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Porous 3D Printed Scavenger Filters for Selective Recovery of Precious Metals from Electronic Waste
Author(s) -
Lahtinen Elmeri,
Hänninen Mikko M.,
Kinnunen Kimmo,
Tuon Heikki M.,
Väisänen Ari,
Rissanen Kari,
Haukka Matti
Publication year - 2018
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.201800048
Subject(s) - scavenger , leachate , nitric acid , aqueous solution , chemistry , porosity , materials science , ion exchange , thiourea , metal ions in aqueous solution , metal , inorganic chemistry , ion , nuclear chemistry , chemical engineering , radical , organic chemistry , environmental chemistry , engineering
Selective laser sintering (SLS) 3D printing is used to fabricate highly macroporous ion scavenger filters for recovery of Pd and Pt from electronic waste. The scavengers are printed by using a mixture of polypropylene with 10 wt% of type‐1 anion exchange resin. Porosities and the flow‐through properties of the filters are controlled by adjusting the SLS printing parameters. The cylinder‐shaped filters are used in selective recovery of Pd and Pt from acidic leachate of electronic waste simply by passing the solution through the object. Under such conditions, the scavenger filters are able to capture Pd and Pt as anionic complexes with high efficiency from a solution containing mixture of different metal ions. By using the Pd/Pt scavenger together with previously reported, highly selective nylon‐based Au scavenger, precious metals, i.e., Au, Pd, and Pt could all be recovered from the electronic waste leachate in a single flow‐through process. One of the main advantages of the printed scavengers is that all recovered metals can be easily extracted from the filters as separate fractions by using aqueous solutions of thiourea or diluted nitric acid. After removal of the captured metals, the scavengers are reusable without significant loss of their ion‐capturing performance.