Abstract
ABSTRACTChemical methods for extraction and refinement of technologically critical rare earth elements (REEs) are energy intensive, hazardous, and environmentally destructive. Current bio-based extraction systems rely on extremophilic organisms and generate many of the same detrimental effects as chemical methodologies. The mesophilic methylotrophic bacteriumMethylobacterium extorquensAM1 was previously shown to grow using electronic waste by naturally acquiring REEs to power methanol metabolism. Here we show that growth using electronic waste as a sole REE source is scalable up to 10 L with consistent metal yields, without the use of harsh acids or high temperatures. Addition of organic acids increases REE leaching in a nonspecific manner. REE-specific bioleaching can be engineered through the overproduction of REE-binding ligands (called lanthanophores) and pyrroloquinoline quinone. REE bioaccumulation increases with leachate concentration and is highly specific. REEs are stored intracellularly in polyphosphate granules, and genetic engineering to eliminate exopolyphosphatase activity increases metal accumulation, confirming the link between phosphate metabolism and biological REE use. Finally, we report the innate ability ofM. extorquensto grow using other complex REE sources including pulverized smart phones, demonstrating the flexibility and potential for use as a recovery platform for these critical metals.
Publisher
Cold Spring Harbor Laboratory
Reference68 articles.
1. Summaries. United States Geological Survey. p 202. URL: Https: mineralsusgsgov/minerals/pubs/mcs/2016 2016.
2. Evaluating Rare Earth Element Availability: A Case with Revolutionary Demand from Clean Technologies
3. Kingsnorth. Meeting the challenges of rare earths supply in the next decade. Industrial Minerals Company of Australia Pty Ltd, The 2010.
4. Recycling of rare earths: a critical review
5. On the materials basis of modern society
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