Tertiary amine-functionalized metal-organic frameworks for high adsorption of perfluoroalkyl and polyfluoroalkyl
Zhuoning Li1, Xiaoli Wang1, Leilei Wang2
1College of Environmental Science and Engineering, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Abstract:
Sensitive monitoring of per- and polyfluoroalkyl substances (PFASs) is critical for environmental and health risk assessment. In this work, metal-organic frameworks (MOFs) functionalized with positively charged tertiary amines (UiO-67-CH2-N(CH3)2) were synthesized by the one-pot route, which integrated solvothermal MOFs assembly and in-situ reductive amination of formyl groups. The fabricated UiO-67-CH2-N(CH3)2 exhibited exceptional performance as adsorbents for solid-phase extraction (SPE), and the efficient adsorption of PFASs was attribute to the electrostatic attraction and hydrogen bonding. The proposed SPE-HPLC-MS/MS method demonstrated low limit of detection (0.02-0.88 ng·L-1), good linearity (0.2-400 ng·L-1) and high precision (RSD < 8.18 %). The effectiveness of the established method was assessed through the analysis of PFASs in environmental waters, and recoveries in spiked samples were 84.0-117 % with RSD < 13 %. This study highlighted the efficacy of the functionalized UiO-67-CH2-N(CH3)2 in trace PFASs analysis, advancing their application in environmental monitoring.
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