Multishell fullerenes are commonly known as onion-like structures or carbon nano-onions (CNOs). CNOs consist of a hollow spherical fullerene core surrounded by larger concentric fullerene layers forming quasi-spherical multilayers. Although several synthetic methodologies exist, only a few allow for the production of large quantities. Pristine CNOs are insoluble in polar and nonpolar solvents. Thus their study is only possible after surface functionalization. For these reasons, in-depth research has been hindered, and much work is yet to be done on these materials. In the project herein, CNOs were utilized in the removal of organic molecules from water solutions. To this end, CNOs were synthesized by arc discharge underwater and magnetite nanoparticles were incorporated into its surface leading to a composite having magnetic properties. The study of the applicability of CNOs for environmental remediation consisted of the removal of a known compound from a water sample. In this experiment, food dye blue #1 was used as the target compound for removal. The experimental process consisted of using the carbon substrate (with and without magnetization) on a known solution of blue #1, and the mixture was allowed to sit overnight. After the adsorption time, the concentration of the blue #1 still on the solution was determined via UV-visible spectroscopy. The results of the study showed that the pristine CNOs material has a similar absorption to activated carbon substrates. The magnetite-CNOs composite was 35% less effective than the pristine CNOs. However, the composite holds the added value of the magnetic character making it easier to separate from the treated water sample. Results from the experiment show great potential for the CNOs' usage in chemical removal from water samples. Findings from the study contribute to the existing body of knowledge on environmental remediation of anthropogenic chemicals in the water supply, particularly of chemicals with known bioaccumulation potential (i.e., highly hydrophobic-lipophilic molecules).

Synthesis and surface modification of carbon nano-onions (CNOs) for environmental remediation applications

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.