Green magnetic snail shell hydroxyapatite sorbent for reliable solid‐phase extraction of pesticides from water samples

Abstract

To address sustainability issues, the green synthesis of nanomaterials has recently received considerable attention. This article addresses a novel and cost‐effective adsorbent for the extraction of eight phenyl‐N‐methylcarbamate insecticides from water samples. We first synthesized a magnetite/hydroxyapatite nanocomposite using snail shell powder via an environmental friendly approach. The morphology and physicochemical properties of magnetic hydroxyapatite were characterized by Fourier transform infrared spectroscopy, energy‐dispersive X‐ray spectroscopy, and scanning electron microscopy. Magnetic extraction parameters were optimized using a Doehlert matrix. Under optimum conditions, the magnetic extraction coupled with a LC–MS method shows good linearity with R2 ≥ 0.9982, suitable intra‐ and interday precision, and limits of detection and quantification in the range of 0.052–0.093 μg/L and 0.11–0.31 μg/L, respectively. Satisfactory relative recoveries of all carbamates were achieved from fortified water samples in the range of 93.89–101.01%.

The potential of lignocellulosic biomass for magnetic solid phase extraction of naproxen from saliva samples

“…To prepare the magnetized biochars, 0.3 g of each biochar powder was mixed with 1 g of FeCl 3 ·6H 2 O according to our previous work. 18,21 The resulting mixture was then combined with 50 mL of ethylene glycol and 3 g of sodium acetate, stirred for 10 minutes, and autoclaved at 200 °C for 16 hours. Following autoclaving, the samples were washed with distilled water and dried at 60 °C for 2 hours.…”

“…16 MSPE, based on the use of a magnetic sorbent, is a better alternative approach that can facilitate the separation of a powder material with an external magnet, eliminating filtration and centrifugation steps and thus providing the advantage of easy operation. 7,17–23 In the field of magnetic solid phase extraction (MSPE), magnetic biochar has emerged as a valuable tool. This innovative material combines the adsorption capabilities of biochar with the magnetic properties that facilitate separation and regeneration processes.…”