Cleaning Up Oil Using Magnets

In future, it could be possible to remove oil spills on the surface of the ocean by using magnets. An interdisciplinary group of researchers at the Friedrich-Alexander Universität Erlangen-Nürnberg (FAU) in Germany, led by Prof. Dr. Marcus Halik has developed functionalised iron oxide particles that can attract any types of hydrocarbons. The magnetic particles and their shells can then be removed from the water relatively simply and in an environmentally-friendly manner and can even be reused after being cleaned.

The researchers have now published their study in the  journal Advanced Functional  Materials. In the study, they describe how functionalised iron oxide particles can be modified with a self-assembled monolayer so that they only adsorb hydrocarbons. This group of chemical substances includes light compounds such as alkanes and aromates but also crude oil, petrol and diesel. Such hydrocarbon molecules surround the very fine particles as if they are being sucked in and reach a volume that can grow to 14 times the size of the core of the particle.

Diagram of the process developed by materials scientists at FAU

A video on the researchers’ website shows how iron oxide powder is applied to liquid oil and the instant transformation into a substance that can be removed by a magnet. Iron oxide is a magnetic substance by nature.

In addition to the multiple reusability of the source material, the large surface to volume ratio provided by nanoparticles and the favourable ratio to the quantity of the hydrocarbons to be adsorbed all contribute to the very high efficiency of the process. In addition, it allows water to be completely cleaned of oil and oil products. Conventional methods, on the other hand, create dispersions or mixtures of substances that enable the hydrocarbons to be more easily digested by bacteria, but remain in the seawater until this process is complete.

Source: https://eam.fau.de/

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