Student's "Teabag" Beats Arsenic Pollution

A student-led innovation has yielded a novel approach to purifying drinking water from arsenic contamination. This groundbreaking "teabag," developed by a Minnesota student and further explored in peer-reviewed research, effectively removes over 98% of arsenic from laboratory solutions. The design incorporates readily available materials, including cellulose fabric, crushed eggshells, and magnetic iron oxide nanoparticles.

Initially recognized at the Minnesota State Science & Engineering Fair in March 2025, the project demonstrated significant potential. Subsequent research published in ACS Omega in March 2026 confirmed the efficacy of the teabag. The blend of materials, particularly the magnetic iron oxide and eggshell components, acts as potent adsorbents for arsenic, addressing a critical issue in areas with contaminated groundwater.

Researchers found that the most effective configuration of the teabag reduced arsenic levels by more than 98% in laboratory tests. Furthermore, the study indicated that the teabags could be reused up to five times, with a cost estimated at around seven US cents per unit, making it a potentially affordable solution for widespread use.