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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Elemental analysis using energy-dispersive X-ray spectroscopy and scanning electron microscopy images of hemp- and flax-based felts before (a,c) and after (b,d) adsorption of a solution containing a mixture of seven metals.