Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 2 de 2
Filter
Add more filters










Database
Language
Publication year range
1.
J Chromatogr A ; 1673: 463071, 2022 Jun 21.
Article in English | MEDLINE | ID: mdl-35500388

ABSTRACT

The wide utilization of organophosphorus pesticides (OPPs) results in a potential threat to ecosystem and human health. The essential extraction process in practical OPPs analysis always suffers from the low efficiency due to the limited accessible active sites and interactions in the adsorbents. Here, we report a rational design and synthesis of a novel hydroxyl-functionalized three-dimensional covalent organic framework (3D COF-OH) named JNU-6 with ordered porous structure and multiple interactions as the adsorbent for rapid and selective dispersive solid phase extraction (DSPE) of OPPs. The 3D COF-OH based DSPE was coupled with gas chromatography-flame thermionic detection (GC-FTD) for the determination of four selected OPPs with low limits of detection of 0.15-0.39 ng mL-1, wide linear range of 1-1100 ng mL-1. The developed method gave good precision (relative standard deviation of 1.6-8.5% (n = 5)) and recoveries of 86-106% for the determination of OPPs in complicated fruit and vegetable samples. This work reveals the high practical potential of functionalized 3D COFs as adsorbents for effective extraction of trace contaminants in complicated samples.


Subject(s)
Metal-Organic Frameworks , Pesticides , Ecosystem , Humans , Limit of Detection , Metal-Organic Frameworks/chemistry , Organophosphorus Compounds/analysis , Pesticides/analysis , Solid Phase Extraction/methods
2.
J Hazard Mater ; 427: 128156, 2022 Apr 05.
Article in English | MEDLINE | ID: mdl-34979389

ABSTRACT

Development of novel functionalized covalent organic frameworks (COFs) as adsorbent for removal of mercury from environment is of great significance, but the conventional strategies for functionalizing COFs always sacrifice porous properties and suppress the exposure of functional sites, which goes against the rapid adsorption of Hg(II). Here, we show the rational design and preparation of the first thiourea-linked COFs via engineering the COFs linkage as functional moiety for ultrafast and selective adsorption of Hg(II). Two thiourea-linked COFs JNU-3 and JNU-4 were prepared via tautomerism reaction of 1,3,5-triformylphloroglucinol with 1,4-phenylenebis(thiourea) and 1,4-biphenylenebis(thiourea), respectively. The thiourea serves as not only linkage to connect the building block into irreversible crystalline structure, but also functional moiety to give no occupation of the COF pore and full exposure to Hg(II) with strong affinity, offering the JNU-3 and JNU-4 large adsorption capacity (960 and 561 mg g-1, respectively) and ultrafast kinetics (equilibrium time of 10 s) for Hg(II). The proposed strategy for the design of functional COFs with inherent linkage as functional moiety largely promotes the performance of COFs for diverse applications.

SELECTION OF CITATIONS
SEARCH DETAIL
...