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Fionn Miguel Eckardt Ferreira (from Ballydehob, County Cork, Ireland) is an Irish inventor, chemistry student and Forbes 30 under 30 listee. He is known for his invention of a method to remove Microplastics particles from water using a natural ferrofluid mixture.
Ferreira spent part of his childhood kayaking around remote coastal areas of Ireland with his dog India, noticing an increasing amount of plastic washing up on the coastline. He created a methodology to quantify and collect plastic pollution, with a focus on microplastics. He built several inventions using Lego, bits of wood and some microcontrollers to test for these microplastics. He entered the national science fair, the BT Young Scientist and Technology Exhibition, three times, with two of his projects being Let Sanils do the cleaning, An investigation into the antioxidant concentration of different berries using the Briggs-Rauscher reaction in conjunction with a photometer and An investigation into the removal of microplastics from water using ferrofluids. Ferreira worked as a curator at Schull's planetarium.
After hundreds of experiments and refinements, Ferreira developed a working prototype with microplastic extraction rates of up to 87% (+/- 1.1%), with the highest efficiency recorded for polyester-based particles. His approach specifically targets microplastics that conventional filtration systems struggle to remove, particularly very small particles.
He first exhibited the project at the 2018 Young Scientist and Technology Exhibition in Ireland, where he received the Intel Award, Best in Category, the Intellectual Ventures Award, and a first-place prize.
Later that year, he competed at the Intel International Science and Engineering Fair (ISEF) 2018, receiving the 1st place American Chemical Society award, 2nd place in Chemistry, and additional honors.
In 2019, Ferreira showcased an improved version at the Google Science Fair, winning the Grand Prize of $50,000 for his innovation.
Following these successes, Ferreira co-founded Fionn & Co., collaborating with the Green Journey Coalition to scale up the technology. Together, they have developed a **continuous flow prototype** capable of processing contaminated water in real time, a critical advancement toward industrial and municipal deployment. Unlike earlier batch methods, this system operates continuously, making it more efficient and suitable for integration into wastewater treatment plants.
As of 2025, Fionn & Co. and the Green Journey Coalition are actively raising funds to develop a **full-scale commercial prototype**. Their goal is to deploy the technology globally, targeting both municipal wastewater facilities and coastal remediation projects.
Ferreira has emphasized that the focus is not just on extraction efficiency but also on sustainability, ensuring the system uses minimal energy, is made from recycled materials where possible, and can be deployed globally at accessible cost.
His work remains central to international efforts to integrate microplastic removal into sustainable water systems and promote broader ocean health initiatives.
He is currently pursuing an MSc in Chemistry at the University of Groningen. As part of his master's studies, Ferreira conducted a research project in the molecular inorganic chemistry group of Professor Edwin Otten, focusing NMR for organic Redox Flow Batteries.
In 2023, he participated in a field-based project in Arctic chemical oceanography at the University Centre in Svalbard (UNIS), investigating the biogeochemical processes influencing plastic degradation and pollutant transport in polar marine environments.
In 2025, Ferreira began a second MSc research project at ETH Zurich, working in the laboratory of Professor Alexander Barnes. His work focuses on the development of high-temperature superconducting (HTS) magnets for nuclear magnetic resonance (NMR), with an emphasis on sustainable instrumentation and improving energy efficiency in scientific research.
In 2021, he was named a National Geographic Society Young Explorer; he has since been working on a new platform for youth in the space of invention with the help of funding from the society.
That same year, he was included in the Forbes 30 Under 30 list in the Science and Healthcare category.
In September 2021, Ferreira received the Premio Internazionale Giuseppe Sciacca award for his conservation and ecological efforts.
Ferreira has spoken at several international forums, including:
Ferreira has received several awards and recognitions:
The series blends interactive demonstrations, storytelling, and guest appearances by scientists and changemakers to highlight the power of youth innovation and science communication. It was well received for its accessible approach to complex topics and its positive representation of young scientists.
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