Preparation of magnetic multi-walled carbon nanotubes for extraction and preconcentration of thallium from real samples and determination by electrothermal atomic absorption spectroscopy

Abstract

In this study, magnetic multi walled carbon nanotubes were prepared by Dicyclohexyl-18-crown-6 ligand for preconcentration of trace amount of Thallium ions. The optimum pH for maximum absorption of Thallium was between 6-7. Maximum absorption capacity was 39.5 mg of Thallium per gram of adsorbent and the breakthrough volume is 400 mL. Detection limits was 4.67 ng L-1 and the relative standard deviation was found to be 2.9%. Linearity was within the range of 0.024–0.668 µg L-1 with good correlation coefficient (0.998). In this study FT-IR analysis technique and SEM image was performed on nanoparticles. This method is simple, selective and sensitive, and can be applied to the determination of Thallium in various samples.

Keywords

• multi-walled carbon nanotubes
• magnetic nanoparticles
• magnetic solid phase extraction
• thallium