A novel 4-(2-pyridylazo) resorcinol functionalised magnetic nanosorbent for selective extraction of Cu(II) and Pb(II) ions from food and water samples

Abstract

This paper describes a novel sorbent based on 4-(2-pyridylazo) resorcinol functionalised magnetic nanoparticles and its application for the extraction and pre-concentration of trace amounts of Cu(II) and Pb(II) ions. The nanosorbent was characterised by Fourier transform infrared spectroscopy, X-ray powder diffraction, thermal analysis, elemental analysis and scanning electron microscopy. The effects of various parameters such as pH, sorption time, sorbent dosage, elution time, volume and concentration of eluent were investigated. Following the sorption and elution of analytes, Cu(II) and Pb(II) ions were quantified by flame atomic absorption spectrometry. The limits of detection were 0.07 and 0.7 μg l(-1) for Cu(II) and Pb(II), respectively. The relative standard deviations of the method were less than 7%. The sorption capacity of this new sorbent were 92 and 78 mg g(-1) for Cu(II) and Pb(II), respectively. Finally this nanosorbent was applied to the rapid extraction of trace quantities of Cu(II) and Pb(II) ions in different real samples and satisfactory results were obtained.

Determination of Hg(II) ions in sea food samples after extraction and preconcentration by novel Fe3O4@SiO2@polythiophene magnetic nanocomposite

“…Silica is one of the most ideal shells due to its several unique merits: (a) silica shell prevents Fe 3 O 4 NPs from aggregation in wide pH ranges and improves their chemical stability, (b) silica surface is often terminated by silanol groups that can react with silane coupling agents in order to functionalize with a variety of specific ligands, and (c) the SiO 2 layers possess a good hydrophilicity behavior (Farimani et al 2014). According to the hard and soft acid and base theory (HSAB), soft acids like most of heavy metals react faster and form stronger bonds with ligands containing N and S moieties (Asgharinezhad et al 2014c).…”

Determination of mercury(II) ions in seafood samples after extraction and preconcentration by a novel functionalized magnetic metal–organic framework nanocomposite

“…In a typical reaction, 1.0 g of Fe 3 O 4 was suspended in 50 mL toluene, and the mixture was stirred for 45 min. Then 3‐choloro‐propyltriethoxysilane (1.0 mL) was added to the mixture and it was refluxed for 16 h under nitrogen atmosphere . The obtained solid was suspended in 100 mL of a mixture containing TEA/THF (1:1 v/v) and 4.0 g (excess amount) of DMcT was added.…”

Determination of Trace Amounts of Cd(II), Cu(II), and Ni(II) in Food Samples Using a Novel Functionalized Magnetic Nanosorbent

“…They were then allowed to stand at room temperature for the evaporation of the solvent; afterward, the equilibration between the analytes and the fruit samples was achieved. After grinding the dry fruit (spiked or nonspiked), microwave-assisted acid digestion was carried out by adding 2 mL of distilled water, 4 mL of nitric acid 65 %, and 2 mL of hydrogen peroxide 33 % (w/v) to 0.5 g of each sample (Asgharinezhad et al 2014b). The reactors were then subjected to the microwave program (2.5 min at room temperature, 6 min at 140°C, 5 min at 200°C in power of 550 W).…”