Lead-filtering sponge (IMAGE) Northwestern University Caption Commercially available cellulose sponge coated in manganese-doped goethite nanoparticles Credit Caroline Harms/Northwestern University Usage Restrictions add credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.