Preparation and characterization of chitosan‐siloxane magnetic nanoparticles for the extraction of pesticides from water and determination by HPLC

Abstract

Novel chitosan‐siloxane functionalized magnetic nanoparticles including chitosan polydimethyl siloxane, chitosan octadecyl siloxane, and chitosan phenyl siloxane were prepared and characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and Zeta potential measurements. The particles were prepared from Fe3O4 functionalized by siloxane derivatives followed by coating with chitosan through a crosslinking mechanism. Infrared spectroscopy was used to confirm the reaction and conjugation between the three layers of the crosslinking chitosan, siloxane and magnetic nanoparticles. The nanoparticles were applied as effective sorbents for extraction of seven pesticides (abamectin, diazinon, fenamiphos, imidacloprid, lambda‐cyhalothrin, methomyl and thiophanate‐methyl) from water. The particles were used in a magnetic dispersive solid‐phase extraction technique and solid‐phase extraction cartridge. The pesticides were then quantified by using high‐performance liquid chromatography with limit of detection of 0.002–0.046 μg/mL, limit of quantification of 0.006–0.154 μg/mL and excellent linearity in the range of 0.0125–0.15 μg/mL with correlation coefficients (R2) higher than 0.999. The magnetic nanoparticles showed a high recovery efficiency compared to standard octadecylsilane (Sigma–Aldrich) for some pesticides. The results indicated that these methods achieved the rapid and simple extraction of small quantities of adsorbents and solvent with a high recovery rate.

Deep Eutectic Solvent Micro-Functionalized Graphene Assisted Dispersive Micro Solid-Phase Extraction of Pyrethroid Insecticides in Natural Products

“…The characteristics of developed method and the comparison of the amount of adsorbent, the type and amount of extraction solvent, extraction time, RSD (%) and LOD were listed in Table 5. It can be seen that the LODs of this method were lower than those achieved by SPE (Esteve-Turrillas et al, 2005), LLE-DLLME (Farajzadeh et al, 2014), and MDSPE (Badawy et al, 2018). In comparison with other methods, the amounts of adsorbent and extraction solvent were obviously reduced: only 1.5 μg/mL of DES-G and 100 μL of acetonitrile.…”

Development of a Solid-Phase Extraction (SPE) Cartridge Based on Chitosan-Metal Oxide Nanoparticles (Ch-MO NPs) for Extraction of Pesticides from Water and Determination by HPLC

“…Therefore, we completed this reaction in our study by crosslinking agent to cover the reactive functional groups (amino and hydroxyl). Recently, we prepared chitosan‐siloxane magnetic nanoparticles from Fe 3 O 4 functionalized by siloxane derivatives followed by coating with chitosan through a crosslinking mechanism using glutaraldehyde and epichlorohydrin [ 34 ].…”

“…The SPE cartridge was performed using a plastic syringe column of 0.9 cm diameter and 9 cm in length ( Figure 1 ). The column was filled up without gaps by compressing a frit on the bottom and then adding 0.25 g of each Ch-MO NPs and stopcock frit on the upper [ 34 ]. We compared these cartridges with the ODS (C18, Supelco) cartridge as it is the most common material used in extraction and clean-up of pesticide residues.…”

Preparation and application of magnetic chitosan in environmental remediation and other fields: A review

“…177 These techniques were applied for the removal of diazinon, abamectin, fenamiphos, imidaclopride, methomyl and thiophanate methyl from water using new chitosan siloxane functionalized magnetic nanoparticles (Ch-SiMNPs). 178 The capture of all pesticides was experimented in three stages using 50, 100 and 200 μg/ml dispersed in water and was found that increasing the content of Ch-Si MNPs, the pesticide percentage recovery also increased. Abamectin indicated greatest recovery among all the pesticides and imidacloprid showed the least.…”