Functionalized magnetic covalent organic framework nanocomposites for high‐efficiency adsorption of ethyl carbamate from liquor

Abstract

Ethyl carbamate (EC) is a kind of genotoxic and carcinogenic substance and potentially harmful to human health. In this study, simple and effective removal of EC from liquor samples by using the magnetic mesoporous adsorbent (Fe3O4@COFs) was investigated. Gas chromatography and triple quadrupole tandem mass spectrometry (GC‐MS/MS) was used to monitor the whole of adsorption process. The results showed that the adsorbent has high efficiency and fast adsorption capacity. Under the optimized adsorption parameters, pseudo‐first‐order and pseudo‐second‐order kinetic models were employed to reveal the underlying sorption mechanism. Results indicated that the adsorption of EC on Fe3O4@COFs is more consistent with the pseudo‐second‐order model. Furthermore, an effective method for the adsorption and detection of EC was successfully developed, which exhibited good linearity with R2 ranging from 0.9954 to 0.9998, satisfactory recoveries in the range of 86.9%–116.2%, and the relative standard deviations (RSD) was lower than 5.8%. Fe3O4@COFs showed good stability and excellent performance in removing EC from liquor samples. It is expected that the proposed magnetic COFs hold great promise for liquor sample pretreatment and be extended for application in other fields.

Facile Preparation of Magnetic COF-on-COF for Rapid Adsorption and Determination of Sulforaphane from Cruciferous Vegetables

“…Furthermore, the O 1s spectrum (Figure 4d) was centered at 533.5 and 531.4 eV, indicating the presence of C-O and C=O, respectively. In addition, the peaks at 724.8 and 711.3 eV from the deconvolution can be assigned to the Fe in Fe 2p 1/2 and Fe 2p 3/2 , respectively, and the peaks at 732.0 and 716.8 eV belong to the satellite peaks of Fe [18]. These results indicated that the construction of MB-COFs-4 was successful.…”

“…However, even after high-speed centrifugation, pure COFs are difficult to completely separate from the solution owing to their low density, resulting in a large mass loss of COFs and low extraction efficiency [17]. To solve this challenge and improve the functionality of COFs, magnetic COFs incorporating Fe-based magnetic cores have been gradually applied to the MSPE process, which eliminates the tedious centrifugation step and achieves the rapid and complete separation of COFs from the solution [18]. Nevertheless, most reported magnetic COFs are monolayer COFs, which interact with compounds mainly through weak interactions such as hydrogen bonding, hydrophobic interactions, π-π interactions, and van der Waals' forces, resulting in low resistance to interference and poor extraction selectivity and efficiency for some analytes [19].…”