichment capacities for POPs systematically. In particular, the DB-modulated COF demonstrated outstanding enrichment factors (4400-11360) for polybrominated biphenyls (PBBs). Moreover, ultrasensitive analytical method has been developed based on the DB-modulated COF-coated fiber and gas chromatography-mass spec-trometry (GC-MS), with low limits of detection (0.04-0.28 ng/L), wide linear range (0.25-5000 ng/L), and satisfactory reproducibility, realizing the precise quantifications of ultra-trace PBBs in environmental aqueous samples.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available