Preparation of iron‐based MIL‐101 functionalized polydopamine@Fe₃O₄ magnetic composites for extracting sulfonylurea herbicides from environmental water and vegetable samples

Abstract

Here, we describe a simple one-pot solvothermal method for synthesizing MIL-101(Fe)@polydopamine@Fe O composites from polydopamine-modified Fe O particles. The composite was used as a magnetic adsorbent to rapidly extract sulfonylurea herbicides. The herbicides were then analyzed by high-performance liquid chromatography. The best possible extraction efficiencies were achieved by optimizing the most important extraction parameters, including desorption conditions, extraction time, adsorbent dose, salt concentration, and the pH of the solution. Good linearity was found (correlation coefficients >0.9991) over the herbicide concentration range 1-150 μg/L using the optimal conditions. The limits of detection (the concentrations giving signal/noise ratios of 3) were low, at 0.12-0.34 μg/L, and repeatability was good (the relative standard deviations were <4.8%, n = 6). The method was used successfully to determine four sulfonylurea herbicides in environmental water and vegetable samples, giving satisfactory recoveries of 87.1-108.9%. The extraction efficiency achieved using MIL-101(Fe)@polydopamine@Fe O was compared with the extraction efficiencies achieved using other magnetic composites (polydopamine@Fe O , Hong Kong University of Science and Technology (HKUST)-1@polydopamine@Fe O , and MIL-100(Fe)@polydopamine@Fe O ). The results showed that the magnetic MIL-101(Fe)@polydopamine@Fe O composites have great potential for the extraction of trace sulfonylurea herbicides from various sample types.

Ag/AgCl/MIL-101(Fe) Catalyzed Degradation of Methylene Blue under Visible Light Irradation

“…The band at 756 cm −1 is characteristic of benzene rings, attributing to the C-H bending vibration. The band at 542 cm −1 is ascribed to the stretching vibration of Fe–O band in MIL-101(Fe) framework [33]. In the Ag/AgCl/ MIL-101(Fe), the absorption peaks at 1602, 1393, 756 and 542 cm −1 are the characteristic absorptions of MIL-101(Fe), while the peak around 668 cm −1 is the typical AgCl absorption peak, which is evidence the presence of AgCl on the surface of the MIL-101(Fe).…”

Fe3O4@MOF Magnetic Nanocomposites: Synthesis and Applications

“…Another time in 2018, Deng and co‐workers used MSPE to extract sulfonylurea herbicides (SUHs) from environmental water and vegetable samples . To that end, they synthesized magnetic MIL‐101(Fe)@PDA@Fe 3 O 4 composite to collect SUHs from environmental water and vegetable samples.…”

Metal–organic framework for the extraction and detection of pesticides from food commodities

“…Finally, an efficient MSPE method was established. This was combined with HPLC for the pretreatment and determination of sulfonylurea herbicides (Deng et al., 2018). Additionally, MIL‐101(Cr)‐based composites were utilized for the extraction of pyrethroids from tea samples (Lu, He, Wang, Liu, & Hou, 2018).…”