Synthesis and Application of Novel Modified Magnetic Nanocomposite for Solid Phase Extraction of Thallium(I) Ions

Document Type: Research Paper

Authors

Young Researchers and Elite Club, Kerman Branch, Islamic Azad University, Kerman, Iran

Abstract

In this paper, magnetically multiwalled carbon nanotubes (MMWCNTs) nanocomposite modified by methyl-2-[2-(2-2-[2-(methoxycarbonyl) phenoxy] ethoxyethoxy) ethoxy] benzoate was applied for magnetic solid-phase extraction (MSPE) of thallium(I) ions. Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) spectrometry and vibrating sample magnetometer (VSM) were used to characterize the magnetic sorbent. The effects of as pH, sample volume, eluent, and interfering ions were studied. Under the optimized conditions, the preconcentration factor of 100 and the linear response over 3−280 µg L−1 were obtained. The detection limit of the suggested procedure (LOD, 3Sb/m) was found to be 0.59 µg L−1. The relative standard deviation for six replicate detection of 100 µg L−1 of Tl(I) was ±1.9%. Finally, the developed method was utilized for the determination of thallium(I) ions in different real samples with recoveries in the range of 96.9–102.2% for the spiked samples. The proposed MSPE method exhibited some advantages, such as simplicity, rapidity, high sensitivity and excellent precision. In addition, the mechanism of thallium extraction by modified nanocomposite was proposed.

Keywords


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