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Comparison of the performance of different modified graphene oxide nanosheets for the extraction of Pb(II) and Cd(II) from natural samples |
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| Authors: | Omid Sayar Kheirollah Mehrani Fatemeh Hoseinzadeh Azadeh Mehrani Omid Sadeghi |
| Affiliation: | 1. School of Civil & Environmental Engineering, University of New South Wales, Kensington, NSW, P.O. Box 2052, Australia 2. Department of Chemistry, Islamic Azad University, Science and Research Branch, P.O. Box 19395-1775, Tehran, Iran 3. Technical and Vocational University, Vanak Square, P.O. Box 14356-94537, Tehran, Iran 4. Department of Chemistry, Islamic Azad University, Shahr-e-Rey Branch, P.O. Box 18735-334, Tehran, Iran |
| Abstract: | Graphene nanosheets were modified with amino groups and the resulting material was used as a sorbent for the extraction of cadmium and lead ions. The nanosheets were characterized by IR spectroscopy, transmission electron microscopy, thermal gravimetric analysis and elemental analysis. The effects of sample pH, eluent parameters (type, concentration and volume of eluent), flow rates (of both sample and eluent), and of a variety of other ions on the efficiency of the extraction of Cd(II) and Pb(II) were optimized. Following solid phase extraction, the elements were determined by FAAS. The limits of detection are <0.9 μg L?1 for Pb(II) and <5 ng L?1 for Cd(II). The relative standard deviations are <2.2 %. The method was validated by analyzing several certified reference materials and was then used for Pb(II) and Cd(II) determination in natural waters and vegetables. In this work, grapheme oxide nanosheets were modified with amino and tri-amino groups and their application were investigated in Cd(II) and Pb(II) determination in food sample. The results show high preconcentration factor and adsorption capacities for these nanosheets. |
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