Abstract
Carbon nanomaterials (CNM) obtained by the catalytic pyrolysis of ethanol vapors are characterized with respect to their morphology, chemical purity, and sorption capacity. The efficacy of their usage to concentrate metal ions by sorption is demonstrated. The change in the sorption capacity of CNM in different treatments of materials is explained by the surface modification by the oxygen-containing functional groups and their destruction upon annealing. This is confirmed by chemical and thermogravimetric analysis methods. The optimal conditions to concentrate a series of metal ions from water solutions for determining further flame atomic adsorption are found. This allowed the reduction of the detection limits by one to two orders of magnitude. The correctness of the determination is confirmed by the method of additions and the analysis of standard samples.
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